Seattle (SEA) to Helena (HLN) flights
Horizon Air flies nonstop from Seattle-Tacoma International Airport to Helena Regional Airport, with about 7 flights a week in July 2026. The 491-mile flight takes about 1h 29m gate to gate.
- Distance
- 491 mi · 790 km
- Flight time
- 1h 29m
- Airlines
- 1
- Seats filled
- 76%
Airlines flying SEA to HLN
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Horizon Air | 7 | Embraer E175 | 20,264 | 1h 29m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
SEA to HLN flight schedule
2 flight numbers flew this route in August 2026. The first usually leaves at 1:57pm and the last at 1:58pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| AS 2131Alaska Airlines · operated by Horizon Air | 1:57pm | 4:32pm | 18 | 59% |
| AS 2222Alaska Airlines · operated by Horizon Air | 1:58pm | 4:34pm | 13 | 90% |
Is SEA to HLN on time?
From September 2025 to August 2026, 81% of 364 flights arrived within 15 minutes of schedule and 0.5% were cancelled. Flights leaving around 3pm were the most punctual (92%), those around 1pm the least (68%). Most delay time was caused by late-arriving aircraft (51%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Alaska Airlines | 364 | 81% | 11 min | 0.5% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 12pm to 1pm | 33 | 82% | |
| 1pm to 2pm | 141 | 68% | |
| 3pm to 4pm | 176 | 92% | |
| 4pm to 5pm | 10 | 60% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 31 | 2,077 | |
| September 2025 | 30 | 1,889 | |
| October 2025 | 31 | 1,662 | |
| November 2025 | 29 | 1,410 | |
| December 2025 | 31 | 1,769 | |
| January 2026 | 31 | 1,451 | |
| February 2026 | 28 | 1,488 | |
| March 2026 | 29 | 1,542 | |
| April 2026 | 30 | 1,635 | |
| May 2026 | 30 | 1,813 | |
| June 2026 | 30 | 1,987 | |
| July 2026 | 31 | 2,049 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.