Missoula Montana in September 2025

86.6%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 2025, reporting carriers scheduled 359 domestic departures from Missoula Montana (MSO). 86.6% left less than 15 minutes late and 83.0% reached their destination on time; 0.3% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so MSO departures were 3.5 points above the national departure figure.

A year earlier, in September 2024, the airport had 376 departures with 85.9% leaving on time: a change of +0.7 points, with flights down 5%.

Flights arriving at MSO that month were on time 88.9% of the time (359 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, national aviation system 66%, air carrier 14% and late-arriving aircraft 14%.

On time 83.0%
Arrived 15+ minutes late 16.4%
Cancelled 0.3%
Diverted 0.3%

Every scheduled departure from MSO in September 2025, judged by arrival at the destination.

September 2025 against a year earlier, the airport's year and the nation

Measure	Sep 2025	Sep 2024	MSO, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	86.6%	85.9%	83.4%	83.1%
Arrived on time	83.0%	86.2%	82.1%	82.8%
Cancelled	0.3%	0.0%	0.7%	0.5%
Average departure delay (late minutes only)	13.0 min	9.6 min	14.8 min	12.2 min
Scheduled departures a day	12	13	14	18,748
Scheduled departures	359	376	5,003	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	134	37%	86.6%	4.2 min	0.7%
DL Delta Air Lines	64	18%	90.6%	-2.4 min	0.0%
UA United Airlines	50	14%	82.0%	10.1 min	0.0%
MQ Envoy Air	49	14%	77.6%	4.3 min	0.0%
AS Alaska Airlines	25	7%	72.0%	1.3 min	0.0%
AA American Airlines	24	7%	70.8%	51.1 min	0.0%
G4 Allegiant Air	13	4%	76.9%	15.5 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MSO–DEN	Missoula to Denver	97	79.4%	17.3 min	0.0%
MSO–SLC	Missoula to Salt Lake City	74	98.6%	-8.5 min	0.0%
MSO–ORD	Missoula to Chicago	73	75.3%	4.4 min	1.4%
MSO–MSP	Missoula to Minneapolis	39	87.2%	-1.8 min	0.0%
MSO–SEA	Missoula to Seattle	25	72.0%	1.3 min	0.0%
MSO–DFW	Missoula to Dallas/Fort Worth	24	70.8%	51.1 min	0.0%
MSO–SFO	Missoula to San Francisco	13	100.0%	-11.5 min	0.0%
MSO–LAS	Missoula to Las Vegas	7	71.4%	32.4 min	0.0%
MSO–AZA	Missoula to Phoenix	6	83.3%	-4.3 min	0.0%
MSO–LAX	Missoula to Los Angeles	1	100.0%	-21.0 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 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	14.2%	34.3%	689
Late-arriving aircraft	13.7%	37.4%	666
National Aviation System	66.0%	22.6%	3,213
Extreme weather	6.2%	5.6%	300
Security	0.0%	0.1%	0

4,868 delay minutes on 59 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 2025?

86.6% of 359 scheduled domestic departures left less than 15 minutes late, and 83.0% reached their destination on time. The national figures that month were 83.1% and 82.8%.

How does that compare with a year earlier?

In September 2024, 85.9% of 376 departures left on time and 0.0% were cancelled, against 86.6% and 0.3% in September 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2025; 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.