Cheap flights from Seattle (SEA) to London (LON)
The best prices from Seattle/Tacoma Intl to London are usually found in October or January, booked 60 days in advance, depart on a Tuesday or Monday 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 | $487 - $787 |
LON | Temperature | 39.2 - 62.6 °F |
LON | Precipitation | 1.6 - 2.8 inches |
Popular in
December
High demand for flights, 27% potential price rise
Cheapest in
October
Best time to find cheap flights, 15% potential price drop
Round-trip from
$487
From Seattle/Tacoma Intl to London (LON)
One-way from
$304
One-way flight from Seattle/Tacoma Intl to London (LON)
What is the cheapest day to fly round-trip from Seattle to London?
Thursday 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 61 days in advance, which can save you up to 75% on flights from Seattle to London compared to booking the week you need them. Waiting 61 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 $820. For sooner than that we have options available in the next 3 days from $1,079.
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 $575 per person but you can even find prices for as low as $416. 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 October
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 in the evening could potentially save you up to 6% on airfare.
Cheap flights from Seattle to London in January, February 2022
The best prices found for SEA to LON flights for January, February
Seattle/Tacoma Intl
London Stansted
2 stops
22h 10mLondon Stansted
Seattle/Tacoma Intl
2 stops
22h 31mMultiple Airlines
Seattle/Tacoma Intl
London Stansted
2 stops
22h 10mLondon Stansted
Seattle/Tacoma Intl
2 stops
22h 31mMultiple Airlines
Seattle/Tacoma Intl
London Heathrow
2 stops
21h 15mLondon Heathrow
Seattle/Tacoma Intl
2 stops
34h 10mMultiple Airlines
Seattle to London 2022 flight deals
Cheap flights to London from Seattle found for this year
Seattle/Tacoma Intl
London Stansted
2 stops
22h 10mLondon Stansted
Seattle/Tacoma Intl
2 stops
22h 31mMultiple Airlines
Seattle/Tacoma Intl
London Stansted
2 stops
23h 15mLondon Stansted
Seattle/Tacoma Intl
2 stops
22h 27mMultiple Airlines
Seattle/Tacoma Intl
London Stansted
2 stops
22h 10mLondon Stansted
Seattle/Tacoma Intl
2 stops
22h 31mMultiple Airlines
Non-stop flights to London from Seattle
Save time with Seattle to London direct flight deals
Seattle/Tacoma Intl
London Heathrow
Nonstop
9h 25mLondon Heathrow
Seattle/Tacoma Intl
Nonstop
9h 45mMultiple Airlines
Seattle/Tacoma Intl
London Heathrow
Nonstop
9h 15mLondon Heathrow
Seattle/Tacoma Intl
Nonstop
10h 05mBritish Airways
Seattle/Tacoma Intl
London Heathrow
Nonstop
9h 15mLondon Heathrow
Seattle/Tacoma Intl
Nonstop
10h 05mFinnair
Last minute flights from Seattle to London
Late deals on return flights to London from Seattle, departing today and this week
Seattle/Tacoma Intl
London Gatwick
2 stops
21h 55mLondon Gatwick
Seattle/Tacoma Intl
2 stops
31h 50mMultiple Airlines
Seattle/Tacoma Intl
London Heathrow
2 stops
23h 40mLondon Heathrow
Seattle/Tacoma Intl
2 stops
38h 49mMultiple Airlines
Seattle/Tacoma Intl
London Heathrow
2 stops
23h 40mLondon Heathrow
Seattle/Tacoma Intl
2 stops
23h 04mMultiple Airlines
One-way flights to London All airports from Seattle
The cheapest one-way flights from Seattle to London
Seattle/Tacoma Intl
London Gatwick
2 stops
60h 25mWestJet
Seattle/Tacoma Intl
London Heathrow
3 stops
36h 28mMultiple Airlines
Seattle/Tacoma Intl
London Heathrow
3 stops
36h 28mMultiple Airlines
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 9 flights from Seattle/Tacoma Intl to London per day from 19 different airlines.
Which airlines flying from Seattle/Tacoma Intl to London have flexible cancellations due to COVID-19?
Delta, Virgin Atlantic, and British Airways 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 Multiple Airlines for just $521, but on average you can expect to pay $546.
Are there nonstop flights from Seattle to London for under $700 on Cheapflights?
Cheapflights has at least 20 direct flights from Seattle to London under $700. A good price for a nonstop flight from Seattle to London is less than $707.
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 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: Major Airline, American Airlines or Air Canada.
What are the most reliable airlines from Seattle to London?
Consider Aer Lingus (62%), American Airlines (62%) or Finnair (62%) 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 $328. While the most popular route (Seattle/Tacoma Intl - London Heathrow) can be booked for $542 on average our data indicates $1,431 when flying from Seattle to London.
Other flights from Seattle
Can I fly to London from Seattle/Tacoma Intl right now?
Most visitors from Seattle/Tacoma Intl need to provide a negative COVID-19 test result and/or quarantine to enter London.
COVID-19 testing requirements
Visitors from Seattle/Tacoma Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 48 hours before departing to London.
Quarantine requirements
Visitors from Seattle/Tacoma Intl are not required to quarantine after entering London.
Documents
Mandatory passenger locator form - Submit the form any time in the 48 hours before arriving in the UK. Show the form when checking in your plane, train or ferry to the UK.
Managed quarantine package for Scotland - All travelers arriving directly to Scotland are required to book their Managed Quarantine Package prior to travel.
COVID-19 testing package - All travelers must book and pay for a COVID-19 Testing Package prior to travel to England and Scotland.
Can I fly back to Seattle/Tacoma Intl from London?
COVID-19 testing requirements
Visitors from London must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 24 hours before departing to Seattle/Tacoma Intl.
Quarantine requirements
Visitors from London are not required to quarantine after entering Seattle/Tacoma Intl.
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.
Hourly flight availability from Seattle to London
See what time of day planes typically take off from Seattle to London
| 1%of flight departures | Early morningMidnight to 6 am |
|---|---|
| 0%of flight departures | Morning6 am to noon |
| 41%of flight departures | AfternoonNoon to 6 pm |
| 58%of flight departures | Evening6 pm to midnight |
Weekly flight availability from Seattle to London
See how many times per day planes take to the skies headed from Seattle to London
| Sunday | 10daily flights |
|---|---|
| Monday | 10daily flights |
| Tuesday | 5daily flights |
| Wednesday | 10daily flights |
| Thursday | 10daily flights |
| Friday | 10daily flights |
| Saturday | 10daily flights |