The sector is held by Air Incheon, Alaska Airlines, Asiana Airlines, Delta Air Lines and Korean Air.
Airport pair · hand carry reference
SEA Seattle to ICN Seoul
Seattle Tacoma International, the United States, to Incheon International, South Korea. Computed from the scheduled network held on 2026-09-07.
- Nonstop
- 4.9 times a day
- Great circle
- 8,373 km
- Block, estimated
- 10h 35m
- Door to door
- 17h 20m
What SEA to ICN looks like
The SEA to ICN sector, the carriers on it and the flying time, before anything is promised to anybody.
Seattle SEA to Seoul ICN is an ultra long sector of 8,373 km by great circle, flown nonstop 4.9 times a day.
At the cruise speed this site models for 8,373 km, 880 km an hour, and thirty minutes of taxi at the two ends, the flight blocks at about 10h 35m.
Seattle SEA is a large airport in the network held here, 145 scheduled destinations and 717.9 departures a day. Seoul ICN has 165 destinations and 641.2 departures a day.
Seoul runs 17 hours ahead of Seattle in January and 16 hours ahead in July, because the two ends do not change their clocks together.
The pair sits between the Americas and Asia Pacific, a corridor where the site already publishes 16 written lanes that go into customs and ground detail this page does not.
Who flies the sector, and how often
Average daily frequencies on SEA to ICN from the scheduled route statistics, both directions, with the operating carriers named.
| Direction | Flights a day | Flights a week | Operated by |
|---|---|---|---|
| SEA to ICN | 4.86 | 34 | Air Incheon, Alaska Airlines, Asiana Airlines, Delta Air Lines, Korean Air |
| ICN to SEA | 4.14 | 29 | Alaska Airlines, Asiana Airlines, Delta Air Lines, Korean Air |
5 carriers are recorded on the sector, so a missed departure is normally a rebooking rather than a lost day.
At 4.9 times a day there is usually another departure within a few hours, which is what makes a same day booking on this pair realistic.
Between them the two directions put about 63 departures a week on SEA to ICN, which is the number that decides whether a seat can be found today or on Thursday.
The clock from collection to signature
The same ground timings the route calculator starts from, applied to the 10h 35m block time on SEA to ICN. Change any of them in the tool further down and the total moves with them.
| Stage | Allowed | Elapsed |
|---|---|---|
| Collection and the run to SEA | 90 min | 1h 30m |
| At SEA before departure | 180 min | 4h 30m |
| SEA to ICN in the air, estimated | 635 min | 15h 05m |
| Formalities at ICN | 90 min | 16h 35m |
| Delivery run in Seoul | 45 min | 17h 20m |
| Door to door | 1,040 min | 17h 20m |
On the desk standard ground timings, ninety minutes to collect and reach the airport, three hours at the airport before departure, ninety minutes of arrival formalities and a forty five minute delivery run, the door to door figure for SEA to ICN is 17h 20m.
A courier who leaves Seattle at 09:00 local is on the ground in Seoul at about 12:35 local and at the door by 14:50 the following day.
Working backwards from a six in the evening handover in Seoul, nothing leaving Seattle inside a normal working day arrives in time, so this pair is an overnight and a next morning delivery rather than a same day one.
At 17h 20m the mission is past the sixteen hour duty day a single courier is planned against, so it is quoted with a rest at the far end or with a second courier, and never as a turnaround.
When the nonstop does not work
Every airport that joins the two ends, ranked by when they land, among the ones whose weaker leg is dependable enough to plan on. Connection time is allowed for the size of the hub. 40 of them join SEA to ICN.
| Connecting at | SEA to hub, flights a day | Hub to ICN, flights a day | Track, km | Estimated, gate to gate |
|---|---|---|---|---|
| Anchorage ANC | 25.57 | 1.71 | 8,423 | 12h 19m |
| Vancouver YVR | 19.71 | 4 | 8,405 | 12h 26m |
| Tokyo NRT | 2.29 | 49 | 8,913 | 13h 04m |
| Tokyo HND | 2.29 | 3.43 | 8,921 | 13h 05m |
| Calgary YYC | 6.57 | 1 | 9,268 | 13h 36m |
| San Francisco SFO | 22.71 | 7.71 | 10,178 | 14h 36m |
With 4.9 times a day on the nonstop, a connection here is a disruption plan rather than a routing, and it is listed because a closed runway or a cancellation wave is exactly when nobody has time to work it out.
