Seattle (SEA) to Missoula (MSO) flights
Horizon Air, Alaska Airlines, SkyWest Airlines fly nonstop from Seattle-Tacoma International Airport to Missoula Montana Airport, with about 27 flights a week in July 2026. The 389-mile flight takes about 1h 24m gate to gate.
- Distance
- 389 mi · 626 km
- Flight time
- 1h 24m
- Airlines
- 3
- Seats filled
- 73%
Airlines flying SEA to MSO
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Horizon Air | 12 | Embraer E175 | 35,378 | 1h 23m |
| Alaska Airlines | 8 | Boeing 737-700 / MAX 7, Boeing 737-900ER, Boeing 737 MAX 9 | 56,153 | 1h 23m |
| SkyWest Airlines | 7 | Embraer E175 | 5,764 | 1h 34m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
SEA to MSO flight schedule
7 flight numbers flew this route in August 2026. The first usually leaves at 8:05am and the last at 8:30pm. 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 3101Alaska Airlines · operated by SkyWest Airlines | 8:05am | 10:42am | 18 | 89% |
| AS 2230Alaska Airlines · operated by Horizon Air | 9:55am | 12:23pm | 13 | 84% |
| AS 660Alaska Airlines | 12:45pm | 3:17pm | 12 | 88% |
| AS 697Alaska Airlines | 1:38pm | 4:09pm | 18 | 84% |
| AS 2123Alaska Airlines · operated by Horizon Air | 4:54pm | 7:19pm | 17 | 72% |
| AS 1435Alaska Airlines | 8:30pm | 10:59pm | 13 | 85% |
| AS 2154Alaska Airlines · operated by Horizon Air | 8:30pm | 10:55pm | 12 | 76% |
Is SEA to MSO on time?
From September 2025 to August 2026, 85% of 1,170 flights arrived within 15 minutes of schedule and 0.9% were cancelled. Flights leaving around 12pm were the most punctual (93%), those around 4pm the least (68%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (41%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Alaska Airlines | 1,170 | 85% | 9 min | 0.9% |
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 |
|---|---|---|---|
| 8am to 9am | 70 | 89% | |
| 9am to 10am | 246 | 87% | |
| 10am to 11am | 43 | 91% | |
| 12pm to 1pm | 128 | 93% | |
| 1pm to 2pm | 201 | 83% | |
| 3pm to 4pm | 50 | 94% | |
| 4pm to 5pm | 89 | 68% | |
| 8pm to 9pm | 53 | 79% | |
| 9pm to 10pm | 290 | 84% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 123 | 9,510 | |
| September 2025 | 98 | 7,611 | |
| October 2025 | 105 | 7,902 | |
| November 2025 | 88 | 7,261 | |
| December 2025 | 92 | 8,269 | |
| January 2026 | 90 | 7,117 | |
| February 2026 | 77 | 6,571 | |
| March 2026 | 83 | 7,437 | |
| April 2026 | 87 | 7,442 | |
| May 2026 | 102 | 8,389 | |
| June 2026 | 110 | 9,878 | |
| July 2026 | 121 | 9,908 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.