Cheap flights from Seattle to Seoul from $508 BFI, SEA → GMP, ICN
Boeing Field International Airport (BFI), Seattle-Tacoma International Airport (SEA) → Gimpo International Airport (GMP), Incheon International Airport (ICN)
The cheapest return found recently is $840 with Cathay Pacific, 18 Jan 2027 – 2 Feb 2027, found yesterday. The cheapest one-way found recently is $508 with Singapore Airlines, 23 Apr 2027, found yesterday.
- Cheapest one-way found recently
- $508, found yesterday
- Cheapest return found recently
- $840, 18 Jan 2027 to 2 Feb 2027
- Usual return price
- $868 to $978
- Cheapest month to fly
- January 2027, return fares from $840 found in the last 7 days
- Airlines with nonstop flights
- Korean Air
Return
The cheapest return fare on each of 3 departure dates is usually $868 to $978.
Cheapest return found recently
$840
18 Jan 2027 – 2 Feb 2027 · Cathay Pacific
Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN)
Leaves 10:25 a.m. · Return leaves 1:55 a.m. · 45 h 5 min of travel, both ways together
out 1 stop, back 1 stop · via Hong Kong International Airport (HKG) · overnight connection · 8 h connection
found yesterday
Cheapest nonstop return
$1,089
18 Jan 2027 – 2 Feb 2027 · Korean Air
Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN)
Leaves 12:10 a.m. · Return leaves 7:10 a.m. · 22 h of travel, both ways together
out nonstop, back nonstop
found yesterday
Found recently, and the cheapest we hold
$840 18 Jan 2027 – 2 Feb 2027found yesterdaySee prices for these dates
It is also the cheapest return we hold, of any age.
What have prices looked like?
Over 42 days, 24 Sept to 12 Nov, the cheapest return we saw each day was $840 to $2,969.
At $840, the cheapest return found recently is at the low end of that range.
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 3 departure dates from 5 Jan 2027 to 23 Apr 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 15-night return fares leaving within 3 days of 18 Jan 2027 to compare.
Every date we hold
24 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 5 Jan 2027 – 26 Jan 2027 | $896 | Cathay Pacific | Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN) | out 1 stop, back 1 stop | found 3 days ago | See prices for these dates |
| 18 Jan 2027 – 2 Feb 2027 | $840 | Cathay Pacific | Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN) | out 1 stop, back 1 stop | found yesterday | See prices for these dates |
| 23 Apr 2027 – 21 May 2027 | $1,059 | Alaska Airlines | Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN) | out 2 stops, back 1 stop | found yesterday | See prices for these dates |
Which month looks cheapest?
January 2027 is the cheapest month — from $840.
Airlines on the cheapest dates: Cathay Pacific, Alaska Airlines.
One-way
The cheapest one-way fare on each of 3 departure dates is usually $485 to $511.
Cheapest one-way found recently
$508
23 Apr 2027 · Singapore Airlines
Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN)
Leaves 10:15 a.m. · 51 h 15 min trip
2 stops
found yesterday
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$508 23 Apr 2027found yesterdayOpen this trip
$462 6 Jan 2027found 5 days agoOpen this trip
What have prices looked like?
Over 38 days, 24 Sept to 12 Nov, the cheapest one-way we saw each day was $418 to $1,498.
Those were the prices on those days, not today's.
Is this a good one-way price?
Compared with the cheapest one-way fare on each of 3 departure dates from 6 Jan 2027 to 23 Apr 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 one-way fares leaving within 3 days of 23 Apr 2027 to compare.
Every date we hold
4 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 6 Jan 2027 | $462 | Cathay Pacific | Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN) | 1 stop | found 5 days ago | Open this trip |
| 4 Apr 2027 | $513 | Alaska Airlines | Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN) | 2 stops | found 4 days ago | Open this trip |
| 23 Apr 2027 | $508 | Singapore Airlines | Seattle-Tacoma International Airport (SEA) → Incheon International Airport (ICN) | 2 stops | found yesterday | Open this trip |
Which month looks cheapest?
