London

$270+ 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 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
Dec 28 — Jan 41
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to London with Cheapflights

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”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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

Cheap flight deals from Seattle to London

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 23, 2024.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$587
(Kiwi.com)

One-way from

$270
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$996
Provider with most accurate pricing for Seattle/Tacoma Intl-London (LON) flight deals.
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-London (LON) flights.
From Seattle/Tacoma Intl to London (LON)
One-way flight from Seattle/Tacoma Intl to London (LON)
High demand for flights, 21% potential price rise
Best time to find cheap flights, 4% potential price drop
Average for round-trip flights in December 2024

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 December 23, 2024.

This Kiwi.com deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3111:49 amSEA - LGW
1 stop14h 46mMultiple Airlines
Mon 3/312:15 pmLGW - SEA
2 stops56h 06mMultiple Airlines
Deal found 12/22$688
This FlightHub deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/312:35 pmSEA - LHR
1 stop20h 55mIcelandair
Mon 3/319:25 pmLHR - SEA
1 stop28h 25mIcelandair
Deal found 12/22$724
This Icelandair deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/292:35 pmSEA - LGW
1 stop12h 20mIcelandair
Tue 4/11:00 pmLGW - SEA
1 stop12h 50mIcelandair
Deal found 12/22$741
This Air Canada deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3110:35 amSEA - LHR
1 stop15h 35mMultiple Airlines
Tue 4/19:30 amLHR - SEA
2 stops19h 56mMultiple Airlines
Deal found 12/22$815
This Lufthansa deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2910:35 amSEA - LHR
1 stop15h 35mLufthansa
Fri 4/49:00 amLHR - SEA
1 stop15h 59mLufthansa
Deal found 12/22$821
This Iberia deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/306:50 pmSEA - LHR
Nonstop9h 25mIberia
Wed 1/223:00 pmLHR - SEA
Nonstop9h 55mIberia
Deal found 12/22$835
This Finnair deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/316:50 pmSEA - LHR
Nonstop9h 25mFinnair
Fri 4/44:30 pmLHR - SEA
Nonstop9h 50mFinnair
Deal found 12/22$836
This British Airways deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/311:35 pmSEA - LHR
1 stop13h 55mBritish Airways
Wed 4/29:50 amLHR - SEA
Nonstop9h 45mBritish Airways
Deal found 12/22$841
This Delta deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/305:45 pmSEA - LHR
Nonstop9h 25mDelta
Wed 1/226:30 amLHR - SEA
1 stop13h 21mDelta
Deal found 12/22$852
This Air Canada deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3110:35 amSEA - LHR
1 stop15h 35mAir Canada
Sun 3/309:30 amLHR - SEA
2 stops19h 56mAir Canada
Deal found 12/22$889
This Turkish Airlines deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/317:00 pmSEA - LGW
1 stop18h 30mTurkish Airlines
Thu 4/35:15 pmLGW - SEA
1 stop31h 55mTurkish Airlines
Deal found 12/22$904
This United Airlines deal was found by Cheapflights users on 12/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2311:59 pmSEA - LHR
1 stop23h 31mUnited Airlines
Mon 2/2411:10 amLHR - SEA
1 stop34h 10mUnited Airlines
Deal found 12/22$1,093

Find flights from Seattle to London within your budget

Customize your flight search to find flights from Seattle to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 23, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 1/20

