SEA → ICN
The quiet corridor where three carriers price against each other
Reviewed September 2026
Estimated fare, this region pair
from ~$3,000 round trip
Approximate, per seat, not a quote. Your dates are priced by hand.
- Westbound block time
- ~11h30m
- Carriers competing
- 3
- JV joining two of them
- 1
- Typical saving vs published
- 30-40%
Seattle to Seoul is the Pacific Northwest’s best-served route into Asia. Korean Air and Asiana fly it as a home corridor, Delta joins from its trans-Pacific hub build-out, and the Delta-Korean joint venture ties the pricing together. Incheon’s connection bank then opens most of Asia one stop later.
Published business fares hold in the $5,000 to $6,500 band. Negotiated pricing typically lands between $2,800 and $3,900, and the three-way competition keeps allocations honest year-round in a way single-carrier corridors never manage.
The flight runs about eleven and a half hours westbound. Incheon rewards the arrival: transit is fast, the lounges are genuinely good, and onward departures to Southeast Asia leave through the evening, which makes Seattle-to-Singapore-by-morning a civilised proposition.
Seattle to Seoul: route facts
- Distance
- 5,203 mi · 8,373 km
- Time in the air, direct
- about 9h30–11h45
- Time difference
- Seoul is 16–17 h ahead of Seattle, depending on daylight saving
- Seattle airport
- SEA
- Seoul airports
- ICN · GMP
Distance is great-circle between SEA and ICN; time in the air is estimated for that direct line. It is a band, not a schedule: eastbound and westbound differ with the jet stream, a connection adds its own hours, and the timetable for your date is what we quote.
Seattle to Seoul: common questions
Korean, Asiana or Delta out of Seattle?
Korean’s newest cabins set the pace, Asiana remains solid as the merger integration proceeds, and Delta One prices keenly inside the joint venture. Product differences are modest; we usually let the day’s contract space pick and tell you what you are getting.
Is Seoul a good connecting point compared with Tokyo?
For Southeast Asia, often better: Incheon’s evening bank turns the layover into two or three hours rather than an overnight, and through-fares on the same ladder price generously. For Japan itself, obviously fly direct.
How does the Asiana merger affect booking this route?
Fleet and schedule assignments are consolidating, so cabin equipment on a given frequency can change between booking and flying. We verify the aircraft at booking and monitor it, which is exactly the kind of churn a specialist absorbs so you do not.