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HLN to ROI: distance & flight time
Helena (Helena Regional Airport) → Roi Et (Roi Et Airport)
7,566 mi
12,176 km · 6,575 nm
15h 18m
estimated nonstop flight time
+13h
time difference · heading northwest
See live HLN→ROI fares Phone-only fares on this route — call free
Flight time details
7,566 miles nonstop takes roughly 15h 18m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 13-hour time gain when reading arrival times on your ticket.
The two airports
- HLN — Helena Regional Airport · Helena, 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 HLN
- BTM · Bert Mooney Airport51 mi away
- GTF · Great Falls International Airport67 mi away
- BZN · Gallatin Field70 mi away
- LVM · Mission Field97 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 HLN from ROI?
The flight distance from Helena (HLN) to Roi Et (ROI) is 7,566 miles (12,176 km, 6,575 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from HLN to ROI?
A nonstop flight takes about 15h 18m 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 Helena and Roi Et?
Roi Et is 13 hours ahead of Helena.
What is the cheapest way to fly from HLN to ROI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on HLN–ROI that never appear on search engines, with no booking fees.