What are the cheapest airlines flying from Seattle to London round-trip?

Cheapflights users have booked flights from Seattle to London round-trip from $583. Other airlines that can offer you cheap pricing are Iberia, from $584, and Icelandair, from $585. Users have found that Aer Lingus is 28% cheaper than the other options available to this destination.

What are the cheapest airlines to fly from Seattle to London one-way?

One-way options have recently been found by users for as low as $278 on Icelandair. Other airlines that offer cheap prices include WestJet from $324 and Scandinavian Airlines from $391 one-way.

What are the most popular routes from Seattle to London?

When deciding which route to take from Seattle to London consider Seattle/Tacoma Intl - London Heathrow, Seattle/Tacoma Intl - London Gatwick or Seattle/Tacoma Intl - London City as they are the most popular.

What are the cheapest flights from Seattle to London?

Looking at all options, your cheapest flight can be booked for $409. While the most popular route (Seattle/Tacoma Intl - London Heathrow) can be booked for $545 on average our data indicates $1,703 when flying from Seattle to London.

What are the most reliable airlines from Seattle to London?

Consider Aeromexico (82%), Singapore Airlines (81%) or American Airlines (72%) when booking your flight. These represent the most reliable airlines when flying from Seattle to London.

What are the most popular airlines that fly from Seattle to London?

Before booking your flight from Seattle to London check out the most popular airlines for this route: American Airlines, Air Canada or Air France.

Where are the most common layover locations when flying from Seattle to London?

The most popular layover on flights from Seattle to London is Reykjavik.

Where are the least popular layover locations for Seattle to London flights?

Flights departing from Seattle and landing in London layover in Dublin least frequently.

What are some popular things to do or see while on a layover in Reykjavik?

Reykjavik travelers tend to visit Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool more than anywhere else. Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool are located about 23.2 mi, 23.3 mi, and 24.6 mi, respectively from Reykjavik Keflavik Intl. Travelers in need of a car in Reykjavik can rent one for about $54 per day.

What is the cheapest day to fly round-trip from Seattle to London?

Friday flights are found to be more expensive to fly from Seattle to London. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to London.

How far in advance should I book a flight from Seattle to London?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 47 days in advance, which can save you up to 47% on flights from Seattle to London compared to booking the week you need them. Waiting 47 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $899. For sooner than that we have options available in the next 3 days from $986.

What is the cheapest month to fly from Seattle to London?

January is one of the best times of the year to fly to London from Seattle. Prices for January average $820 per person but you can even find prices for as low as $500. The most expensive prices can be found in the month of June. Opting for a January flight can save you 46% on your journey compared to booking in June

Most accurate provider : When it comes to deals on Seattle-London flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-London flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-London flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Seattle-London flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly from for flights from Seattle to London?

If you book a flight to London from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 12 flights from Seattle/Tacoma Intl to London per day from 15 different airlines.

Can I find deals for flights from Seattle to London that include hotel bookings?

Yes. In addition to deals on Seattle to London flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Seattle to London?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to London.

Can I find deals for business class flights from Seattle to London?

Yes. Cheapflights offers flight deals from Seattle to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$273+ Flights from Seattle to London

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1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

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3. Compare prices and book

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The best prices from Seattle/Tacoma Intl to London are usually found in January or October, booked 46 days in advance, depart on a Tuesday or Monday and return on a Wednesday

Cheap flight deals from Seattle to London

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$583 (Mytrip)
One-way from	$273 (Norse)
Popular in	June
Cheapest in	January
Average price	$710
Good round-trip deal	$709 or less
Good one-way deal	$490 or less

Provider with most accurate pricing for Seattle/Tacoma Intl-London (LON) flight deals.

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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-London (LON) flights.

Search Deals

From Seattle/Tacoma Intl to London (LON)

Search Deals

One-way flight from Seattle/Tacoma Intl to London (LON)

Search Deals

Highest demand for flights based on searches. 21% potential increase in price ($228 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($36 potential savings vs. average RT price).

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Average for round-trip flights in February 2025

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Price to beat on a round-trip flight from Seattle/Tacoma Intl to London (LON).

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Price to beat on a one-way flight from Seattle/Tacoma Intl to London (LON).

