London to Seattle flights
Routavio compares airline fares from several flight booking sites. The lowest one-way fare it found for London to Seattle is €411 with Icelandair (checked on 5 Nov 2026).
Your next trip, last seen at €411
Lowest observedIcelandair · 1 stop · One wayWhen to fly
Explore datesMore dates worth a look
Find the dates that work for you
The lowest fare we observed for each month. Open a month to see its days, then pick your outbound and return. A day with no price is one we will search for you.
One-way fare
- Lowest observed
- €411, departing 31 Mar 2027 (Last checked: 5 Nov 2026)One-way fare · Priced departure days checked in the last 14 days: 33Check live prices for this route
- Non-stop, one way
- €470, departing 16 Mar 2027 (Last checked: 6 Nov 2026)
- Airlines seen
- Air France, Alaska Airlines, KLM, Air Canada, American Airlines, Icelandair, Lufthansa, Lufthansa City Airlines, United Airlines (9)
- Fastest observed flight time
- 10h 05m
- Non-stop
- Yes
About this route
Explore the fares we observed from London to Seattle. Prices move often, so pick your dates to see the latest options.
- Route distance
- 7,700 km
- Fastest observed flight time
- 10h 05m
- Airlines seen
- Air France, Alaska Airlines, KLM, Air Canada, American Airlines, Icelandair, Lufthansa, Lufthansa City Airlines, United Airlines (9)
- Alternative airports
- LCY, LGW, LTN, SEN, STN, BFI
Route-level information; individual journeys vary.
A clearer picture of your fare
If the observed fare for this date drops, we will email you. At most one message a day.
Non-stop airlines seen on this route
| Airline | Non-stop days / priced days |
|---|---|
| Alaska Airlines | 64 / 112 |
| KLM | 11 / 112 |
| Air France | 4 / 112 |
Departure days with a non-stop fare checked in the last 14 days. A carrier listed here had a non-stop fare on at least 3 days; schedules may differ.
Airport to city: straight-line distance
- London City Airport (LCY) → London, city gazetteer reference point (51.5074, -0.1278): ≈ 13 km.
- London Heathrow (LHR) → London, city gazetteer reference point (51.5074, -0.1278): ≈ 23 km.
- London Gatwick (LGW) → London, city gazetteer reference point (51.5074, -0.1278): ≈ 40 km.
- London Luton (LTN) → London, city gazetteer reference point (51.5074, -0.1278): ≈ 44 km.
- London Stansted (STN) → London, city gazetteer reference point (51.5074, -0.1278): ≈ 49 km.
- London Southend Airport (SEN) → London, city gazetteer reference point (51.5074, -0.1278): ≈ 57 km.
- King County International Airport - Boeing Field (BFI) → Seattle, city gazetteer reference point (47.6062, -122.3321): ≈ 9 km.
- Seattle–Tacoma International Airport (SEA) → Seattle, city gazetteer reference point (47.6062, -122.3321): ≈ 18 km.
Approximate distances calculated from coordinates, not road distances or travel times. These airports serve the city; they are not confirmed endpoints of an offer.
Lowest fare by departure month
| Month | Lowest fare | Priced days |
|---|---|---|
| November 2026 | €487 | 9 |
| December 2026 | €536 | 12 |
| January 2027 | €439 | 12 |
Lowest fare by day of the week
Cheapest Tuesday departure we saw from London to Seattle: 19 Jan 2027, €439 (checked 11 Nov 2026).
| Day | Lowest fare | Priced days |
|---|---|---|
| Monday | €442 | 4 |
| Tuesday | €439 | 5 |
| Wednesday | €439 | 5 |
| Thursday | €442 | 4 |
| Friday | €442 | 4 |
| Saturday | €442 | 6 |
| Sunday | €441 | 5 |
One-way fares checked in the last 14 days. Each figure is the lowest priced departure day we saw, not a guaranteed fare.
