Seattle → Seoul flights

Target $427–$457 on Seattle–Seoul; avoid peak windows near $621

Key takeaways

• Median fare is $457, based on 30 daily snapshots of the cheapest available cached fares on this route.
• Bottom-quartile fares fall at or below $427 — that's a realistic savings target, not a lucky outlier.
• The spread is 72% (low $362, high $621), meaning timing your booking meaningfully affects what you pay — this is a high-variance route.
• The $362 floor does exist, but it represents the cheapest single observation; treat it as a ceiling for exceptional deals rather than a planning benchmark.
• Fares above $555 (p75) suggest you're booking into a demand spike — if you're seeing that, consider flexibility on travel dates if possible.

30-day price trend

See full numbers and stats on the SEA → ICN price history page.

The full picture

Seattle–Seoul is a competitive transpacific corridor, and the 72% price spread across our 30-day snapshot window tells a clear story: this route has real pricing variance, which means timing matters. The interquartile range of $427–$555 is where most shoppers will land, and the $457 median is a credible anchor for budgeting. The $362 low is real but rare — appearing at one end of the distribution — so building a trip budget around it would be optimistic. A more defensible target is anywhere at or below the $427 p25 mark.

On transpacific routes generally, fares tend to soften in the 6–10 week booking window before departure, as airlines balance load factors against remaining inventory. Fares in the final two to three weeks before departure on a popular route like SEA–ICN typically firm up as seat availability tightens, which aligns with why the high end of this dataset reaches $621. If your schedule allows, monitoring fares in the 45–70 day range before departure and acting when prices approach $427 or below is a reasonable strategy backed by this data's distribution.

No dominant carrier signal is visible in the data provided, so we can't reliably attribute low-fare windows to a specific airline's pricing behavior. Similarly, day-of-week booking patterns are not resolvable from daily snapshot data alone — claims that 'Tuesday is cheapest to book' are not supported here. The honest caveat: 30 samples captures a meaningful distribution, but it reflects one rolling window in time. Seasonal demand shifts — summer travel peaks, Korean holidays, major events in Seoul — can push the entire distribution upward in ways this snapshot may not fully represent. Treat the $427 p25 as your action threshold, and be prepared to move when you see it.

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