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Find flight deals from Seattle to London

Cheapest flights from Seattle to London
Explore the most affordable flight options available from Seattle to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 25, 2025.

Tue 4/18:04 pmSEA - LGW

3 stops29h 56mMultiple Airlines

Tue 4/299:35 pmLGW - SEA

2 stops30h 53mMultiple Airlines

Deal found 2/25

$583

Tue 4/16:45 pmSEA - LHR

1 stop13h 10mAer Lingus

Tue 4/2912:00 pmLHR - SEA

1 stop12h 59mAer Lingus

Deal found 2/25

$583

Mon 3/311:30 pmSEA - LHR

Nonstop9h 20mIberia

Tue 4/89:25 amLHR - SEA

Nonstop9h 45mIberia

Deal found 2/25

$584

Tue 4/13:45 pmSEA - LGW

1 stop12h 00mIcelandair

Wed 4/303:40 pmLGW - SEA

1 stop13h 00mIcelandair

Deal found 2/25

$585

Mon 9/297:00 pmSEA - LHR

1 stop32h 55mIcelandair

Tue 10/149:25 pmLHR - SEA

1 stop28h 25mIcelandair

Deal found 2/25

$585

Tue 4/13:45 pmSEA - LHR

1 stop12h 10mMultiple Airlines

Wed 4/306:15 amLHR - SEA

2 stops22h 13mMultiple Airlines

Deal found 2/25

$592

Wed 3/263:35 pmSEA - STN

2 stops23h 40mMultiple Airlines

Wed 4/26:00 pmSTN - SEA

2 stops31h 50mMultiple Airlines

Deal found 2/24

$604

Mon 3/246:45 pmSEA - LHR

Nonstop9h 25mVirgin Atlantic

Tue 4/85:35 pmLHR - SEA

1 stop25h 40mVirgin Atlantic

Deal found 2/25

$606

Mon 3/243:05 pmSEA - LHR

1 stop12h 05mAir Canada

Tue 4/89:30 amLHR - SEA

2 stops16h 58mAir Canada

Deal found 2/25

$612

Wed 3/127:55 pmSEA - LHR

Nonstop9h 45mDelta

Tue 3/186:30 amLHR - SEA

1 stop13h 10mDelta

Deal found 2/25

$618

Fri 3/217:05 pmSEA - LHR

1 stop32h 05mUnited Airlines

Mon 3/319:30 amLHR - SEA

2 stops38h 28mUnited Airlines

Deal found 2/24

$619

Sun 4/208:20 pmSEA - LHR

Nonstop9h 20mBritish Airways

Tue 4/2911:30 amLHR - SEA

2 stops19h 39mBritish Airways

Deal found 2/25

$623

Best flights from Seattle to London
Discover carefully curated flight deals from Seattle to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 25, 2025.

