South Korea has quietly become one of the best long-haul values from the US. Nonstop competition into Seoul keeps base fares lower than most of Asia, and the won stretches a long way once you land. Here is what the flight actually costs and how to book it for less.
How much are flights to South Korea from the US?
Expect $600 to $800 round trip in economy from most major US airports, with the West Coast at the low end. One-way fares from Los Angeles, San Francisco or Seattle regularly dip into the low $300s in the quiet months, and true sale fares can put a round trip near $500. From the East Coast and Midwest you will usually pay $100 to $250 more for the added distance, though a one-stop routing can close that gap.
| Season | Months | Typical round-trip fare |
|---|---|---|
| Low season | September, October, January | $550 to $700 |
| Shoulder | November, February, May | $650 to $800 |
| Peak | June to August, early April | $850 to $1,200+ |
When is the cheapest time to fly to Seoul?
The best prices land in late fall and deep winter. September and October drop right after the summer peak, and January is the single cheapest month on average once the holiday rush clears. Steer clear of two windows that spike hard: the summer school break from June through August, and the cherry-blossom weeks in late March and early April, when both demand and prices jump. If your dates are flexible, shifting a trip by even two or three weeks can save a couple hundred dollars. See our full breakdown of how far ahead to book international flights to time it right.
Which airports and airlines are cheapest?
Incheon International (ICN) is Seoul's main gateway and the cheapest way in, handling nearly all long-haul traffic. Gimpo (GMP) is closer to the city but mostly serves domestic and short regional routes, so it rarely matters for a US traveler. On the airline side, newer long-haul carriers such as Air Premia have added low-cost competition on the transpacific route, and legacy carriers like Korean Air, Asiana and United round out the nonstops. The more carriers on your route, the lower the floor, which is why West Coast departures win.
How do you find the cheapest Seoul fare?
A few habits do most of the work:
- Book 2 to 4 months out. That is the sweet spot for transpacific economy; last-minute buyers pay a clear premium.
- Set a price alert on your route and let the dip come to you rather than checking daily.
- Search nearby departure airports. If you are near the East Coast, price a positioning flight to the West Coast against the direct fare.
- Compare one-stop routings. A connection through Tokyo, Taipei or another Asian hub is often cheaper than the nonstop, and layovers usually cut 20 to 50% off.
Find your cheapest fare to Seoul
FareFinderAI compares nonstop and one-stop routings to Incheon across every major search engine in one free search, so you see the low fare the big sites bury.
Search Seoul Flights Free →Should you fly to Seoul via another Asian hub?
Often, yes. Seoul sits next door to Tokyo, and the two make a natural pair. A one-stop itinerary through Tokyo or another hub can undercut the nonstop, and it opens the door to a cheap add-on trip if you want to see both countries. If you are already weighing cheap flights to Japan or a wider Southeast Asia loop, an open routing through Seoul can be the most efficient way to string them together. Just keep separate tickets safe with a long layover, the same rule that makes advanced routing tricks work.
Frequently asked questions
South Korea rewards flexible travelers. Fly into Incheon in the off-peak months, book a few months ahead, and let a price alert catch the dip, and Seoul is one of the cheapest long-haul trips you can take from the US.