Seattle to Seoul Incheon (SEA → ICN). We are tracking 23 fares on this route.
Cheapest tracked fare $425 · typical price $704 · you save about $279 (40%)
Cheapest fares we're tracking
Airline
Departs
Stops
Price
Cathay Pacific
2026-09-24
1 stop
$425
Cathay Pacific
2026-09-16
1 stop
$449
Cathay Pacific
2026-09-17
1 stop
$450
Cathay Pacific
2026-11-30
1 stop
$450
China Airlines
2026-10-05
1 stop
$465
Frontier Airlines
2026-09-19
1 stop
$465
China Airlines
2026-11-18
1 stop
$466
Hainan Airlines
2026-09-10
1 stop
$468
Frontier Airlines
2026-09-29
2 stops
$479
Frontier Airlines
2026-09-28
3 stops
$496
Hainan Airlines
2026-10-01
1 stop
$496
Frontier Airlines
2026-09-13
2 stops
$503
China Airlines
2026-11-11
1 stop
$512
China Airlines
2026-09-30
1 stop
$512
China Airlines
2026-11-10
1 stop
$512
Alaska Airlines
2026-10-07
1 stop
$515
WestJet
2026-10-23
1 stop
$523
Frontier Airlines
2026-11-05
2 stops
$535
Frontier Airlines
2026-09-27
2 stops
$563
United Airlines
2026-10-15
2 stops
$564
Could you save more?
The airport you were going to fly from is often not the cheapest one. Compare every airport in a region against each other, or check whether a multi-day stopover beats the direct fare.
How cheap can flights from Seattle to Seoul Incheon get?
The cheapest fare we have tracked on this route is $425, compared with a typical $704 for a trip of this distance.
Is it cheaper to fly to Seoul Incheon from a different airport?
Often, yes. Fares out of secondary airports are frequently cheaper than the obvious hub, but they are the ones most likely to be missing from a normal search. Our reverse search compares every airport in a region against each other so the cheaper departure point is not hidden.
Could a stopover make Seattle to Seoul Incheon cheaper?
Sometimes. On thin long-haul routes a two-leg trip with a multi-day stopover can beat the direct fare, and occasionally a direct fare is not sold at all. Our detour search prices those routings against the direct flight.