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Flights between Helena (HLN) and Seattle (SEA)

Helena Regional Airport, United States ↔ Seattle–Tacoma International Airport, United States

A direct route between Helena and Seattle appears in the OpenFlights route network.

Airlines currently operating this route:

Observed from recent schedules · as of 26 Jul 2026 — sampled, not a live timetable; confirm with the airline.

Alaska Airlines (AS)
Distance
788 km
490 miles
Est. flight time
1h 29m
great-circle estimate
Time difference
~1h
varies with DST
View this route on the live map →Search fares on Skyscanner ↗

Climate

Typical monthly temperatures in United States

Jan
4°
9/-1
70mm
Feb
6°
11/1
60mm
Mar
11°
16/6
75mm
Apr
17°
22/12
80mm
May
23°
28/18
95mm
Jun
28°
33/23
100mm
Jul
30°
35/25
95mm
Aug
29°
34/24
90mm
Sep
25°
30/20
80mm
Oct
18°
23/13
70mm
Nov
11°
16/6
70mm
Dec
5°
10/0
75mm

Mean °C (high/low below), avg. rainfall mm · country-level monthly normals, not airport-specific.

Typical monthly temperatures in United States

Jan
4°
9/-1
70mm
Feb
6°
11/1
60mm
Mar
11°
16/6
75mm
Apr
17°
22/12
80mm
May
23°
28/18
95mm
Jun
28°
33/23
100mm
Jul
30°
35/25
95mm
Aug
29°
34/24
90mm
Sep
25°
30/20
80mm
Oct
18°
23/13
70mm
Nov
11°
16/6
70mm
Dec
5°
10/0
75mm

Mean °C (high/low below), avg. rainfall mm · country-level monthly normals, not airport-specific.

Common questions

How far is Helena from Seattle?

Helena (HLN) and Seattle (SEA) are around 788 km (490 miles) apart — an estimated 1h 29m by air. Distances and flight times are great-circle estimates.

Which airlines have operated the HLN–SEA route?

Airlines recorded operating this route in the OpenFlights network include Alaska Airlines. This reflects historical scheduled service and may be out of date.

What is the time difference between Helena and Seattle?

Time difference ~ 1 hour (varies with daylight-saving).

When is it warmest in United States?

Across United States, the warmest month on average is July, with mean temperatures around 30°C. These are country-level monthly climate normals, not airport-specific.

Distances and flight times are great-circle estimates, not booked block times.