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SYD to HLN: distance & flight time
Sydney (Sydney Kingsford Smith International Airport) → Helena (Helena Regional Airport)
8,172 mi
13,151 km · 7,101 nm
16h 29m
estimated nonstop flight time
-16h
time difference · heading northeast
See live SYD→HLN fares Phone-only fares on this route — call free
Flight time details
8,172 miles nonstop takes roughly 16h 29m 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
- SYD — Sydney Kingsford Smith International Airport · Sydney, Australia
- HLN — Helena Regional Airport · Helena, 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 SYD
- BWU · Sydney Bankstown Airport11 mi away
- CDU · Camden Airport29 mi away
- XRH · RAAF Base Richmond33 mi away
- WOL · Wollongong Airport48 mi away
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
Frequently asked questions
How far is SYD from HLN?
The flight distance from Sydney (SYD) to Helena (HLN) is 8,172 miles (13,151 km, 7,101 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SYD to HLN?
A nonstop flight takes about 16h 29m 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 Sydney and Helena?
Helena is 16 hours behind Sydney.
What is the cheapest way to fly from SYD to HLN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SYD–HLN that never appear on search engines, with no booking fees.