Missoula (MSO) to Salt Lake City (SLC): On-Time Performance
Data through May 2026
Missoula (MSO) to Salt Lake City (SLC) effectively runs on two schedules. In September 2025, 99% of arrivals were on time; in February 2025 that fell to 78% — a 20-point seasonal swing. Across the full period the route averages 89% on-time against a national 78%.
- On-time
- 89%
- arrived <15 min late
- Avg delay
- 11 min
- completed flights
- Cancelled
- 0.7%
- Flights/day
- 2.9
- last 12 months
- Duration
- 1h 38m
- scheduled
- Distance
- 436 mi
Best airline from MSO to SLC
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 90% | 8 min | 0.8% | 1,332 |
| Delta Air Lines | 88% | 16 min | 0.5% | 799 |
Monthly on-time trend
Best time to fly from MSO to SLC
Aim for departures around 11 a.m. (93% on-time); avoid 5 p.m. departures (86%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Mondaybest | 94% | 5 min |
| Tuesday | 90% | 13 min |
| Wednesday | 89% | 8 min |
| Thursday | 88% | 13 min |
| Friday | 87% | 13 min |
| Saturday | 86% | 15 min |
| Sunday | 90% | 8 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft8%
- Airline operations65%
- National airspace system7%
- Weather20%
Frequently asked questions
- How often are flights from MSO to SLC delayed?
- 11% of MSO–SLC flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 11 minutes.
- Which airline is most reliable from MSO to SLC?
- SkyWest Airlines has the best on-time record on this route at 90%, based on 1,332 flights. 2 airlines flew MSO–SLC frequently enough to compare in this period.
- What is the best time of day to fly from MSO to SLC?
- Departures around 11 a.m. have the best record (93% on-time), while departures around 5 p.m. have the worst (86%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from MSO to SLC?
- The scheduled MSO–SLC flight time averages 1h 38m over 436 miles. Actual arrival times vary — flights on this route land 15+ minutes late 11% of the time.
- How often are MSO to SLC flights cancelled?
- 0.7% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from MSO to SLC?
- February 2025 was the roughest month in this dataset, with only 78% of arrivals on time. The best was September 2025 at 99%. If your dates are flexible, that 20-point gap is worth planning around.
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Based on 2,131 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.