Delta One offers 180-degree flat-bed seats and premium food and drinks.
Comfort Plus provides extra legroom and complimentary alcoholic drinks.
$267+ 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 2/24. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
Jan 28 — Feb 41
1 adult, Economy
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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 Sunday 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 January 23, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $584 (oojo) |
One-way from | $267 (Kiwi.com) |
Popular in | June |
Cheapest in | October |
Average price | $674 |
Good round-trip deal | $709 or less |
Good one-way deal | $466 or less |
Find flight deals from Seattle to London
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 January 23, 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 January 23, 2025.
This oojo deal was found by Cheapflights users on 1/22. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/13:45 pmSEA - LGW
1 stop12h 00mIcelandair
Thu 4/101:00 pmLGW - SEA
1 stop12h 50mIcelandair
Deal found 1/22![Icelandair logo]()
$584
This Gotogate deal was found by Cheapflights users on 1/23. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/42:35 pmSEA - LHR
1 stop20h 55mIcelandair
Tue 3/118:40 pmLHR - SEA
1 stop28h 20mIcelandair
Deal found 1/23![Icelandair logo]()
$584
This Aer Lingus deal was found by Cheapflights users on 1/23. 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 Aer Lingus is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/179:00 pmSEA - LHR
1 stop15h 50mAer Lingus
Wed 3/267:50 amLHR - SEA
1 stop18h 25mAer Lingus
Deal found 1/23![Aer Lingus logo]()
$589
This Gotogate deal was found by Cheapflights users on 1/23. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/46:50 pmSEA - LHR
Nonstop9h 25mIberia
Tue 3/119:25 amLHR - SEA
Nonstop9h 55mIberia
Deal found 1/23![Iberia logo]()
$590
This Finnair deal was found by Cheapflights users on 1/23. 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 4/291:30 pmSEA - LHR
Nonstop9h 20mFinnair
Wed 5/79:30 amLHR - SEA
1 stop14h 30mFinnair
Deal found 1/23![Finnair logo]()
$592
This Mytrip deal was found by Cheapflights users on 1/21. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/112:35 pmSEA - STN
2 stops20h 25mMultiple Airlines
Wed 2/2610:25 pmSTN - SEA
2 stops26h 35mMultiple Airlines
Deal found 1/21![Multiple Airlines logo]()
$593
This Cheapflightsfares deal was found by Cheapflights users on 1/22. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/1110:35 amSEA - LHR
1 stop15h 35mLufthansa
Tue 2/256:35 amLHR - SEA
1 stop14h 45mLufthansa
Deal found 1/22![Lufthansa logo]()
$594
This Flightnetwork deal was found by Cheapflights users on 1/23. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/37:05 pmSEA - LHR
2 stops28h 05mAir Canada
Thu 3/133:00 pmLHR - SEA
2 stops30h 30mAir Canada
Deal found 1/23![Air Canada logo]()
$596
This Mytrip deal was found by Cheapflights users on 1/21. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/198:00 pmSEA - LGW
1 stop15h 55mMultiple Airlines
Wed 2/2611:15 amLGW - SEA
1 stop15h 00mMultiple Airlines
Deal found 1/21![Multiple Airlines logo]()
$606
This Ticket deal was found by Cheapflights users on 1/22. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/410:35 amSEA - LHR
1 stop15h 35mMultiple Airlines
Wed 3/128:55 amLHR - SEA
2 stops20h 58mMultiple Airlines
Deal found 1/22![Multiple Airlines logo]()
$606
This Mytrip deal was found by Cheapflights users on 1/21. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/198:00 pmSEA - LTN
1 stop19h 15mMultiple Airlines
Wed 2/266:50 amLTN - SEA
1 stop19h 25mMultiple Airlines
Deal found 1/21![Multiple Airlines logo]()
$607
This KLM deal was found by Cheapflights users on 1/23. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/97:55 pmSEA - LHR
Nonstop9h 45mKLM
Sun 3/163:50 pmLHR - SEA
Nonstop10h 15mKLM
Deal found 1/23![KLM logo]()
$609
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 January 23, 2025.
