Cheapest€663.30
- Alaska Airlines AA155609:0711h 52m20:59Seattle BFISeoul ICN
Door to door 15h 2mCO2 1268.7 kgChanges 0Fixed, no changes
Seattle to Seoul flight
Flights from Seattle to Seoul start at €786.61 and take 14h 30m at their fastest.
The Flights from Seattle to Seoul starts at €786.61 and takes 14h 30m door to door, run by 3 operators over 8,572 km, with around 21 departures a day. Fares bottom out about 60 days before departure.
- 14h 30mDoor to door
- 11h 20mMoving
- €786.61From
- 1268.7 kgCO2
The cheapest and the fastest on September 29, 2026
Two journeys we can sell today, with the service number each operator files them under.
Fastest€669.20
- Korean Air KA843714:4111h 20m02:01Seattle BFISeoul ICN
Door to door 14h 30mCO2 1268.7 kgChanges 0Fixed, no changes
Airlines
Speed, flexibility and what is on board. Nothing here is a rating, because we have not earned one.
| Operator | From | Fastest |
|---|---|---|
 Alaska Airlines | €663.30 | 14h 20m |
 Korean Air | €669.20 | 14h 19m |
 Asiana Airlines | €666.84 | 14h 19m |
That is the traveling done. What happens after you walk out into Seoul is not something we sell.
Looking for somewhere to stay in Seoul?
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When to book Seattle to Seoul
The same search run across the whole booking window, so the shape of the curve is visible rather than described.
- €842.0790 days
- €504.0060 days
- €535.8645 days
- €641.4730 days
- €805.4921 days
- €836.7614 days
- €984.267 days
- €1,027.923 days
- €1,538.271 days
- Cheapest lead time
- Fares bottom out around 60 days ahead, at €504.00.
- How much it moves
- The gap between the cheapest and most expensive lead time is 205 percent. The most expensive point is €1,538.27, 1 days out.
- What that means
- Today sits inside the cheap window, which closes about 60 days before departure. Waiting from here has usually cost money on this corridor rather than saved it.
Which departure day costs least
Median cheapest fare for each weekday, taken across the next three weeks of real prices.
- €932.93Sun
- €850.64Mon
- €786.61Tue
- €803.89Wed
- €1,098.13Thu
- €836.76Fri
- €1,020.25Sat
Where you leave from and where you arrive
The stations, airports and ports each mode on this corridor actually uses.
Seattle
Air
- SEA
- BFI
Seoul
Air
- ICN
- GMP
What the journey actually looks like
Direct or connecting, how far the route really runs, and what happens when a connection is missed.
- Direct or connecting
- 82% of the services we sell on this corridor run through without a change. The remaining 18% involve one connection.
- How far it really runs
- The route covers 8,572 km against 8,322 km in a straight line, a detour of 3 percent. Track and road geometry account for the difference.
- Where the change is
- Connections are made at Vancouver, Anchorage, Portland, Tokyo. The gap between arriving and leaving is 53 minutes, of which about 14 is walking.
- If the connection is missed
- The tightest connection we sell here has a 18 percent chance of not being made on the timetable alone. Part of this journey is a self transfer between separate tickets, so leave more time than the minimum and expect to check in again.
- First and last departure
- The first service of the day leaves Seattle at 06:03 and the last at 19:45, across 21 departures. The return direction keeps its own timetable, so the times back are not these times reversed.
Questions about Seattle to Seoul
The questions people actually ask about this trip, answered from the same prices and times the page above is built on rather than written once and left to go stale.
How long does the Flight from Seattle to Seoul take?
The Flight from Seattle to Seoul takes 14h 30m door to door, of which 11h 20m is spent moving. The route runs 8,572 km. The difference between the two times is reaching the terminal and leaving it at the far end, which every time on this page includes.
How much does the Flight from Seattle to Seoul cost?
The Flight from Seattle to Seoul starts at €786.61 for one passenger, checked on September 29, 2026. A typical fare is €791.33. Both are the total including taxes, supplier fees and our service fee, so the price here is the price at checkout.
Who runs the Flight from Seattle to Seoul?
3 operators run the Flight from Seattle to Seoul: Alaska Airlines, Korean Air, Asiana Airlines. Between them they file around 21 departures a day. The operator table on this page compares them on fare, journey time, cruising speed, fare conditions and what is provided on board.
Which terminal does the Flight from Seattle to Seoul use?
The Flight from Seattle to Seoul leaves from Seattle BFI and arrives at Seoul ICN. Allow about 3h 10m for reaching the departure terminal and leaving the arrival one. That time is already inside every door to door figure quoted on this page.
When should I book the Flight from Seattle to Seoul?
Fares for the Flight from Seattle to Seoul bottom out around 60 days ahead, at €504.00. The gap between the cheapest and most expensive lead time across the window is 205 percent, measured on September 29, 2026. Booking inside the final week has consistently cost more.
How much CO2 does the Flight from Seattle to Seoul produce?
The Flight from Seattle to Seoul produces about 1268.7 kg of CO2 per passenger over 8572 km, which works out at roughly 148 grams per passenger kilometer. That figure is for the whole journey and for one traveler, not for the vehicle.
Where these numbers come from
Observed service A carrier record shows this named operator serving this named pair, and we carry that through unchanged.
Schedules, seat counts and fares are generated by our own model until the supplier contracts are signed. Places, coordinates, operators, which operator serves which pair, and every distance are real. We would rather say that on every page than let a modeled number pass for a filed one.
Defined in full at Door to door, Fares, The booking window, Carbon
- On this page
- Every figure above was computed for Seattle to Seoul on September 11, 2026: 8572 km of route against 8322 km in a straight line, 21 services a day, 3 operators, a cheapest fare of €786.61, and 14h 30m door to door on the fastest mode. The return direction is computed separately and its numbers are not these numbers.
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