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HLN to SDY: distance & flight time
Helena (Helena Regional Airport) → Sidney (Sidney - Richland Regional Airport)
374 mi
601 km · 325 nm
1h 27m
estimated nonstop flight time
Same time
time difference · heading east
See live HLN→SDY fares Phone-only fares on this route — call free
Flight time details
374 miles nonstop takes roughly 1h 27m gate to gate, flying east. Add 45–90 minutes per connection if there's no nonstop service. Both airports share the same local time, so schedules read exactly as flown.
The two airports
- HLN — Helena Regional Airport · Helena, United States
- SDY — Sidney - Richland Regional Airport · Sidney, 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 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 SDY
- ISN · Sloulin Field International Airport41 mi away
- GDV · Dawson Community Airport49 mi away
- OLF · L M Clayton Airport69 mi away
- DIK · Dickinson Theodore Roosevelt Regional Airport91 mi away
Frequently asked questions
How far is HLN from SDY?
The flight distance from Helena (HLN) to Sidney (SDY) is 374 miles (601 km, 325 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from HLN to SDY?
A nonstop flight takes about 1h 27m 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 cheapest way to fly from HLN to SDY?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on HLN–SDY that never appear on search engines, with no booking fees.