Observed fares by departure date
| Departure | Fare | Seen on |
|---|---|---|
| €542 | 5 Nov 2026 | |
| €487 | 12 Nov 2026 | |
| €483 | 5 Nov 2026 | |
| €568 | 12 Nov 2026 | |
| €568 | 12 Nov 2026 | |
| €568 | 12 Nov 2026 | |
| €568 | 12 Nov 2026 | |
| €568 | 12 Nov 2026 | |
| €568 | 12 Nov 2026 | |
| €568 | 12 Nov 2026 | |
| €568 | 12 Nov 2026 | |
| €638 | 5 Nov 2026 | |
| €444 | 5 Nov 2026 | |
| €536 | 12 Nov 2026 | |
| €536 | 12 Nov 2026 | |
| €536 | 12 Nov 2026 | |
| €536 | 12 Nov 2026 | |
| €536 | 12 Nov 2026 | |
| €536 | 12 Nov 2026 | |
| €411 | 5 Nov 2026 |
One-way fares. Each row is one price we saw for that departure day on the date shown, not a guaranteed fare.
Lowest fare by days before departure
Lowest fare from London to Seattle by days until departure (61 days or more): €439 (checked 11 Nov 2026).
| Days before departure | Lowest fare | Priced days |
|---|---|---|
| 0 to 7 days | €487 | 3 |
| 8 to 30 days | €536 | 17 |
| 61 days or more | €439 | 12 |
One-way fares checked in the last 14 days. Each figure is the lowest stored fare for that distance to departure, not a price forecast.
Fares for different departure dates, checked now; not a guide to when to book.
Lowest one-way fare we saw per airline
Cheapest airline from London to Seattle: Icelandair, €411 (checked 6 Nov 2026).
| Airline | Lowest fare | Priced days |
|---|---|---|
| Icelandair | €411Mar 31, 2027 | 8 |
| Alaska Airlines | €470Mar 16, 2027 | 65 |
| KLM | €478Dec 25, 2026 | 12 |
| Air France | €496Feb 6, 2027 | 4 |
One-way fares checked in the last 14 days. An airline listed here had a fare on at least 3 departure days. Each figure is the lowest we saw, not a guaranteed fare. Connecting itineraries are included; the date is the departure day of that fare.
Frequently asked
How much is a flight from London to Seattle?
The lowest fare Routavio has observed is €411, found on 5 Nov 2026.
Are there direct flights from London to Seattle?
Yes. Published schedules report non-stop flights on this route with Air France, Alaska Airlines, KLM, British Airways.
Which airlines fly from London to Seattle?
Routavio has seen these carriers on the route: Air France, Alaska Airlines, KLM, Air Canada, American Airlines, Icelandair, Lufthansa, Lufthansa City Airlines, United Airlines (9).
How long does the flight from London to Seattle take?
Across the 77 fares Routavio observed, the average journey time is 11h 38m, including any stops. Individual departures vary; the fastest observed flight is listed in the route facts above.
How many of the observed London to Seattle fares were non-stop?
68 of the 86 fares we observed were non-stop; the rest included at least one stop. That describes our observations, not every flight that operates.
How much is a non-stop flight from London to Seattle?
Cheapest non-stop one-way fare: €470, departing 16 Mar 2027 (checked 6 Nov 2026).
Which airlines had non-stop offers on at least 3 departure dates from London to Seattle?
For London to Seattle, examples of observed one-way non-stop offers checked within the last 14 days: Alaska Airlines (64), KLM (11), Air France (4). Each number counts distinct departure dates, not weekly flights; check current availability in search.
Which day of the week is cheapest from London to Seattle?
Cheapest Tuesday departure we saw from London to Seattle: 19 Jan 2027, €439 (checked 11 Nov 2026).
Which airline has the lowest fare from London to Seattle?
Cheapest airline from London to Seattle: Icelandair, €411 (checked 6 Nov 2026).
How observed prices work, what "No data" means and what a fare includes: Read the flight price guide · Price and schedule freshness on Routavio
Keep exploring
Similar routes
Non-stop airlines on this route
More routes from London
Show all 36 routes →Show fewer ↑
More routes to Seattle
Show all 36 routes →Show fewer ↑
Recently observed fares. Prices may change.