Tue 4/18:04 pmSEA - LGW

3 stops29h 56mMultiple Airlines

Tue 4/299:35 pmLGW - SEA

2 stops30h 53mMultiple Airlines

Deal found 2/25

$583

Tue 4/16:45 pmSEA - LHR

1 stop13h 10mAer Lingus

Tue 4/2912:00 pmLHR - SEA

1 stop12h 59mAer Lingus

Deal found 2/25

$583

Mon 3/318:20 pmSEA - LHR

Nonstop9h 20mIberia

Tue 4/89:25 amLHR - SEA

Nonstop9h 45mIberia

Deal found 2/24

$584

Tue 4/13:45 pmSEA - LGW

1 stop12h 00mIcelandair

Wed 4/303:40 pmLGW - SEA

1 stop13h 00mIcelandair

Deal found 2/25

$585

Tue 4/291:30 pmSEA - LHR

Nonstop9h 20mFinnair

Wed 5/710:20 amLHR - SEA

1 stop13h 40mFinnair

Deal found 2/24

$595

Tue 4/293:05 pmSEA - LHR

1 stop14h 15mAir Canada

Wed 5/78:40 amLHR - SEA

2 stops18h 57mAir Canada

Deal found 2/24

$616

Wed 3/127:55 pmSEA - LHR

Nonstop9h 45mKLM

Thu 3/206:30 amLHR - SEA

1 stop13h 10mKLM

Deal found 2/23

$618

Fri 3/217:05 pmSEA - LHR

1 stop32h 05mUnited Airlines

Mon 3/319:30 amLHR - SEA

2 stops38h 28mUnited Airlines

Deal found 2/23

$619

Tue 4/158:20 pmSEA - LHR

Nonstop9h 55mDelta

Wed 4/2311:30 amLHR - SEA

1 stop14h 10mDelta

Deal found 2/25

$626

Thu 3/203:05 pmSEA - LHR

1 stop12h 05mLufthansa

Wed 3/266:30 amLHR - SEA

1 stop13h 40mLufthansa

Deal found 2/24

$633

Tue 3/1110:55 amSEA - LGW

2 stops23h 55mSWISS

Tue 3/186:45 pmLGW - SEA

2 stops35h 08mSWISS

Deal found 2/25

$657

Fri 4/255:35 pmSEA - LHR

Nonstop9h 50mVirgin Atlantic

Sun 4/278:40 amLHR - SEA

1 stop15h 20mVirgin Atlantic

Deal found 2/24

$661

Last-minute flights from Seattle to London
Discover last-minute flight deals from Seattle to London. Data last updated February 25, 2025 and is based on user searches.

Sun 3/28:00 pmSEA - LHR

1 stop12h 50mAer Lingus

Wed 3/1212:10 pmLHR - SEA

1 stop14h 05mAer Lingus

Deal found 2/25

$590

Sun 3/26:55 pmSEA - LHR

Nonstop9h 45mKLM

Wed 3/126:30 amLHR - SEA

1 stop13h 10mKLM

Deal found 2/25

$825

Mon 3/37:00 pmSEA - LGW

1 stop18h 30mTurkish Airlines

Tue 3/186:00 amLGW - SEA

1 stop19h 05mTurkish Airlines

Deal found 2/25

$658

Mon 3/36:50 pmSEA - LHR

Nonstop9h 25mIberia

Tue 3/189:25 amLHR - SEA

Nonstop9h 55mIberia

Deal found 2/25

$755

Tue 3/42:35 pmSEA - LHR

1 stop20h 55mIcelandair

Tue 3/118:40 pmLHR - SEA

1 stop28h 20mIcelandair

Deal found 2/25

$618

Tue 3/42:35 pmSEA - LGW

1 stop12h 20mIcelandair

Thu 3/1311:55 amLGW - SEA

1 stop13h 05mIcelandair

Deal found 2/23

$645

Tue 3/45:15 amSEA - LGW

1 stop21h 20mMultiple Airlines

Tue 3/1112:00 pmLGW - SEA

1 stop30h 46mMultiple Airlines

Deal found 2/25

$664

Tue 3/411:30 amSEA - LHR

2 stops17h 20mWestJet

Tue 3/112:50 pmLHR - SEA

1 stop30h 31mWestJet

Deal found 2/25

$722

Tue 3/46:50 pmSEA - LHR

Nonstop9h 25mFinnair

Tue 3/113:00 pmLHR - SEA

Nonstop9h 55mFinnair

Deal found 2/25

$836

Wed 3/57:00 pmSEA - LHR

1 stop19h 25mTurkish Airlines

Tue 3/1810:35 pmLHR - SEA

1 stop26h 30mTurkish Airlines

Deal found 2/25

$744

Wed 3/53:15 pmSEA - LHR

1 stop13h 35mMultiple Airlines

Wed 3/127:30 amLHR - SEA

2 stops34h 10mMultiple Airlines

Deal found 2/25

$779

Fri 3/72:35 pmSEA - STN

2 stops25h 05mMultiple Airlines

Tue 3/114:20 pmSTN - SEA

2 stops32h 40mMultiple Airlines

Deal found 2/25

$823

One-way flights from Seattle to London
Search for one-way flight options from Seattle to London. Find affordable one-way fares based on user searches. Data last updated February 25, 2025.

