Cheap flights from Seattle (SEA) to London (LON)

SEA — LON
Feb 12 — Feb 191

The best prices from Seattle/Tacoma Intl to London are usually found in January or February, booked 31 days in advance, depart on a Tuesday or Monday and return on a Tuesday

How to find the cheapest flight from Seattle (SEA) to London (LON)

All the information you need to plan the best SEA to LON flight in 2023: compare Seattle to London flight prices with the expected peak season, weather and rainfall in London.

SEA - LON

Price

$759 - $1,174

LON

Temperature

39.2 - 62.6 °F

LON

Rainfall

1.6 - 2.8 inches

Popular inJulyHigh demand for flights, 20% potential price rise
Cheapest inJanuaryBest time to find cheap flights, 19% potential price drop
Round-trip from$759From Seattle/Tacoma Intl to London (LON)
One-way from$359One-way flight from Seattle/Tacoma Intl to London (LON)

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 29 days in advance, which can save you up to 46% on flights from Seattle to London compared to booking the week you need them. Waiting 29 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 $1,186. For sooner than that we have options available in the next 3 days from $1,565.

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 $936 per person but you can even find prices for as low as $573. The most expensive prices can be found in the month of July. Opting for a January flight can save you 25% on your journey compared to booking in July

When is the cheapest time to fly from Seattle to London (SEA - 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 at noon could potentially save you up to 11% on airfare.

Cheap flights from Seattle to London in February, March 2023

The best prices found for SEA to LON flights for February, March

Seattle to London 2023 flight deals

Cheap flights to London from Seattle found for this year

Cheap Icelandair flights from Seattle to London

  • One of the most popular airlines traveling from Seattle to London is Icelandair. Seattle to London flights are typically 56% cheaper than other airlines traveling the same route. Flights from Icelandair typically cost $963.35 RT. The cheapest Icelandair flight found for this route was $648. The most popular departure airport in Seattle when flying to London is Seattle/Tacoma Intl Airport. The most popular airport to fly into when visiting London is London Heathrow Airport. When flying from Seattle to London, Icelandair flights are 7% more popular than any other airline flying that same route.

Cheap Delta flights from Seattle to London

  • One of the most popular airlines traveling from Seattle to London is Delta. Flights from Delta traveling this route typically cost $1,078.54 RT. This price is typically 54% cheaper than other airlines that offer Seattle to London flights. When booking this route, the cheapest RT price found was $666. Seattle/Tacoma Intl Airport is the most common Seattle airport to take off from when flying to London. London Heathrow Airport is the most popular arrival airport in London. When flying from Seattle to London, Delta flights are 5% more popular than any other airline flying that same route.

Non-stop flights to London from Seattle

Save time with Seattle to London direct flight deals

Last minute flights from Seattle to London

Late deals on return flights to London from Seattle, departing today and this week

One-way flights to London from Seattle

The cheapest one-way flights from Seattle to London

Reviews of Airlines Servicing London

Delta
7.9
Good
2,082 reviews

Entertainment

7.8

Comfort

7.9

Crew

8.5

Overall

7.9

Food

7.2

Boarding

8.1

Reviews

1 / 10

Had to abort landing and fly around to land again because there was a corporate jet still taxiing on the runway, but I can’t hold that against them, glad we made it safe! Flight attendants were really great!

Delta
7.9
Good
2,082 reviews
Delta
7.9
Good
2,082 reviews

Entertainment

7.8

Comfort

7.9

Crew

8.5

Overall

7.9

Food

7.2

Boarding

8.1

Reviews

1 / 10

Had to abort landing and fly around to land again because there was a corporate jet still taxiing on the runway, but I can’t hold that against them, glad we made it safe! Flight attendants were really great!

SWISS
7.7
Good
318 reviews
Delta
7.9
Good
2,082 reviews

Entertainment

7.8

Comfort

7.9

Crew

8.5

Overall

7.9

Food

7.2

Boarding

8.1

Reviews

1 / 10

Had to abort landing and fly around to land again because there was a corporate jet still taxiing on the runway, but I can’t hold that against them, glad we made it safe! Flight attendants were really great!

KLM
7.5
Good
120 reviews
Delta
7.9
Good
2,082 reviews

Entertainment

7.8

Comfort

7.9

Crew

8.5

Overall

7.9

Food

7.2

Boarding

8.1

Reviews

1 / 10

Had to abort landing and fly around to land again because there was a corporate jet still taxiing on the runway, but I can’t hold that against them, glad we made it safe! Flight attendants were really great!

