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ICN to ALN: distance & flight time
Seoul (Incheon International Airport) → Alton/St Louis (St Louis Regional Airport)
6,673 mi
10,740 km · 5,799 nm
13h 33m
estimated nonstop flight time
—
time difference · heading northeast
See live ICN→ALN fares Phone-only fares on this route — call free
Flight time details
6,673 miles nonstop takes roughly 13h 33m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Both airports share the same local time, so schedules read exactly as flown.
The two airports
- ICN — Incheon International Airport · Seoul, South Korea
- ALN — St Louis Regional Airport · Alton/St Louis, United States
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near ICN
- GMP · Gimpo International Airport20 mi away
- SWU · Suwon Airport34 mi away
- SSN · Seoul Air Base (K-16)36 mi away
- OSN · Osan Air Base41 mi away
Near ALN
- STL · St Louis Lambert International Airport20 mi away
- BLV · Scott AFB/Midamerica Airport26 mi away
- SUS · Spirit of St Louis Airport36 mi away
- SPI · Abraham Lincoln Capital Airport69 mi away
Frequently asked questions
How far is ICN from ALN?
The flight distance from Seoul (ICN) to Alton/St Louis (ALN) is 6,673 miles (10,740 km, 5,799 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ICN to ALN?
A nonstop flight takes about 13h 33m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
Are there nonstop flights from ICN to ALN?
Nonstop service on ICN–ALN depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 13h 33m nonstop estimate.
What is the cheapest way to fly from ICN to ALN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ICN–ALN that never appear on search engines, with no booking fees.
Why are some ICN to ALN fares phone-only?
Consolidator contracts let us sell certain ICN–ALN tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.