Cheap flights from Seattle to London

SEA — LON
17 May — 24 May1
Return
1 adult
Economy
From?
To?
Tue 17/5
Tue 24/5

The best prices from Seattle/Tacoma Intl to London are usually found in October or January, booked 60 days in advance, depart on a Saturday or Thursday and return on a Tuesday

How to find the cheapest flight from Seattle to London

All the information you need to plan the best SEA to LON flight in 2022: compare Seattle to London flight prices with the expected peak season, weather and rainfall in London.

SEA - LON

Price

C$ 487 - C$ 787

LON

Temperature

4 - 17 °C

LON

Rainfall

40 - 70 mm

Popular inDecemberHigh demand for flights, 27% potential price rise
Cheapest inOctoberBest time to find cheap flights, 15% potential price drop
Round-trip fromC$ 632From Seattle/Tacoma Intl to London (LON)
One-way fromC$ 578One-way flight from Seattle/Tacoma Intl to London (LON)

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

Saturday is generally a great day to depart. Flying on this day could help you save up to 43%.

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

To save up to 75% on this flight, we recommend booking at least 61 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Seattle to London from C$ 1,065 1-2 weeks out and tickets from C$ 1,401 for flights departing within the next 72 hours.

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

October is one of the best times of the year to fly to London from Seattle. Prices for October average C$ 747 per person but you can even find prices for as low as C$ 540. The most expensive prices can be found in the month of December. Opting for a October flight can save you 36% on your journey compared to booking in December

When is the cheapest time to fly from Seattle to London (SEA - LON)?

It’s optimal to fly from Seattle to London in the afternoon. By choosing this option you can save up to 42% on the cost of your flight, compared to a flight in the morning.

Cheap flights from Seattle to London in May, June 2022

The best prices found for SEA to LON flights for May, June
24 May - 14 Jun.
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 25m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

13h 10m
C$ 1,001

Virgin Atlantic

View Deal

Deal found 10/5/22

25 May - 16 Jun.
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

17h 09m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

14h 00m
C$ 1,008

Delta

View Deal

Deal found 11/5/22

24 May - 14 Jun.
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 40m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

9h 45m
C$ 1,026

Delta

View Deal

Deal found 10/5/22

Seattle to London 2022 flight deals

Cheap flights to London from Seattle found for this year
9 Aug. - 16 Aug.
SEA

Seattle/Tacoma Intl

LGW

London Gatwick

1 stop

13h 15m
LGW

London Gatwick

SEA

Seattle/Tacoma Intl

1 stop

16h 15m
C$ 926

Aer Lingus

View Deal

Deal found 11/5/22

29 Jul. - 8 Aug.
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

13h 55m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

12h 15m
C$ 962

Aer Lingus

View Deal

Deal found 10/5/22

11 Oct. - 19 Oct.
SEA

Seattle/Tacoma Intl

LGW

London Gatwick

1 stop

12h 00m
LGW

London Gatwick

SEA

Seattle/Tacoma Intl

1 stop

12h 50m
C$ 993

Icelandair

View Deal

Deal found 11/5/22

Cheap Finnair flights from Seattle to London

4 Oct. - 12 Oct.
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 15m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

15h 20m
C$ 1,044

Finnair

View Deal

Deal found 5/11/22

3 Oct. - 13 Oct.
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 15m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

16h 22m
C$ 1,104

Finnair

View Deal

Deal found 5/10/22

Cheap Aer Lingus flights from Seattle to London

9 Aug. - 16 Aug.
SEA

Seattle/Tacoma Intl

LGW

London Gatwick

1 stop

13h 15m
LGW

London Gatwick

SEA

Seattle/Tacoma Intl

1 stop

16h 15m
C$ 926

Aer Lingus

View Deal

Deal found 5/11/22

29 Jul. - 12 Aug.
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

13h 55m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

12h 15m
C$ 962

Aer Lingus

View Deal

Deal found 5/11/22

23 Sep. - 29 Sep.
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

1 stop

12h 35m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

1 stop

12h 15m
C$ 1,053

Aer Lingus

View Deal

Deal found 5/10/22

Direct flights to London from Seattle

Save time with Seattle to London direct flight deals
24 May - 14 Jun.
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 40m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

9h 45m
C$ 1,026

Delta

View Deal

Deal found 10/5/22

4 Oct. - 12 Oct.
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 45m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 20m
C$ 1,091

