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Cheap flights from Seattle to London from C$ 338

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 30/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
26 Nov — 3 Dec1
1 adult

The best prices from Seattle/Tacoma Intl to London are usually found in January or October, booked 7 days in advance, depart on a Wednesday or Tuesday and return on a Monday

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 21 November 2024.

Round-trip from

C$ 857

One-way from

C$ 338

Popular in

June

Cheapest in

January
Icelandair
  • Icelandair
  • 22/4-2/5
  • 2 total stops
  • 27h 45m total
  • Seattle to London
Search Deals
30/11
  • 30/11
  • 1 total stop
  • 29h 00m total
  • Seattle to London
Search Deals
High demand for flights, 32% potential price rise
Search Deals
Best time to find cheap flights, 18% potential price drop
Search Deals

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 21 November 2024.

Mon 30/122:35 p.m.SEA - LGW
1 stop12h 20mIcelandair
Mon 20/111:55 a.m.LGW - SEA
1 stop13h 05mIcelandair
Deal found 20/11C$ 869
Wed 11/124:00 p.m.SEA - LGW
1 stop34h 35mMultiple Airlines
Thu 16/112:00 p.m.LGW - SEA
1 stop20h 14mMultiple Airlines
Deal found 20/11C$ 874
Sun 29/1210:35 a.m.SEA - LHR
1 stop15h 35mUnited Airlines
Tue 14/16:35 a.m.LHR - SEA
1 stop14h 45mUnited Airlines
Deal found 20/11C$ 901
Sun 29/126:55 p.m.SEA - LHR
Nonstop9h 45mKLM
Fri 17/16:30 a.m.LHR - SEA
1 stop13h 20mKLM
Deal found 20/11C$ 903
Sun 29/1210:35 a.m.SEA - LHR
1 stop15h 35mLufthansa
Thu 9/11:00 p.m.LHR - SEA
1 stop13h 25mLufthansa
Deal found 20/11C$ 922
Mon 30/125:45 p.m.SEA - LHR
Nonstop9h 25mDelta
Mon 20/16:30 a.m.LHR - SEA
1 stop13h 20mDelta
Deal found 20/11C$ 973
Wed 4/129:40 a.m.SEA - LHR
2 stops24h 50mMultiple Airlines
Wed 11/126:40 a.m.LHR - SEA
2 stops22h 50mMultiple Airlines
Deal found 21/11C$ 1,009
Sun 29/126:50 p.m.SEA - LHR
Nonstop9h 25mBritish Airways
Thu 16/13:00 p.m.LHR - SEA
Nonstop9h 55mBritish Airways
Deal found 20/11C$ 1,012
Thu 28/112:35 p.m.SEA - LHR
1 stop20h 55mIcelandair
Thu 5/128:40 p.m.LHR - SEA
1 stop28h 20mIcelandair
Deal found 20/11C$ 1,020
Mon 30/126:50 p.m.SEA - LHR
Nonstop9h 25mIberia
Sat 11/19:25 a.m.LHR - SEA
Nonstop9h 55mIberia
Deal found 20/11C$ 1,106
Wed 4/122:00 p.m.SEA - LGW
2 stops19h 50mSWISS
Wed 11/126:45 p.m.LGW - SEA
2 stops36h 01mSWISS
Deal found 21/11C$ 1,153
Tue 31/125:45 p.m.SEA - LHR
Nonstop9h 25mAir France
Tue 7/18:05 p.m.LHR - SEA
1 stop31h 56mAir France
Deal found 20/11C$ 1,180

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 645,034 searches. Data last updated 21 November 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 22/4

6:55 p.m.-2:40 p.m.

1 stop11h 45m

London Gatwick

Fri 2/5

3:40 p.m.-8:35 p.m.

1 stop12h 55m

C$ 857

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 18/4

6:55 p.m.-8:20 p.m.

1 stop17h 25m

London Heathrow

Wed 30/4

1:05 p.m.-5:40 p.m.

1 stop12h 35m

C$ 858

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Wed 11/12

4:00 p.m.-10:35 a.m.

1 stop34h 35m

London Gatwick

Thu 16/1

12:00 p.m.-12:14 a.m.

1 stop20h 14m

C$ 874

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 8/4

7:40 p.m.-1:00 p.m.

Nonstop9h 20m

London Heathrow

Wed 14/5

10:20 a.m.-4:00 p.m.

1 stop13h 40m

C$ 885

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 13/1

10:35 a.m.-10:10 a.m.

1 stop15h 35m

London Heathrow

Tue 28/1

6:30 a.m.-6:30 p.m.

2 stops20h 00m

C$ 897

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 29/12

10:35 a.m.-10:10 a.m.

1 stop15h 35m

London Heathrow

Tue 14/1

6:35 a.m.-1:20 p.m.

1 stop14h 45m

C$ 901

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 29/12

6:55 p.m.-12:40 p.m.

Nonstop9h 45m

London Heathrow

Thu 16/1

6:30 a.m.-11:50 a.m.

1 stop13h 20m

C$ 903

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 7/1

5:45 p.m.-11:10 a.m.

Nonstop9h 25m

London Heathrow

Tue 14/1

1:15 p.m.-3:15 p.m.

Nonstop10h 00m

C$ 935

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 21/4

1:30 p.m.-6:50 a.m.

Nonstop9h 20m

London Heathrow

Tue 6/5

9:50 a.m.-11:35 a.m.

Nonstop9h 45m

C$ 939

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 12/1

12:50 p.m.-5:50 p.m.

2 stops21h 00m

London Gatwick

Wed 22/1

6:45 p.m.-10:53 p.m.

