Missoula (MSO) to Seattle (SEA) flights
Horizon Air, Alaska Airlines, SkyWest Airlines fly nonstop from Missoula Montana Airport to Seattle-Tacoma International Airport, with about 28 flights a week in July 2026. The 389-mile flight takes about 1h 37m gate to gate.
- Distance
- 389 mi · 626 km
- Flight time
- 1h 37m
- Airlines
- 3
- Seats filled
- 74%
Airlines flying MSO to SEA
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Horizon Air | 12 | Embraer E175 | 35,487 | 1h 34m |
| Alaska Airlines | 8 | Boeing 737-700 / MAX 7, Boeing 737-900ER, Boeing 737 MAX 9 | 56,017 | 1h 40m |
| SkyWest Airlines | 7 | Embraer E175 | 7,336 | 1h 39m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
MSO to SEA flight schedule
7 flight numbers flew this route in August 2026. The first usually leaves at 7:00am and the last at 7:59pm. 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 2153Alaska Airlines · operated by Horizon Air | 7:00am | 7:32am | 18 | 89% |
| AS 722Alaska Airlines | 7:15am | 7:58am | 13 | 100% |
| AS 3100Alaska Airlines · operated by SkyWest Airlines | 11:22am | 12:02pm | 18 | 70% |
| AS 2219Alaska Airlines · operated by Horizon Air | 2:05pm | 2:40pm | 13 | 83% |
| AS 660Alaska Airlines | 4:16pm | 5:00pm | 12 | 80% |
| AS 697Alaska Airlines | 5:00pm | 5:41pm | 18 | 73% |
| AS 2138Alaska Airlines · operated by Horizon Air | 7:59pm | 8:33pm | 12 | 34% |
Is MSO to SEA on time?
From September 2025 to August 2026, 81% of 1,168 flights arrived within 15 minutes of schedule and 1.2% were cancelled. Flights leaving around 7am were the most punctual (94%), those around 11am the least (70%). Most delay time was caused by late-arriving aircraft (48%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Alaska Airlines | 1,168 | 81% | 11 min | 1.2% |
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 |
|---|---|---|---|
| 6am to 7am | 191 | 86% | |
| 7am to 8am | 167 | 94% | |
| 11am to 12pm | 70 | 70% | |
| 1pm to 2pm | 136 | 89% | |
| 2pm to 3pm | 142 | 89% | |
| 3pm to 4pm | 37 | 84% | |
| 4pm to 5pm | 220 | 79% | |
| 5pm to 6pm | 70 | 70% | |
| 6pm to 7pm | 40 | 90% | |
| 7pm to 8pm | 56 | 34% | |
| 8pm to 9pm | 28 | 33% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 123 | 9,663 | |
| September 2025 | 98 | 7,574 | |
| October 2025 | 104 | 8,101 | |
| November 2025 | 87 | 7,577 | |
| December 2025 | 93 | 8,397 | |
| January 2026 | 90 | 7,811 | |
| February 2026 | 77 | 6,755 | |
| March 2026 | 81 | 7,684 | |
| April 2026 | 86 | 6,888 | |
| May 2026 | 103 | 8,616 | |
| June 2026 | 110 | 9,567 | |
| July 2026 | 122 | 10,207 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.