Need help booking?
Unpublished phone-only deals available
ISN to ROI: distance & flight time
Williston (Sloulin Field International Airport) → Roi Et (Roi Et Airport)
7,684 mi
12,366 km · 6,677 nm
15h 32m
estimated nonstop flight time
+12h
time difference · heading northwest
See live ISN→ROI fares Phone-only fares on this route — call free
Flight time details
7,684 miles nonstop takes roughly 15h 32m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 12-hour time gain when reading arrival times on your ticket.
The two airports
- ISN — Sloulin Field International Airport · Williston, United States
- ROI — Roi Et Airport · Roi Et, Thailand
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 ISN
- SDY · Sidney - Richland Regional Airport41 mi away
- YEN · Estevan Airport78 mi away
- OLF · L M Clayton Airport89 mi away
- GDV · Dawson Community Airport90 mi away
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
Frequently asked questions
How far is ISN from ROI?
The flight distance from Williston (ISN) to Roi Et (ROI) is 7,684 miles (12,366 km, 6,677 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ISN to ROI?
A nonstop flight takes about 15h 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 Williston and Roi Et?
Roi Et is 12 hours ahead of Williston.
What is the cheapest way to fly from ISN to ROI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ISN–ROI that never appear on search engines, with no booking fees.