Route Reliability

Airport reliability

Missoula (MSO) on-time performance

How reliably flights leave Missoula, MT (MSO) and reach their destinations, by airline, departure hour and month, September 2025 to August 2026.

Historical performance Official DOT data through August 2026 · Not live flight status

Missoula, MT5,034 departures in 12 months

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Three-letter airport codes, nonstop U.S. domestic flights. One direction at a time.

Departures on time
82.2%
U.S. average 75.6%
Cancelled
0.7%
U.S. average 1.9%
60+ minutes late
5.6%
U.S. average 8.1%
Scheduled departures
5,034
12 months

What this means

MSO departures beat the U.S. average.

  • 82.2% of the 5,034 scheduled departures from Missoula (MSO) arrived at their destination on time, 6.6 points higher than the U.S. average of 75.6%.
  • 0.7% of departures were cancelled (U.S. average 1.9%), and 5.6% arrived an hour or more late.
  • Flights arriving at MSO were on time 80.8% of the time.
  • Among airlines with at least 300 departures, Delta Air Lines was the most punctual from MSO (90.5%) and Envoy Air the least (80.5%).
  • Over the last 3 years, September was the most reliable month for departures from MSO (85.5% on time) and January the least reliable (74.5%).
  • Cancellations peaked in January, when 3.0% of flights were cancelled.
  • Flights scheduled to depart before 6 am were the most punctual (92.4% on time); flights scheduled to depart 2 pm to 3 pm were the least (70.1%).

Airlines at MSO

Ranked by on-time arrival

Departures from MSO, September 2025 to August 2026. On time means arrived at the destination within 15 minutes of schedule.
AirlineOn timeCancelled 60+ min lateAvg delay when lateDepartures
Delta Air Lines 90.5%0.5% 2.8%97 min 958
United Airlines 81.8%0.6% 7.0%96 min 800
Alaska Airlines 81.7%1.1% 3.6%57 min 551
SkyWest AirlinesSold as United Express, Delta Connection, American Eagle, Alaska 81.0%0.9% 5.2%70 min 1,693
Envoy AirSold as American Eagle 80.5%0.3% 7.3%89 min 614
Allegiant Air 73.8%0.7% 9.3%98 min 279
American Airlines 67.2%0.8% 14.5%136 min 131
Frontier Airlines Insufficient sample 8

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On-time rate by departure hour

<6a 92.4%
6a 89.7%
7a 90.0%
8a 90.2%
9a Insufficient sample
10a 91.5%
11a 75.2%
12p 73.9%
1p 81.4%
2p 70.1%
3p 84.5%
4p 71.8%
5p 73.7%
6p 89.9%
7p Insufficient sample
8p Insufficient sample
9p Insufficient sample
10p Insufficient sample
Share of scheduled flights on time MSO average 82.2%
Departures from MSO by scheduled local departure hour, September 2025 to August 2026. Scale starts at zero.
Show as table
PeriodOn timeFlights
Departing before 6 am 92.4% 474
Departing 6 am to 7 am 89.7% 737
Departing 7 am to 8 am 90.0% 369
Departing 8 am to 9 am 90.2% 133
Departing 9 am to 10 am Insufficient sample 5
Departing 10 am to 11 am 91.5% 165
Departing 11 am to noon 75.2% 101
Departing noon to 1 pm 73.9% 218
Departing 1 pm to 2 pm 81.4% 779
Departing 2 pm to 3 pm 70.1% 469
Departing 3 pm to 4 pm 84.5% 207
Departing 4 pm to 5 pm 71.8% 411
Departing 5 pm to 6 pm 73.7% 525
Departing 6 pm to 7 pm 89.9% 346
Departing 7 pm to 8 pm Insufficient sample 29
Departing 8 pm to 9 pm Insufficient sample 33
Departing 9 pm to 10 pm Insufficient sample 19
Departing 10 pm to 11 pm Insufficient sample 14

Best and worst months at MSO

Jan 74.5%
Feb 81.8%
Mar 81.3%
Apr 84.5%
May 82.6%
Jun 79.5%
Jul 75.8%
Aug 76.4%
Sep 85.5%
Oct 84.3%
Nov 84.3%
Dec 79.7%
Share of scheduled flights on time 12-month average 82.2%
Departures from MSO by calendar month, September 2023 to August 2026 pooled. Scale starts at zero.
Show as table
PeriodOn timeFlights
January 74.5% 890
February 81.8% 774
March 81.3% 922
April 84.5% 923
May 82.6% 1,119
June 79.5% 1,586
July 75.8% 1,773
August 76.4% 1,606
September 85.5% 1,110
October 84.3% 964
November 84.3% 832
December 79.7% 912

Month by month, last 12 months

Sep 83.0%
Oct 84.0%
Nov 84.5%
Dec 78.9%
Jan 83.1%
Feb 87.5%
Mar 79.0%
Apr 86.1%
May 87.7%
Jun 80.9%
Jul 80.1%
Aug 76.5%
Share of scheduled flights on time U.S. average 75.6%
Departures from MSO, September 2025 to August 2026. Scale starts at zero.
Show as table
PeriodOn timeFlights
Sep 2025 83.0% 359
Oct 2025 84.0% 369
Nov 2025 84.5% 323
Dec 2025 78.9% 356
Jan 2026 83.1% 360
Feb 2026 87.5% 305
Mar 2026 79.0% 376
Apr 2026 86.1% 389
May 2026 87.7% 432
Jun 2026 80.9% 571
Jul 2026 80.1% 627
Aug 2026 76.5% 567

Busiest routes from MSO

Nonstop routes from MSO by scheduled flights, September 2025 to August 2026.
ToOn timeCancelledAirlinesFlights
Denver (DEN) 80.4%0.6%31,198
Salt Lake City (SLC) 90.2%0.9%21,059
Seattle (SEA) 81.1%0.9%2677
Minneapolis (MSP) 91.0%0.6%1491
Chicago (ORD) 74.0%0.8%3473
Dallas/Fort Worth (DFW) 80.9%0.7%2429
Los Angeles (LAX) 79.1%0.0%1191
Phoenix (AZA) 74.3%0.0%1140
San Francisco (SFO) 62.1%1.5%1132
Las Vegas (LAS) 77.0%1.8%1113
Portland (PDX) 82.9%0.0%1105
Airliner parked at a terminal gate
Photo: Depositphotos (licensed stock, illustrative only). Credits

Sources & data dates

Source
U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
Period
September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
Data through
August 2026
Processed
2026-11-03
Scope
Scheduled nonstop domestic departures from Missoula, MT (MSO) by airlines that report to the DOT.
Method
Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.

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