40 airports connect the two ends on the scheduled network held here. The quickest of the dependable ones is Anchorage ANC, where the weaker of the two legs still runs about once a day.
Through ANC the routing covers 8,423 km against the 8,373 km nonstop track and takes about 12h 19m in the air and on the ground at the hub, allowing 60 minutes to connect at an airport of that size.
That is only 1h 44m more than the nonstop, which is close enough that a connection is worth taking when the nonstop is full or badly timed.
Behind it, Vancouver YVR at 12h 26m and Tokyo NRT at 13h 04m hold the same connection, so a booking has three hubs to try before it has to wait for the nonstop.
If nothing suitable leaves Seattle, Victoria YYJ is 157 km away by great circle and carries 22 scheduled destinations of its own, which is usually a shorter road transfer than a lost day.
Restricted hours at either end
Widely documented operating restrictions, checked 2026-09-07. Exemptions and seasonal variations exist, so confirm with the carrier before relying on any of them.
Seoul ICN, night operations: Operates around the clock.
Industry within reach of the two ends
Public manufacturing and research sites whose logistics run through SEA or ICN. Listed as industrial geography, not as customers of anyone.
- Boeing, Everett and RentonWidebody and 737 final assembly. A European supplier base and an American line, eight time zones apart. Logistics through Seattle SEA.
- Hyundai and Kia, Ulsan and HwaseongThe largest car plant complex in the world by capacity at Ulsan. Korean lines with European and American tooling. Logistics through Seoul ICN.
- Samsung, Hwaseong and GiheungMemory and logic fabrication. An hour south of Incheon, and the destination for a great deal of European equipment. Logistics through Seoul ICN.
Plan Seattle to Seoul yourself
The same tool the dispatchers use, open to anybody and free. It is loaded with this pair already. Change either end, add a stopover or a preferred airline, and it works out the connection, the transit and the door to door clock, with the real departures underneath. Put it on your own site if it is useful to you.
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Restrictions
Where this came from, and where to look next
- Carriers and frequencies: AeroDataBox scheduled route statistics, retrieved 2026-09-07. Average daily flights, not a timetable.
- Distances: great circle from published coordinates. They read short against a flown track, which is why the block time above applies a factor to them.
- Block and connection times: the same model the route calculator lower down this page runs, at the same rounding.
- Restrictions: the airport notes file, checked 2026-09-07.
- Industrial sites: public company information. Nothing here says or implies that any company named is a customer of any courier operator.
Who publishes this. OnBoard Courier is a placement desk in Dubai. An assignment is carried out by a vetted partner operator, with the desk as the single point of contact from the quote to the signature. This page exists because our own dispatchers need the answer for SEA to ICN in the twenty minutes before a promise is made, and a reference only one operator can read is not a reference. Free to read, quote and cite. Found an error? Tell us and we will correct it.
If you need something moved rather than looked up, the desk prices a hand carry in fifteen minutes.
- The SEA airport entry
- The ICN airport entry
- Hand carry into the United States
- Hand carry into South Korea
- The written lane, Dubai to Seattle
- The written lane, Seattle to Nagoya
- The written lane, Abu Dhabi to Seoul
- The route calculator
More pairs through SEA and ICN: Seoul to Taipei, Seoul to Singapore, Paris to Seoul, London to Seoul, Osaka to Seoul, Seoul to Atlanta, Seoul to Hong Kong, Nagoya to Seoul.