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USN to SEA: distance & flight time
Ulsan (Ulsan Airport) → Seattle (Seattle Tacoma International Airport)
5,195 mi
8,360 km · 4,514 nm
10h 39m
estimated nonstop flight time
-16h
time difference · heading northeast
See live USN→SEA fares Phone-only fares on this route — call free
Flight time details
5,195 miles nonstop takes roughly 10h 39m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 16-hour time set-back when reading arrival times on your ticket.
The two airports
- USN — Ulsan Airport · Ulsan, South Korea
- SEA — Seattle Tacoma International Airport · Seattle, 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 USN
- KPO · Pohang Airport (G-815/K-3)28 mi away
- PUS · Gimhae International Airport37 mi away
- TAE · Daegu Airport44 mi away
- CHF · Jinhae Airbase/Airport (G-813/K-10)48 mi away
Near SEA
- RNT · Renton Municipal Airport5 mi away
- BFI · Boeing Field King County International Airport6 mi away
- TIW · Tacoma Narrows Airport18 mi away
- PWT · Bremerton National Airport21 mi away
Frequently asked questions
How far is USN from SEA?
The flight distance from Ulsan (USN) to Seattle (SEA) is 5,195 miles (8,360 km, 4,514 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from USN to SEA?
A nonstop flight takes about 10h 39m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the time difference between Ulsan and Seattle?
Seattle is 16 hours behind Ulsan.
What is the cheapest way to fly from USN to SEA?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on USN–SEA that never appear on search engines, with no booking fees.