January 2027 is the cheapest month — from $462.
Airlines on the cheapest dates: Cathay Pacific, Alaska Airlines, Singapore Airlines.
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 18 Jan 2027 – 2 Feb 2027 in another cabin: Premium economy · Business · First
Today's prices for 23 Apr 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Seattle to Seoul?
Return
The cheapest fares were 7 to 13 days before departure.
From the cheapest return each day between 24 Sept and 12 Nov (42 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 |
|---|---|---|---|---|
| 7–13 days | $853 | $841 | Cheapest seen | 9 |
| 14–29 days | $917 | $853 | +8% | 9 |
| 30–59 days | $1,651 | $851 | +94% | 25 |
| 60–89 days | $1,853 | $840 | +117% | 8 |
| 90–179 days | $911 | $896 | +7% | 17 |
| 180+ days | $945 | $911 | +11% | 27 |
One-way
Fares 180 or more days before departure were typically 25% lower than 30 to 59 days before departure.
From the cheapest one-way each day between 24 Sept and 12 Nov (38 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 |
|---|---|---|---|---|
| 30–59 days | $579 | $462 | +33% | 10 |
| 60–89 days | $641 | $418 | +48% | 24 |
| 90–179 days | $508 | $433 | +17% | 17 |
| 180+ days | $434 | $431 | Cheapest seen | 18 |
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
$1,242
$402 more than flying from Seattle
23 Apr 2027 – 21 May 2027 · 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
Victoria → Seoul
119 km from Seattle
C$604 (US$424)
C$120 (US$84) less than flying from Seattle
2 Jun 2027 · YYJ → ICN · 2 stops
found yesterday
Everett → Seoul
34 km from Seattle
$661
$153 more than flying from Seattle
23 Apr 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 18 Jan 2027 – 2 Feb 2027. A live search on this page shows what those dates cost now, for one adult in economy.
Questions about this trip
How much is a return flight from Seattle to Seoul?
The cheapest return found recently is $840 with Cathay Pacific, 18 Jan 2027 to 2 Feb 2027, found yesterday. The cheapest return fare on each of 3 departure dates is usually $868 to $978.
How much is a one-way flight from Seattle to Seoul?
The cheapest one-way found recently is $508 with Singapore Airlines, 23 Apr 2027, found yesterday. The cheapest one-way we hold, of any age, is $462 with Cathay Pacific, 6 Jan 2027, found 5 days ago. The cheapest one-way fare on each of 3 departure dates is usually $485 to $511.
What is the cheapest month to fly from Seattle to Seoul?
January 2027 is the cheapest month for a return, from $840, 18 Jan 2027 to 2 Feb 2027, found yesterday. It is the cheapest month for a one-way too, from $462, 6 Jan 2027, found 5 days ago.
How far ahead should I book a flight from Seattle to Seoul?
In 42 days of prices between 24 Sept and 12 Nov, return fares were cheapest 7 to 13 days before departure. In 38 days of prices between 24 Sept and 12 Nov, one-way fares 180 or more days before departure were typically 25% lower than 30 to 59 days before departure.
Is there a direct flight from Seattle to Seoul?
Yes, the cheapest nonstop return found recently is $1,089 with Korean Air, 18 Jan 2027 to 2 Feb 2027, found yesterday.
How long is the flight from Seattle to Seoul?
The cheapest one-way found recently, with Singapore Airlines on 23 Apr 2027, takes 51 h 15 min with 2 stops.
Which airlines have the cheapest flights from Seattle to Seoul?
Between 5 Jan 2027 and 23 Apr 2027, Cathay Pacific has the cheapest return on 2 of the 3 departure dates we hold, and Alaska Airlines on 1. Between 6 Jan 2027 and 23 Apr 2027, Cathay Pacific has the cheapest one-way on 1 of the 3 departure dates we hold, Alaska Airlines on 1 and Singapore Airlines on 1.
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