Route
MSO → SEA
Missoula Montana Airport Seattle–Tacoma International Airport
How punctual is this route?
- On-time arrivals
- 81.8%
- Less than 15 minutes late
- Cancelled
- 0.9%
- Of scheduled flights
- Average delay when late
- 60 min
- Flights arriving 15+ minutes late
- Flights tracked
- 677
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 51%
- Airline (crew, maintenance, cleaning) 25%
- Air traffic control & airport 22%
- Extreme weather 3%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 72.0% | 25 |
| October 2025 | 88.9% | 36 |
| November 2025 | 80.7% | 59 |
| December 2025 | 73.8% | 61 |
| January 2026 | 86.7% | 62 |
| February 2026 | 89.7% | 39 |
| March 2026 | 80.4% | 57 |
| April 2026 | 90.9% | 78 |
| May 2026 | 90.7% | 54 |
| June 2026 | 84.4% | 77 |
| July 2026 | 80.6% | 67 |
| August 2026 | 61.3% | 62 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Alaska Airlines | 551 | 82.6% | 1.1% | 65 min |
| SkyWest Airlines | 126 | 78.6% | 0.0% | 45 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
AS660
20% late · 156 flights
-
AS697
27% late · 120 flights
-
AS138
14% late · 70 flights
-
OO3100
30% late · 70 flights
-
AS1481
6% late · 47 flights
-
OO3063
17% late · 35 flights
-
AS665
6% late · 34 flights
-
AS518
17% late · 30 flights
-
AS377
12% late · 26 flights
-
AS561
8% late · 25 flights
-
OO3320
0% late · 21 flights
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