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ORD–ICN fares median $523 over 30 days, with a 67% spread; shop around and aim for the bottom quartile near $488.
Written from this route's 30-day price index (30 daily samples). Article last regenerated Oct 17, 2026.
See full numbers and stats on the ORD → ICN price history page.
The 67% spread between this route's low ($408) and high ($683) fares is wide, signaling real volatility in Chicago–Seoul pricing over the 30-day sample. That's a meaningfully larger range than you'd see on a stable domestic route, and it suggests fare caching and dynamic pricing are doing a lot of work here — the same itinerary can look very different depending on when you check. With a median of $523 and a bottom quartile of $488, a fare in the high $400s is a reasonable target, while anything creeping past $592 (the 75th percentile) is on the expensive side for this route.
We don't have booking-window data (days-until-departure) in this snapshot set, only 30 days of observed cached fares, so we can't credibly say prices soften at a specific point before departure — that would be guessing. What we can say is that the gap between the median and the low end ($115) is large enough that patient, repeated searching is likely to pay off more than booking on the first fare you see. If your travel dates have any flexibility, checking across multiple days before committing gives you a real shot at landing closer to the $488 quartile than the $523 median.
No single carrier stood out clearly enough in this data to call a dominant airline pattern, and we didn't see day-of-week fare data, so we're not making claims there. The honest caveat: this is a 30-day cached-fare sample, not real-time search results, and it reflects what fares *looked like* over that window rather than a guarantee of what you'll find today. Long-haul international routes like this one are also prone to sudden fare sales that can undercut even the low end we observed, so treat these numbers as a grounded reference point, not a ceiling or floor.
Why we regenerated this article: Price spread widened by 18 points. We only rewrite when the underlying price index actually moves — stable weeks keep the previous take.
AI-authored from this route's 30-day price index. Article last regenerated Oct 17, 2026. Fares shift continuously — confirm at booking.