Wed 4/29:37 pmSEA - LGW

1 stop24h 43mMultiple Airlines

Deal found 2/25

$273

Mon 4/283:45 pmSEA - LGW

1 stop14h 55mIcelandair

Deal found 2/24

$278

Mon 4/283:45 pmSEA - LHR

1 stop20h 35mIcelandair

Deal found 2/24

$278

Mon 3/247:05 pmSEA - LHR

2 stops34h 45mMultiple Airlines

Deal found 2/25

$311

Sun 3/2311:30 pmSEA - STN

2 stops27h 30mMultiple Airlines

Deal found 2/24

$322

Fri 3/711:30 amSEA - LHR

3 stops41h 20mWestJet

Deal found 2/24

$324

Mon 6/97:05 amSEA - LTN

2 stops24h 55mMultiple Airlines

Deal found 2/25

$359

Mon 5/264:00 pmSEA - LHR

1 stop17h 40mScandinavian Airlines

Deal found 2/24

$391

Wed 4/28:20 pmSEA - LHR

Nonstop9h 55mVirgin Atlantic

Deal found 2/24

$410

Tue 4/298:20 pmSEA - LHR

Nonstop9h 20mBritish Airways

Deal found 2/24

$412

Mon 3/249:00 pmSEA - LHR

1 stop11h 35mAer Lingus

Deal found 2/23

$415

Wed 3/263:05 pmSEA - LHR

1 stop12h 05mUnited Airlines

Deal found 2/23

$418

Find flights from Seattle to London within your budget

Fly from

Fly to

Route

Depart

Return

Price

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 4/1

8:04 pm-10:00 am

3 stops29h 56m

London Gatwick

Tue 4/29

9:35 pm-8:28 pm

2 stops30h 53m

$583

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 4/1

6:45 pm-3:55 pm

1 stop13h 10m

London Heathrow

Tue 4/29

12:00 pm-4:59 pm

1 stop12h 59m

$583

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 3/31

1:30 pm-6:50 am

Nonstop9h 20m

London Heathrow

Tue 4/8

9:25 am-11:10 am

Nonstop9h 45m

$584

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 4/1

3:45 pm-11:45 am

1 stop12h 00m

London Gatwick

Wed 4/30

3:40 pm-8:40 pm

1 stop13h 00m

$585

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 4/1

3:45 pm-11:55 am

1 stop12h 10m

London Heathrow

Tue 4/29

9:25 pm-8:40 pm

1 stop31h 15m

$586

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 3/26

3:35 pm-10:15 pm

2 stops23h 40m

London Stansted

Wed 4/2

6:00 pm-5:50 pm

2 stops31h 50m

$604

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 3/24

6:45 pm-11:10 am

Nonstop9h 25m

London Heathrow

Tue 4/8

5:35 pm-11:15 am

1 stop25h 40m

$606

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 4/15

3:45 pm-11:55 am

1 stop12h 10m

London Heathrow

Wed 5/7

6:15 am-8:28 pm

2 stops22h 13m

$611

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 3/24

3:05 pm-10:10 am

1 stop12h 05m

London Heathrow

Tue 4/8

9:30 am-6:28 pm

2 stops16h 58m

$612

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 3/12

7:55 pm-12:40 pm

Nonstop9h 45m

London Heathrow

Wed 3/19

6:30 am-12:40 pm

1 stop13h 10m

$618

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/24

Showing 1-10 of 60 results

...

Compare providers for flights from Seattle to London

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to London in February.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 stars
Gotogate	Price Accuracy3 stars	Trust Score*3 stars
oojo	Price Accuracy3 stars	Trust Score*2 stars
Ovago	Price Accuracy3 stars	Trust Score*3 stars
Mytrip	Price Accuracy3 stars	Trust Score*3 stars
CheapTicketsDeal	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Seattle-London flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-London flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-London flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Seattle-London flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

The best insider tips for Seattle to London flights

Find out what our experts recommend to make the most of your Seattle to London trip

Airlines

Delta

Delta One offers 180-degree flat-bed seats and premium food and drinks.

Comfort Plus provides extra legroom and complimentary alcoholic drinks.

British Airways

Club Suite offers solo pods with a door for privacy on most 777s.

World Traveller Plus provides extra seat width and legroom, ideal for pairs.

Read more about British Airwaysby Gabriel Leigh

Virgin Atlantic

Upper Class offers lie-flat beds and a four-course meal with pre-order option.

