July is the cheapest month to fly this route, with average fares around $1158 round trip.
Average round-trip fares by departure month, based on current availability.
| Month | Avg Price | Lowest | Relative Cost | |
|---|---|---|---|---|
| May 2026 | $1436 | $1363 | ||
| June 2026 | $1470 | $1268 | Peak | |
| July 2026 | $1158 | $906 | Best | |
| August 2026 | $1337 | $1335 |
Departing on Friday offers the lowest average fares at $1299. Monday departures are the most expensive at $1361, a difference of $62.
The best time to fly is July. Set up an alert and we'll notify you when prices drop.
Get Started Free →The cheapest month to fly from Seattle to Seoul is July, with average round-trip fares around $1158. The lowest fare found in July is $906.
Friday departures are the cheapest, averaging $1299 round trip. The most expensive day is Monday at $1361.
Based on current pricing trends, booking for July travel offers the best value. Avoid June if possible, as fares average $1470 compared to $1158 in the cheapest month. May is a solid middle-ground option at $1436.
Flying in July instead of June can save you approximately $312 per round trip. The cheapest month averages $1158 while the most expensive averages $1470.
Airlines, flight times, price calendar, and more for Seattle to Seoul
View SEA → ICN Details