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ROI to USN: distance & flight time
Roi Et (Roi Et Airport) → Ulsan (Ulsan Airport)
2,071 mi
3,333 km · 1,800 nm
4h 32m
estimated nonstop flight time
+2h
time difference · heading northeast
See live ROI→USN fares Phone-only fares on this route — call free
Flight time details
2,071 miles nonstop takes roughly 4h 32m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 2-hour time gain when reading arrival times on your ticket.
The two airports
- ROI — Roi Et Airport · Roi Et, Thailand
- USN — Ulsan Airport · Ulsan, South Korea
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 ROI
- KKC · Khon Kaen Airport70 mi away
- BFV · Buri Ram Airport70 mi away
- ZVK · Savannakhet Airport72 mi away
- SNO · Sakon Nakhon Airport78 mi away
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
Frequently asked questions
How far is ROI from USN?
The flight distance from Roi Et (ROI) to Ulsan (USN) is 2,071 miles (3,333 km, 1,800 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ROI to USN?
A nonstop flight takes about 4h 32m 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 Roi Et and Ulsan?
Ulsan is 2 hours ahead of Roi Et.
What is the cheapest way to fly from ROI to USN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ROI–USN that never appear on search engines, with no booking fees.