Missoula Montana in September 2023

88.5%departed on time

BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.

In September 2023, reporting carriers scheduled 375 domestic departures from Missoula Montana (MSO). 88.5% left less than 15 minutes late and 87.2% reached their destination on time; 0.0% were cancelled.

Nationally that month, 80.5% of flights departed on time and 80.1% arrived on time, so MSO departures were 8.0 points above the national departure figure.

Flights arriving at MSO that month were on time 86.7% of the time (375 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 53%, air carrier 29% and national aviation system 15%.

On time 87.2%
Arrived 15+ minutes late 12.5%
Cancelled 0.0%
Diverted 0.3%

Every scheduled departure from MSO in September 2023, judged by arrival at the destination.

September 2023 against a year earlier, the airport's year and the nation

Measure	Sep 2023	Year earlier	MSO, 12 months to Jul 2026	All reported flights, Sep 2023
Departed on time	88.5%	—	83.4%	80.5%
Arrived on time	87.2%	—	82.1%	80.1%
Cancelled	0.0%	—	0.7%	1.2%
Average departure delay (late minutes only)	11.0 min	—	14.8 min	14.1 min
Scheduled departures a day	13	—	14	18,978
Scheduled departures	375	—	5,003	569,338

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	196	52%	90.3%	-2.3 min	0.0%
UA United Airlines	64	17%	82.8%	1.4 min	0.0%
DL Delta Air Lines	62	17%	87.1%	-2.4 min	0.0%
AA American Airlines	30	8%	80.0%	42.3 min	0.0%
G4 Allegiant Air	18	5%	77.8%	37.5 min	0.0%
MQ Envoy Air	5	1%	100.0%	-6.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MSO–DEN	Missoula to Denver	113	82.3%	1.9 min	0.0%
MSO–SLC	Missoula to Salt Lake City	88	95.5%	-6.4 min	0.0%
MSO–MSP	Missoula to Minneapolis	58	87.9%	-3.3 min	0.0%
MSO–DFW	Missoula to Dallas/Fort Worth	30	80.0%	42.3 min	0.0%
MSO–LAX	Missoula to Los Angeles	30	100.0%	-5.6 min	0.0%
MSO–SEA	Missoula to Seattle	25	72.0%	11.6 min	0.0%
MSO–AZA	Missoula to Phoenix	9	88.9%	53.3 min	0.0%
MSO–LAS	Missoula to Las Vegas	9	66.7%	21.7 min	0.0%
MSO–ORD	Missoula to Chicago	9	100.0%	-12.6 min	0.0%
MSO–SFO	Missoula to San Francisco	4	100.0%	-2.5 min	0.0%

By scheduled departure hour

100

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), September 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2023	Minutes
Air carrier	29.0%	36.4%	1,185
Late-arriving aircraft	52.6%	38.3%	2,152
National Aviation System	14.7%	19.9%	603
Extreme weather	3.7%	5.1%	152
Security	0.0%	0.2%	0

4,092 delay minutes on 47 flights that arrived 15 or more minutes late and carried a cause report. Carriers assign the categories; see what each category means.

Questions and answers

How many flights left MSO on time in September 2023?

88.5% of 375 scheduled domestic departures left less than 15 minutes late, and 87.2% reached their destination on time. The national figures that month were 80.5% and 80.1%.

How does that compare with a year earlier?

September 2022 is outside the 36 months on file, or the airport had too few reported flights that month.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2023; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for MSO · methodology · corrections.