2 stops36h 08m

C$ 950

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/11

Showing 1-10 of 43 results
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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.
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 15 November 2024.

The price you pay for your flight from Seattle to London may vary depending on when you book. For the best chance of a lower fare, look to book 7 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, January is the cheapest month in which you can book a flight from Seattle to London (average of C$ 560). Flying from Seattle to London in July is currently the most expensive (average of C$ 877). 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 21 November 2024.

It’s optimal to fly from Seattle to London in the morning. By choosing this option you can save up to 12% on the cost of your flight, compared to a flight at noon.

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 21 November 2024.

The most flights from SEA to LON are scheduled on a Tuesday (18 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (6 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 40.0 - 70.0 mm per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London when rainfall is around 40.0 mm.

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 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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 21 November 2024.
To help decide which airline to fly from Seattle to London, see what other customers have to say about Finnair, Lufthansa and United Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
China Airlines
8.3
Very good
778 reviews
Check prices

Food

7.8

Comfort

8.0

Boarding

8.3

Entertainment

8.0

Crew

8.6

Overall

8.3

Reviews

1 / 10

Had a beer dropped in my lap which was a total accident, what I want impressed with was the fact that I had to ask for a towel to clean up my leg and the ground. From Taipei to Seattle

China Airlines
8.3
Very good
778 reviews
China Airlines
8.3
Very good
778 reviews
Check prices

Food

7.8

Comfort

8.0

Boarding

8.3

Entertainment

8.0

Crew

8.6

Overall

8.3

Reviews

1 / 10

Had a beer dropped in my lap which was a total accident, what I want impressed with was the fact that I had to ask for a towel to clean up my leg and the ground. From Taipei to Seattle

Delta
8.0
Very good
8,758 reviews
China Airlines
8.3
Very good
778 reviews
Check prices

Food

7.8

Comfort

8.0

Boarding

8.3

Entertainment

8.0

Crew

8.6

Overall

8.3

Reviews

1 / 10

Had a beer dropped in my lap which was a total accident, what I want impressed with was the fact that I had to ask for a towel to clean up my leg and the ground. From Taipei to Seattle

Alaska Airlines
8.0
Very good
9,458 reviews
China Airlines
8.3
Very good
778 reviews
Check prices

Food

7.8

Comfort

8.0

Boarding

8.3

Entertainment

8.0

Crew

8.6

Overall

8.3

Reviews

1 / 10

Had a beer dropped in my lap which was a total accident, what I want impressed with was the fact that I had to ask for a towel to clean up my leg and the ground. From Taipei to Seattle

KLM
7.8
Good
1,350 reviews
China Airlines
8.3
Very good
778 reviews
Check prices

Food

7.8

Comfort

8.0

Boarding

8.3

Entertainment

8.0

Crew

8.6

Overall

8.3

Reviews

1 / 10

Had a beer dropped in my lap which was a total accident, what I want impressed with was the fact that I had to ask for a towel to clean up my leg and the ground. From Taipei to Seattle

Finnair
7.7
Good
1,300 reviews
China Airlines
8.3
Very good
778 reviews
Check prices

Food

7.8

Comfort

8.0

Boarding

8.3

Entertainment

8.0

Crew

8.6

Overall

8.3

Reviews

1 / 10

Had a beer dropped in my lap which was a total accident, what I want impressed with was the fact that I had to ask for a towel to clean up my leg and the ground. From Taipei to Seattle

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?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to London. On average, Seattle/Tacoma Intl has 12 outbound flights to London per day from 7 airlines. Seattle/Tacoma Intl is conveniently located just 18.4 km from Seattle’s city centre.

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

    According to our current data, Icelandair (C$ 857), Finnair (C$ 885), and Lufthansa (C$ 897) offers the cheapest pricing from Seattle to London. These flights start at 24% lower than the current average price 3 months from now.

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

    C$ 401 is the cheapest one-way deal found within the past few days, from Icelandair. You may also be able to find cheap deals on WestJet and Scandinavian Airlines, with prices starting from C$ 491 and C$ 552, respectively.

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

    The top 3 most reliable airlines when flying from Seattle to London are KLM (76%), Air France (76%) and Delta (76%).

  • What are the cheapest flights from Seattle to London?

    Looking at all options, your cheapest flight can be booked for C$ 598. While the most popular route (Seattle/Tacoma Intl - London Gatwick) can be booked for C$ 869 on average our data indicates C$ 1,087 when flying from Seattle to London.

  • 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, January is the cheapest month in which you can book a flight from Seattle to London (average of C$ 560). Flying from Seattle to London in July is currently the most expensive (average of C$ 877). 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

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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.
Seattle to Gatwick flights
Seattle to Manchester flights
Seattle to Heathrow flights

Top 7 airlines flying from Seattle to London

Discover the top 7 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 645,034 searches. Data last updated 21 November 2024.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapestC$ 616AverageC$ 913FlexibilityNo cancel feeOn-time77%
Search Iberia flights
IcelandairCheapestC$ 616AverageC$ 867FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapestC$ 718AverageC$ 1,098FlexibilityNo cancel feeOn-time77%
Search Air France flights
KLMCheapestC$ 719AverageC$ 909FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapestC$ 819AverageC$ 1,055FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapestC$ 854AverageC$ 984FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
British AirwaysCheapestC$ 863AverageC$ 1,114FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Seattle to London?

Cheapflights helps you search for flights from Seattle to London via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Seattle to London?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Seattle to London for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Seattle to London with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Seattle to London flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Seattle to London become cheaper?

Yes! Start tracking prices for Seattle to London flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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