Fly from
Any airport
Fly to
Any airport
Route
Depart
Return
Price
SeattleLondon
SEA - LGW
SEALGW
Seattle/Tacoma Intl
Tue 4/1
3:45 pm-11:45 am
1 stop12h 00m
London Gatwick
Thu 4/10
1:00 pm-5:50 pm
1 stop12h 50m
$584
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Mon 2/17
2:35 pm-10:50 am
1 stop12h 15m
London Heathrow
Mon 3/3
12:15 pm-5:00 pm
1 stop12h 45m
$584
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Tue 2/11
1:35 pm-7:00 am
Nonstop9h 25m
London Heathrow
Wed 2/26
3:00 pm-4:55 pm
Nonstop9h 55m
$586
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Wed 2/19
8:00 pm-3:35 pm
1 stop11h 35m
London Heathrow
Wed 2/26
9:50 am-6:15 pm
1 stop16h 25m
$589
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Tue 4/29
1:30 pm-6:50 am
Nonstop9h 20m
London Heathrow
Wed 5/7
9:30 am-4:00 pm
1 stop14h 30m
$592
SeattleLondon
SEA - STN
SEASTN
Seattle/Tacoma Intl
Tue 2/11
2:35 pm-7:00 pm
2 stops20h 25m
London Stansted
Wed 2/26
10:25 pm-5:00 pm
2 stops26h 35m
$593
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Mon 3/3
5:45 pm-11:10 am
Nonstop9h 25m
London Heathrow
Thu 3/13
6:20 am-12:20 pm
1 stop13h 00m
$603
SeattleLondon
SEA - LHR
SEALHR
Seattle/Tacoma Intl
Mon 3/3
7:05 pm-7:10 am
2 stops28h 05m
London Heathrow
Thu 3/13
1:00 pm-10:00 pm
1 stop16h 00m
$606
SeattleLondon
SEA - LGW
SEALGW
Seattle/Tacoma Intl
Wed 2/19
8:00 pm-7:55 pm
1 stop15h 55m
London Gatwick
Wed 2/26
11:15 am-6:15 pm
1 stop15h 00m
$606
SeattleLondon
SEA - LTN
SEALTN
Seattle/Tacoma Intl
Wed 2/19
8:00 pm-11:15 pm
1 stop19h 15m
London Luton
Wed 2/26
6:50 am-6:15 pm
1 stop19h 25m
$607
Showing 1-10 of 60 results
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 January.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- 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
![British Airways]()
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]()
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]()
Icelandair
Saga Premium includes noise-cancelling headphones and generous legroom.
Economy Light allows carry-on only with optional seat selection for savings.
![Iberia]()
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]()
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
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 January 17, 2025.
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 $1,137). 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 January 23, 2025.
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?
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 at noon 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 January 23, 2025.
The most flights from SEA to LON are scheduled on a Wednesday (16 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (11 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 January 23, 2025.
See what other customers who have flown with Aer Lingus, Lufthansa and Virgin Atlantic 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.
732 reviews
Crew
8.5
Overall
8.2
Boarding
8.3
Entertainment
8.0
Food
7.8
Comfort
8.0
Reviews
1 / 10
For the money it’s good value. Seat space rather small
732 reviews
732 reviews
Crew
8.5
Overall
8.2
Boarding
8.3
Entertainment
8.0
Food
7.8
Comfort
8.0
Reviews
1 / 10
For the money it’s good value. Seat space rather small
8,508 reviews
732 reviews
Crew
8.5
Overall
8.2
Boarding
8.3
Entertainment
8.0
Food
7.8
Comfort
8.0
Reviews
1 / 10
For the money it’s good value. Seat space rather small
9,699 reviews
732 reviews
Crew
8.5
Overall
8.2
Boarding
8.3
Entertainment
8.0
Food
7.8
Comfort
8.0
Reviews
1 / 10
For the money it’s good value. Seat space rather small
1,338 reviews
732 reviews
Crew
8.5
Overall
8.2
Boarding
8.3
Entertainment
8.0
Food
7.8
Comfort
8.0
Reviews
1 / 10
For the money it’s good value. Seat space rather small
1,286 reviews
732 reviews
Crew
8.5
Overall
8.2
Boarding
8.3
Entertainment
8.0
Food
7.8
Comfort
8.0
Reviews
1 / 10
For the money it’s good value. Seat space rather small
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.
Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsHayes
Hounslow
Thornton Heath
Harrow
Luton
Wembley
Canterbury
Gatwick
Horley
Milton Keynes
Dover
Watford
Orpington
Croydon
Borehamwood
Bromley
Folkestone
Ilford
Aylesbury
Chelmsford
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Seattle to London
See prices for flight routes from nearby airports that may be better suited for you.
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 January 23, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$384 | Average$686 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$493 | Average$785 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$494 | Average$680 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$583 | Average$756 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$588 | Average$909 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$589 | Average$853 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$597 | Average$844 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$599 | Average$890 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$602 | Average$889 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$610 | Average$869 | FlexibilityNo cancel fee | On-time67% |