Economy Delight includes priority boarding and extra legroom for taller travelers.

Read more about Virgin Atlanticby Blane Bachelor

Icelandair

Saga Premium includes noise-cancelling headphones and generous legroom.

Economy Light allows carry-on only with optional seat selection for savings.

Iberia

Business class features lay-flat beds with adjustable pillows and massage function.

Premium Economy offers 37 inches of legroom and noise-canceling headphones.

American Airlines

Flagship First offers 21.8” wide seats with a work desk and fully flat bed.

Flagship Business class provides direct aisle access and a 6’ 7” lay-flat bed.

Read more about American Airlinesby Marisa Garcia

Our travel experts

Harriet Baskas

Expert on Delta

Gabriel Leigh

Expert on British Airways

Blane Bachelor

Expert on Virgin Atlantic

Bill Fink

Expert on Icelandair

Emily Zemler

Expert on Iberia

Marisa Garcia

Expert on American Airlines

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.

Best time to book a flight from Seattle to London

Have a flexible travel schedule? Discover the best time to fly to London from Seattle with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Seattle to London

Get recent, data-driven insights about flights from Seattle to London including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Seattle to London?

Booking 46 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to London. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Seattle to London?

Currently, November is the cheapest month in which you can book a flight from Seattle to London (average of $661). Flying from Seattle to London in June is currently the most expensive (average of $1,136). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to LON?

One of the essential ways to save on airfare from Seattle to London is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the afternoon could potentially save you up to 9% on airfare.

What is the cheapest day to fly from Seattle to London?

Travelers seeking maximum savings on their Seattle to London flight should consider departing on Tuesday evenings when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Seattle to London

The most flights from SEA to LON are scheduled on a Tuesday (18 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (11 on average).

Rainfall in London by month

In terms of precipitation, rainfall in London ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London when rainfall is around 1.6 in.

Temperature in London by month

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

Reviews of airlines servicing London

See what other customers who have flown with Delta, KLM and Finnair from Seattle to London have to say. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

8,163 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

8.0

Very good

8,163 reviews

Delta

8.0

Very good

8,163 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM

7.8

Good

1,332 reviews

Delta

8.0

Very good

8,163 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Finnair

7.6

Good

1,273 reviews

Delta

8.0

Very good

8,163 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

SWISS

7.5

Good

1,568 reviews

Delta

8.0

Very good

8,163 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Virgin Atlantic

7.5

Good

651 reviews

Delta

8.0

Very good

8,163 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

What airport do you fly from for flights from Seattle to London?
If you book a flight to London from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 12 flights from Seattle/Tacoma Intl to London per day from 15 different airlines.
What are the cheapest airlines flying from Seattle to London round-trip?
Cheapflights users have booked flights from Seattle to London round-trip from $583. Other airlines that can offer you cheap pricing are Iberia, from $584, and Icelandair, from $585. Users have found that Aer Lingus is 28% cheaper than the other options available to this destination.
What are the cheapest airlines to fly from Seattle to London one-way?
One-way options have recently been found by users for as low as $278 on Icelandair. Other airlines that offer cheap prices include WestJet from $324 and Scandinavian Airlines from $391 one-way.
What are the most popular routes from Seattle to London?
When deciding which route to take from Seattle to London consider Seattle/Tacoma Intl - London Heathrow, Seattle/Tacoma Intl - London Gatwick or Seattle/Tacoma Intl - London City as they are the most popular.
What are the most reliable airlines from Seattle to London?
Consider Aeromexico (82%), Singapore Airlines (81%) or American Airlines (72%) when booking your flight. These represent the most reliable airlines when flying from Seattle to London.
What are the cheapest flights from Seattle to London?
Looking at all options, your cheapest flight can be booked for $409. While the most popular route (Seattle/Tacoma Intl - London Heathrow) can be booked for $545 on average our data indicates $1,703 when flying from Seattle to London.
Where are the most common layover locations when flying from Seattle to London?
The most popular layover on flights from Seattle to London is Reykjavik.
What are some popular things to do or see while on a layover in Reykjavik?
Reykjavik travelers tend to visit Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool more than anywhere else. Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool are located about 23.2 mi, 23.3 mi, and 24.6 mi, respectively from Reykjavik Keflavik Intl. Travelers in need of a car in Reykjavik can rent one for about $54 per day.
Where are the least popular layover locations for Seattle to London flights?
Flights departing from Seattle and landing in London layover in Dublin least frequently.
Can I find deals for flights from Seattle to London that include hotel bookings?
Yes. In addition to deals on Seattle to London flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Seattle to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to London.
Can I find deals for business class flights from Seattle to London?
Yes. Cheapflights offers flight deals from Seattle to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Seattle to London?
Currently, November is the cheapest month in which you can book a flight from Seattle to London (average of $661). Flying from Seattle to London in June is currently the most expensive (average of $1,136). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Top 10 airlines flying from Seattle to London