American Airlines
7.4
Good
1,684 reviews
Delta
7.9
Good
2,082 reviews

Entertainment

7.8

Comfort

7.9

Crew

8.5

Overall

7.9

Food

7.2

Boarding

8.1

Reviews

1 / 10

Had to abort landing and fly around to land again because there was a corporate jet still taxiing on the runway, but I can’t hold that against them, glad we made it safe! Flight attendants were really great!

Turkish Airlines
7.3
Good
1,167 reviews
Delta
7.9
Good
2,082 reviews

Entertainment

7.8

Comfort

7.9

Crew

8.5

Overall

7.9

Food

7.2

Boarding

8.1

Reviews

1 / 10

Had to abort landing and fly around to land again because there was a corporate jet still taxiing on the runway, but I can’t hold that against them, glad we made it safe! Flight attendants were really great!

Related info for your journey

Useful info, stats and facts about Seattle to London flights.

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 15 flights from Seattle/Tacoma Intl to London per day from 21 different airlines.

Which airlines flying from Seattle/Tacoma Intl to London have flexible cancellations due to COVID-19?

British Airways, Virgin Atlantic, and Icelandair are some of the carriers that may have flexible cancellation policies. You can use our site to filter for other airlines that may also have this kind of flexibility.

Can I find flights from Seattle to London for under $600 on Cheapflights?

Yes, there are multiple flights from Seattle to London for under $600. The cheapest flight booked recently is on British Airways for just $536, but on average you can expect to pay $552.

Are there nonstop flights from Seattle to London for under $600 on Cheapflights?

Cheapflights has at least 20 direct flights from Seattle to London under $600. A good price for a nonstop flight from Seattle to London is less than $594.

Are there last-minute flights available from Seattle to London for under $700?

There are currently 20+ open flights from Seattle to London within the next 7 days for less than $700.

What days are nonstop flights available from Seattle to London?

Days when nonstop flights are available for this flight are: Thursday.

How many flights depart from Seattle to London on average per day?

Travelers can expect 3 flights from Seattle to London on average per day.
Evening (6pm - Midnight) - 100% of flight departures

How long is the flight from Seattle to London?

A quick flight from Seattle to London can take about 9h 22m. British Airways provides one of the quickest options available for as low as $536. The distance between Seattle and London is about 4812 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

Cheapflights users have booked flights from Seattle to London round-trip from $536. Other airlines that can offer you cheap pricing are Icelandair, from $538, and Finnair, from $553. Users have found that British Airways is 42% cheaper than the other options available to this destination.

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 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.

What are the most reliable airlines from Seattle to London?

Consider Alaska Airlines (77%), Air France (70%) or Delta (70%) 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 $545. While the most popular route (Seattle/Tacoma Intl - London Heathrow) can be booked for $536 on average our data indicates $3,400 when flying from Seattle to London.

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

The chart below displays the airlines Cheapflights users traveling from Seattle to London choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
AirlineCheapestAverageFlexibilityOn-timeCOVID-19 safety
Juneyao AirlinesCheapest$11Average$19FlexibilityNo cancel feeOn-time66%COVID-19 safety
Search Juneyao Airlines flights
Norwegian Air UKCheapest$377Average$635FlexibilityNo cancel feeOn-timeN/ACOVID-19 safety
Search Norwegian Air UK flights
NorwegianCheapest$403Average$697FlexibilityNo cancel feeOn-time74%COVID-19 safety
Search Norwegian flights
Austrian AirlinesCheapest$438Average$877FlexibilityNo cancel feeOn-time78%COVID-19 safety
Search Austrian Airlines flights
IcelandairCheapest$483Average$783FlexibilityNo cancel feeOn-time76%COVID-19 safety
Search Icelandair flights
Aer LingusCheapest$509Average$858FlexibilityNo cancel feeOn-timeN/ACOVID-19 safety
Search Aer Lingus flights
FinnairCheapest$585Average$826FlexibilityNo cancel feeOn-time76%COVID-19 safety
Search Finnair flights
IberiaCheapest$610Average$855FlexibilityNo cancel feeOn-time77%COVID-19 safety
Search Iberia flights
American AirlinesCheapest$623Average$973FlexibilityNo cancel feeOn-time71%COVID-19 safety
Search American Airlines flights
British AirwaysCheapest$643Average$988FlexibilityNo cancel feeOn-time70%COVID-19 safety
Search British Airways flights

Hourly flight availability from Seattle to London

See what time of day planes typically take off from Seattle to London
1%of flight departuresEarly morningMidnight to 6 am
0%of flight departuresMorning6 am to noon
58%of flight departuresAfternoonNoon to 6 pm
41%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from Seattle to London

See how many times per day planes take to the skies headed from Seattle to London
Sunday20daily flights
Monday14daily flights
Tuesday16daily flights
Wednesday14daily flights
Thursday16daily flights
Friday13daily flights
Saturday16daily flights
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