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HLN to CEI: distance & flight time
Helena (Helena Regional Airport) → Chiang Rai (Chiang Rai International Airport)
7,427 mi
11,952 km · 6,454 nm
15h 2m
estimated nonstop flight time
+13h
time difference · heading northwest
See live HLN→CEI fares Phone-only fares on this route — call free
Flight time details
7,427 miles nonstop takes roughly 15h 2m 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
- CEI — Chiang Rai International Airport · Chiang Rai, 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 CEI
- THL · Tachileik Airport37 mi away
- HOE · Ban Huoeisay Airport42 mi away
- MOG · Mong Hsat Airport56 mi away
- KET · Kengtung Airport95 mi away
Frequently asked questions
How far is HLN from CEI?
The flight distance from Helena (HLN) to Chiang Rai (CEI) is 7,427 miles (11,952 km, 6,454 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from HLN to CEI?
A nonstop flight takes about 15h 2m 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 Chiang Rai?
Chiang Rai is 13 hours ahead of Helena.
What is the cheapest way to fly from HLN to CEI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on HLN–CEI that never appear on search engines, with no booking fees.