5:55 pm-10:35 am

2 stops32h 40m

London Gatwick

Tue 2/4

12:00 pm-12:19 am

1 stop20h 19m

$587

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 2/3

2:35 pm-7:30 pm

1 stop20h 55m

London Heathrow

Mon 2/10

2:50 pm-2:21 pm

1 stop31h 31m

$588

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 2/5

2:35 pm-7:30 pm

1 stop20h 55m

London Heathrow

Wed 2/12

8:40 pm-5:00 pm

1 stop28h 20m

$592

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 2/3

2:35 pm-10:55 am

1 stop12h 20m

London Gatwick

Mon 2/10

11:55 am-5:00 pm

1 stop13h 05m

$596

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 2/4

3:15 pm-12:50 pm

1 stop13h 35m

London Heathrow

Tue 2/11

2:50 pm-2:21 pm

1 stop31h 31m

$599

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 3/3

6:50 pm-12:15 pm

Nonstop9h 25m

London Heathrow

Tue 3/18

9:25 am-12:20 pm

Nonstop9h 55m

$616

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Wed 1/22

2:35 pm-11:15 pm

2 stops24h 40m

London Luton

Wed 1/29

6:50 am-5:00 pm

2 stops18h 10m

$618

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Mon 2/3

2:35 pm-8:40 pm

2 stops22h 05m

London Stansted

Mon 2/10

8:15 am-5:00 pm

2 stops16h 45m

$623

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 2/3

7:30 am-9:20 am

2 stops17h 50m

London Heathrow

Mon 2/10

6:40 am-10:25 pm

2 stops23h 45m

$639

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 1/19

7:05 pm-7:10 am

2 stops28h 05m

London Heathrow

Tue 2/4

1:25 pm-10:07 pm

2 stops16h 42m

$658

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/23

Showing 1-10 of 60 results
1
2
3
...
6

Compare providers for flights from Seattle to London

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.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to London in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*1 star
oojoPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy2 starsTrust Score*2 stars
KAYAKPrice Accuracy3 starsTrust Score*3 stars
GotogatePrice Accuracy2 starsTrust Score*2 stars
SmartFaresPrice Accuracy2 starsTrust 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.

Read more about Deltaby Harriet Baskas
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.

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.

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.

Read more about Iberiaby Emily Zemler
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.

Our travel experts
Harriet Baskas

Harriet Baskas

Expert on Delta

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Gabriel Leigh

Gabriel Leigh

Expert on British Airways

Gabriel Leigh

Gabriel Leigh

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
Blane Bachelor

Blane Bachelor

Expert on Virgin Atlantic

Blane Bachelor

Blane Bachelor

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Read more
Bill Fink

Bill Fink

Expert on Icelandair

Bill Fink

Bill Fink

Bill is an award-winning travel writer with extensive credits covering airlines and the aviation industry for publications including AARP, AFAR, The Points Guy and Yahoo. Based in Portland, Oregon, Bill has traveled to more than 75 countries - and been late for his flight in most of them. He once achieved top-level frequent flier status for all of American, Delta and United Airlines during a single year.

Read more
Emily Zemler

Emily Zemler

Expert on Iberia

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more
Marisa Garcia

Marisa Garcia

Expert on American Airlines

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more

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?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to London. Price data was last updated on December 20, 2024.

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 $1,135). 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?

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 December 23, 2024.

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 19% on airfare.

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.

Travelers seeking maximum savings on their Seattle to London flight should consider departing on Tuesday afternoons 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

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 December 23, 2024.

The most flights from SEA to LON are scheduled on a Friday (21 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (10 on average).

Rainfall in London by month

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

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

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated December 23, 2024.
See what other customers who have flown with Turkish Airlines, Air Canada and United Airlines 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.
8.0
Very good
8,588 reviews

Comfort

8.0

Crew

8.6

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 10

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

8.0
Very good
8,588 reviews
8.0
Very good
8,588 reviews

Comfort

8.0

Crew

8.6

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 10

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

7.8
Good
1,345 reviews
8.0
Very good
8,588 reviews

Comfort

8.0

Crew

8.6

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 10

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

7.7
Good
1,285 reviews
8.0
Very good
8,588 reviews

Comfort

8.0

Crew

8.6

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 10

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

7.6
Good
1,605 reviews
8.0
Very good
8,588 reviews

Comfort

8.0

Crew

8.6

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 10

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

7.5
Good
667 reviews
8.0
Very good
8,588 reviews

Comfort

8.0

Crew

8.6

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 10

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

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?

    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 13 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 $592. Other airlines that can offer you cheap pricing are WestJet, from $599, and Iberia, from $616. Users have found that Icelandair is 27% 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 $270 on WestJet. Other airlines that offer cheap prices include Icelandair from $272 and Lufthansa from $324 one-way.

  • What are the most popular routes from Seattle to London?

  • What are the most reliable airlines from Seattle to London?

    Consider KLM (89%), Singapore Airlines (86%) or Air France (84%) 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 $407. While the most popular route (Seattle/Tacoma Intl - London Heathrow) can be booked for $584 on average our data indicates $1,827 when flying 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?

    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 $50 per day.

  • 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?

    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 $1,135). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 10 airlines flying from Seattle to London

Discover the top 10 airlines that operate flights from Seattle to London. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 23, 2024.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$384Average$689FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$497Average$678FlexibilityNo cancel feeOn-time76%
FinnairCheapest$560Average$832FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$581Average$828FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$583Average$748FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$588Average$901FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$590Average$802FlexibilityNo cancel feeOn-time70%
KLMCheapest$597Average$848FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$600Average$890FlexibilityNo cancel feeOn-time71%
DeltaCheapest$602Average$894FlexibilityNo cancel feeOn-timeN/A
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.