Delta

View Deal

Deal found 10/5/22

23 May - 30 May
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

Nonstop

9h 40m
LHR

London Heathrow

SEA

Seattle/Tacoma Intl

Nonstop

10h 10m
C$ 1,093

Delta

View Deal

Deal found 10/5/22

Last minute flights from Seattle to London

Late deals on round-trip flights to London from Seattle, departing today and this week
18 May - 26 May
SEA

Seattle/Tacoma Intl

LGW

London Gatwick

1 stop

12h 00m
LGW

London Gatwick

SEA

Seattle/Tacoma Intl

1 stop

12h 50m
C$ 1,077

Icelandair

View Deal

Deal found 10/5/22

18 May - 26 May
SEA

Seattle/Tacoma Intl

LGW

London Gatwick

1 stop

12h 00m
LGW

London Gatwick

SEA

Seattle/Tacoma Intl

1 stop

12h 50m
C$ 1,119

Icelandair

View Deal

Deal found 11/5/22

17 May - 26 May
SEA

Seattle/Tacoma Intl

LGW

London Gatwick

1 stop

12h 00m
LGW

London Gatwick

SEA

Seattle/Tacoma Intl

1 stop

12h 50m
C$ 1,154

Icelandair

View Deal

Deal found 10/5/22

One-way flights to London All airports from Seattle

The cheapest one-way flights from Seattle to London
30 Sep.
SEA

Seattle/Tacoma Intl

LGW

London Gatwick

2 stops

31h 45m
C$ 465

WestJet

View Deal

Deal found 12/5/22

3 Oct.
SEA

Seattle/Tacoma Intl

LHR

London Heathrow

2 stops

29h 06m
C$ 477

WestJet

View Deal

Deal found 9/5/22

20 May
SEA

Seattle/Tacoma Intl

LGW

London Gatwick

2 stops

29h 00m
C$ 478

WestJet

View Deal

Deal found 10/5/22

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?

Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to London. On average, Seattle/Tacoma Intl has 18 outbound flights to London per day from 7 airlines. Seattle/Tacoma Intl is conveniently located just 18.4 km from Seattle’s city centre.

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

Virgin Atlantic, Iberia, 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 C$ 1,000 on Cheapflights?

Yes, there are multiple flights from Seattle to London for under C$ 1,000. The cheapest flight booked recently is on Aer Lingus for just C$ 926, but on average you can expect to pay C$ 1,006.

Are there direct flights from Seattle to London for under C$ 1,100 on Cheapflights?

Cheapflights has 20 direct flights from Seattle to London under C$ 1,100. A good price for a direct flight from Seattle to London is less than C$ 1,225.

Are there last-minute flights available from Seattle to London for under C$ 1,100?

There are currently 20+ open flights from Seattle to London within the next 7 days for less than C$ 1,100.

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

According to our current data, Aer Lingus (C$ 926), Icelandair (C$ 993), and Virgin Atlantic (C$ 1,001) offers the cheapest pricing from Seattle to London.

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

Consider British Airways, Icelandair or Iberia when booking your flight. These represent the most popular airlines when flying from Seattle to London.

What are the most reliable airlines from Seattle to London?

The top 3 most reliable airlines when flying from Seattle to London are Air France (80%), Alaska Airlines (80%) and American Airlines (72%).

What are the cheapest flights from Seattle to London?

Looking at all options, your cheapest flight can be booked for C$ 2,333. While the most popular route (Seattle/Tacoma Intl - London Heathrow) can be booked for C$ 1,347 on average our data indicates C$ 3,680 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.
Seattle to Manchesterfrom C$ 1,757 pp

Top 3 airlines flying from Seattle to London

The chart below displays the airlines Cheapflights users travelling 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
Virgin AtlanticCheapestC$ 546AverageC$ 818FlexibilityNo cancel feeOn-time72%COVID-19 safety
Search Virgin Atlantic flights
IcelandairCheapestC$ 560AverageC$ 693FlexibilityNo cancel feeOn-time76%COVID-19 safety
Search Icelandair flights
IberiaCheapestC$ 566AverageC$ 699FlexibilityNo cancel feeOn-time77%COVID-19 safety
Search Iberia 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
41%of flight departuresAfternoonNoon to 6 pm
58%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
Sunday14daily flights
Monday20daily flights
Tuesday20daily flights
Wednesday14daily flights
Thursday20daily flights
Friday20daily flights
Saturday20daily flights