Seattle to Seoul SEA → ICN
Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN)
The cheapest return found recently is $911 with Cathay Pacific, 22 Apr 2027 – 20 May 2027, found yesterday. The cheapest one-way found recently is $418 with Cathay Pacific, 13 Jan 2027, found yesterday.
Return
The cheapest return fare on each of 4 departure dates is usually $1,021 to $1,917.
Cheapest return found recently
$911
22 Apr 2027 – 20 May 2027 · Cathay Pacific
Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN)
Leaves 11:45 a.m. · Return leaves 8:00 a.m. · 36 h 45 min of travel, both ways together
out 1 stop, back 1 stop
found yesterday
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$911 22 Apr 2027 – 20 May 2027found yesterdaySee prices for these dates
It is also the cheapest return we hold, of any age.
What have prices looked like?
Over 17 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $851 to $2,969.
17 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good return price?
Compared with the cheapest return fare on each of 4 departure dates from 13 Dec to 16 Jun 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
We hold no other 28-night return fares leaving within 3 days of 22 Apr 2027 to compare.
Every date we hold
4 fares on 4 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 13 Dec – 2 Jan 2027 | $2,110 | Alaska Airlines | Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
| 20 Dec – 30 Dec | $1,853 | Alaska Airlines | Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN) | out 1 stop, back 2 stops | found 4 days ago | See prices for these dates |
| 22 Apr 2027 – 20 May 2027 | $911 | Cathay Pacific | Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN) | out 1 stop, back 1 stop | found yesterday | See prices for these dates |
| 16 Jun 2027 – 15 Jul 2027 | $1,058 | Cathay Pacific | Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
Which month looks cheapest?
April 2027 is the cheapest month — from $911.
Airlines on the cheapest dates: Alaska Airlines, Cathay Pacific.
One-way
Not enough comparable prices yet for a usual one-way price.
Cheapest one-way found recently
$418
13 Jan 2027 · Cathay Pacific
Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN)
Leaves 10:25 a.m. · 21 h 15 min trip
1 stop
found yesterday
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$418 13 Jan 2027found yesterdayOpen this trip
It is also the cheapest one-way we hold, of any age.
What have prices looked like?
Over 22 days, 24 Sept to 18 Oct, the cheapest one-way we saw each day was $418 to $1,498.
At $418, the cheapest one-way found recently is at the low end of that range.
22 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good one-way price?
Not enough comparable prices yet: we hold one-way fares on 2 departure dates and need at least 3 to say what is usual.
Could nearby dates be cheaper?
We hold no other one-way fares leaving within 3 days of 13 Jan 2027 to compare.
Every date we hold
2 fares on 2 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 13 Jan 2027 | $418 | Cathay Pacific | Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN) | 1 stop | found yesterday | Open this trip |
| 6 May 2027 | $550 | Cathay Pacific | Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN) | 1 stop | found 6 days ago | Open this trip |
Which month looks cheapest?
January 2027 is the cheapest month — from $418.
Airlines on the cheapest dates: Cathay Pacific.
Premium cabin fares from Seattle to Seoul
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 22 Apr 2027 – 20 May 2027 in another cabin: Premium economy · Business · First
Today's prices for 13 Jan 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Seattle to Seoul?
Return
Not enough history yet: in 17 days of return prices, 24 Sept to 18 Oct, fewer than 3 booking ranges had prices on 7 days or more.
One-way
Fares 180 or more days before departure were typically 60% lower than 60 to 89 days before departure.
From the cheapest one-way each day between 24 Sept and 18 Oct (22 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 60–89 days | $1,068 | $418 | +147% | 10 |
| 90–179 days | $1,552 | $1,068 | +259% | 8 |
| 180+ days | $433 | $431 | Cheapest seen | 16 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Everett → Seoul
34 km from Seattle
$1,321
$410 more than flying from Seattle
1 Dec – 7 Dec · PAE → ICN · out 2 stops, back 1 stop
found yesterday
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Everett → Seoul
34 km from Seattle
$578
$160 more than flying from Seattle
13 Jan 2027 · PAE → ICN · 2 stops
found yesterday
Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 22 Apr 2027 – 20 May 2027. A live search on this page shows what those dates cost now, for one adult in economy.
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work