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HLN to SEA: distance & flight time
Helena (Helena Regional Airport) → Seattle (Seattle Tacoma International Airport)
489 mi
788 km · 425 nm
1h 32m
estimated nonstop flight time
-1h
time difference · heading west
See live HLN→SEA fares Phone-only fares on this route — call free
Flight time details
489 miles nonstop takes roughly 1h 32m gate to gate, flying west. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 1-hour time set-back when reading arrival times on your ticket.
The two airports
- HLN — Helena Regional Airport · Helena, United States
- SEA — Seattle Tacoma International Airport · Seattle, 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 SEA
- RNT · Renton Municipal Airport5 mi away
- BFI · Boeing Field King County International Airport6 mi away
- TIW · Tacoma Narrows Airport18 mi away
- PWT · Bremerton National Airport21 mi away
Frequently asked questions
How far is HLN from SEA?
The flight distance from Helena (HLN) to Seattle (SEA) is 489 miles (788 km, 425 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from HLN to SEA?
A nonstop flight takes about 1h 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 Helena and Seattle?
Seattle is 1 hour behind Helena.
What is the cheapest way to fly from HLN to SEA?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on HLN–SEA that never appear on search engines, with no booking fees.