Seattle-Tacoma International ⇄ Helena Regional SEA–HLN
Airlines flew 721 flights between Seattle-Tacoma International SEA in Seattle, WA and Helena Regional HLN in Helena, MT in the twelve months to July 2026, both directions together: 40,772 passengers in 54,796 seats, 74% of them filled, and 46,251 pounds of freight. 491 miles, about 70 minutes in the air, on 2 airlines: Horizon Air (701), SkyWest Airlines Inc. (20). Planning to fly it yourself? The weather and winds along this route right now.
Flights by month both directions
By month, as a table
| flights | |
|---|---|
| 1/25 | 60 |
| 2/25 | 56 |
| 3/25 | 62 |
| 4/25 | 60 |
| 5/25 | 62 |
| 6/25 | 60 |
| 7/25 | 62 |
| 8/25 | 62 |
| 9/25 | 60 |
| 10/25 | 62 |
| 11/25 | 58 |
| 12/25 | 61 |
| 1/26 | 62 |
| 2/26 | 56 |
| 3/26 | 58 |
| 4/26 | 60 |
| 5/26 | 60 |
| 6/26 | 60 |
| 7/26 | 62 |
Passengers by month
By month, as a table
| passengers | |
|---|---|
| 1/25 | 3,398 |
| 2/25 | 3,212 |
| 3/25 | 3,859 |
| 4/25 | 3,214 |
| 5/25 | 3,887 |
| 6/25 | 4,058 |
| 7/25 | 4,079 |
| 8/25 | 4,053 |
| 9/25 | 3,805 |
| 10/25 | 3,311 |
| 11/25 | 2,750 |
| 12/25 | 3,350 |
| 1/26 | 2,836 |
| 2/26 | 2,897 |
| 3/26 | 3,102 |
| 4/26 | 3,127 |
| 5/26 | 3,591 |
| 6/26 | 3,866 |
| 7/26 | 4,084 |
The airlines twelve months, both directions
| Airline | Flights | Passengers | Seats filled | Service |
|---|---|---|---|---|
| Horizon Air QX | 701 | 39,765 | 75% | scheduled passenger service |
| SkyWest Airlines Inc. OO | 20 | 1,007 | 66% | scheduled passenger service |
The aircraft as the airlines report their types
| Aircraft | Flights | Seats a flight | Passengers |
|---|---|---|---|
| Embraer ERJ-175 | 721 | 76 | 40,772 |
SEA → HLN this direction alone · flown January 2025 to July 2026
361 flights of 366 scheduled, 20,772 passengers in 27,436 seats, 40,700 pounds of freight. Horizon Air 351; SkyWest Airlines Inc. 10.
HLN → SEA this direction alone · flown January 2025 to July 2026
360 flights of 362 scheduled, 20,000 passengers in 27,360 seats, 5,551 pounds of freight. Horizon Air 350; SkyWest Airlines Inc. 10.
Source: the Bureau of Transportation Statistics' T-100 Segment table (all carriers). A flight is one departure performed on this segment; seats and passengers are the airlines' own monthly reports; "seats filled" is passengers divided by seats. The miles are the DOT's great-circle distance. Both ends: Seattle-Tacoma International SEA and Helena Regional HLN; all routes.