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest$503	Average$689	FlexibilityNo cancel fee	On-time76%
Lufthansa	Cheapest$519	Average$732	FlexibilityNo cancel fee	On-time76%
Iberia	Cheapest$582	Average$745	FlexibilityNo cancel fee	On-time77%
Aer Lingus	Cheapest$583	Average$842	FlexibilityNo cancel fee	On-timeN/A
Finnair	Cheapest$586	Average$785	FlexibilityNo cancel fee	On-time76%
Air France	Cheapest$588	Average$891	FlexibilityNo cancel fee	On-time77%
KLM	Cheapest$597	Average$822	FlexibilityNo cancel fee	On-time75%
Virgin Atlantic	Cheapest$607	Average$868	FlexibilityNo cancel fee	On-time72%
Delta	Cheapest$609	Average$871	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$611	Average$885	FlexibilityNo cancel fee	On-time69%

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$273+ Cheap flights from Seattle (SEA) to London (LON)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/2. Fares are subject to change and may not be available on all flights or dates of travel.

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The best prices from Seattle/Tacoma Intl to London are usually found in January or October, booked 46 days in advance, depart on a Tuesday or Monday and return on a Wednesday

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Cheapest flights from Seattle to LondonExplore the most affordable flight options available from Seattle to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 25, 2025.

Explore the most affordable flight options available from Seattle to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 25, 2025.

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Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

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The best insider tips for Seattle to London flights

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Best time to book a flight from Seattle to London

Have a flexible travel schedule? Discover the best time to fly to London from Seattle with our price prediction graph.

Travel insights for flights from Seattle to London

Get recent, data-driven insights about flights from Seattle to London including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Seattle to London?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to London. Price data was last updated on February 25, 2025.

What is the cheapest month to book a flight from Seattle to London?

What is the cheapest time of day to fly from SEA to LON?

Find hourly flight availability from Seattle to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 25, 2025.

What is the cheapest day to fly from Seattle to London?

Use this chart to determine the cheapest time to fly round-trip from Seattle to London. Price data was last updated on December 16, 2024.

Weekly flight availability from Seattle to London

Explore weekly flight availability from Seattle to London. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated February 25, 2025.

Rainfall in London by month

Plan your trip to London by taking into account the average rainfall totals by month.

Temperature in London by month

Plan your trip to London by taking into account the average temperature totals by month.

Reviews of airlines servicing London

See what other customers who have flown with Delta, KLM and Finnair from Seattle to London have to say. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Seattle to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights from Seattle to London?

What are the cheapest airlines flying from Seattle to London round-trip?

What are the cheapest airlines to fly from Seattle to London one-way?

What are the most popular routes from Seattle to London?

What are the most reliable airlines from Seattle to London?

What are the cheapest flights from Seattle to London?

Where are the most common layover locations when flying from Seattle to London?

What are some popular things to do or see while on a layover in Reykjavik?

Where are the least popular layover locations for Seattle to London flights?

Can I find deals for flights from Seattle to London that include hotel bookings?

How can I find direct flights from Seattle to London?

Can I find deals for business class flights from Seattle to London?

What is the cheapest month to book a flight from Seattle to London?

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Alternative routes for Seattle to London

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Top 10 airlines flying from Seattle to London

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Cheapest flights from Seattle to London
Explore the most affordable flight options available from Seattle to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 25, 2025.