Missoula Montana (MSO) Delays and On-Time Departures
Missoula, MT · ranked 71st of 333 airports for on-time departures
Data through July 2026 · Last updated October 18, 2026
84.0% of the 5,003 flights scheduled to depart Missoula (MSO) in the last 12 months left on time, 6.6 points above the US average of 77.4%.
That ranks 71st of 333 US airports tracked on this site, with 0.7% of departures cancelled.
Among airlines at Missoula (MSO), Delta Air Lines left on time most often (89.6%).
Over 24 months, Tuesday was the most reliable day (86% on time) and August the worst month (79%).
Best time of day to fly out of Missoula (MSO)
On-time departure % by scheduled departure hour (local time), last 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 92.1% | 0.1% | 1,111 |
| 6am–7am | 92.8% | 0.2% | 1,091 |
| 7am–8am | 94.5% | 1.1% | 520 |
| 8am–9am | 91.8% | 1.5% | 198 |
| 9am–10am | Limited data | 2 | |
| 10am–11am | 90.3% | 1.3% | 231 |
| 11am–12pm | 93.7% | 0.3% | 286 |
| 12pm–1pm | 83.5% | 0.6% | 646 |
| 1pm–2pm | 78.4% | 1.0% | 1,312 |
| 2pm–3pm | 71.6% | 0.7% | 1,148 |
| 3pm–4pm | 82.1% | 0.0% | 397 |
| 4pm–5pm | 74.3% | 0.9% | 676 |
| 5pm–6pm | 74.4% | 0.9% | 867 |
| 6pm–7pm | 88.4% | 0.4% | 686 |
| 7pm–8pm | 93.5% | 3.1% | 32 |
| 8pm–9pm | 70.7% | 0.0% | 41 |
| 9pm–10pm | 69.6% | 0.0% | 46 |
| 10pm–11pm | 71.4% | 2.0% | 50 |
Airlines at MSO ranked by on-time departures
Last 12 months. Airlines with fewer than 30 departures are marked “limited data”.
| Airline | On-time departures | On-time arrivals | Cancelled | Departures |
|---|---|---|---|---|
| Delta Air Lines | 89.6% | 90.6% | 0.4% | 956 |
| Alaska Airlines | 86.5% | 81.8% | 1.1% | 538 |
| SkyWest Airlines | 84.2% | 82.6% | 0.9% | 1,612 |
| United Airlines | 83.6% | 83.4% | 0.6% | 821 |
| Envoy Air | 80.9% | 80.7% | 0.3% | 637 |
| Allegiant Air | 77.7% | 73.0% | 0.7% | 284 |
| American Airlines | 63.8% | 68.9% | 2.1% | 141 |
| Frontier Airlines | Limited data | 14 | ||
80%+ good 70–79.9% fair <70% poor
Best day to fly out of MSO
On-time departures by day, 24 months.
Best month to fly out of MSO
On-time departures by month, 24 months.
Holiday travel at Missoula (MSO)
On-time departures during holiday periods compared with all other days, last 24 months.
| Period | On-time departures | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 85.2% | +0.6 pts | 0.0% | 142 |
| Christmas & New Year (Dec 20 - Jan 3) | 79.6% | -5.0 pts | 1.5% | 329 |
| Summer peak (Jun 15 - Aug 15) | 80.2% | -4.5 pts | 0.5% | 2,350 |
| All other days | 84.7% | — | 0.7% | 6,519 |
Monthly on-time departure trend at MSO
On-time departure % each month, with the 12-month US average for reference.
Routes from Missoula (MSO)
Every route from MSO with its own page, by number of flights (last 12 months, on-time arrivals).
| To | On time | Cancelled | Flights |
|---|---|---|---|
| MSO → Denver (DEN) | 81.1% | 0.5% | 1,204 |
| MSO → Salt Lake City (SLC) | 91.4% | 0.9% | 1,059 |
| MSO → Seattle (SEA) | 82.3% | 0.9% | 646 |
| MSO → Chicago (ORD) | 75.0% | 0.8% | 500 |
| MSO → Minneapolis (MSP) | 91.0% | 0.4% | 489 |
| MSO → Dallas/Fort Worth (DFW) | 82.3% | 1.1% | 435 |
| MSO → Los Angeles (LAX) | 78.2% | 0.0% | 165 |