Missoula Montana in August 2025

78.9%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 August 2025, reporting carriers scheduled 536 domestic departures from Missoula Montana (MSO). 78.9% left less than 15 minutes late and 75.0% reached their destination on time; 0.4% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so MSO departures were 2.1 points above the national departure figure.

A year earlier, in August 2024, the airport had 503 departures with 77.9% leaving on time: a change of +1.0 points, with flights up 7%.

Flights arriving at MSO that month were on time 80.0% of the time (535 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 41%, national aviation system 30% and late-arriving aircraft 24%.

On time 75.0%
Arrived 15+ minutes late 23.3%
Cancelled 0.4%
Diverted 1.3%

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

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

Measure	Aug 2025	Aug 2024	MSO, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	78.9%	77.9%	83.4%	76.8%
Arrived on time	75.0%	77.7%	82.1%	76.3%
Cancelled	0.4%	1.2%	0.7%	1.1%
Average departure delay (late minutes only)	17.7 min	14.2 min	14.8 min	17.6 min
Scheduled departures a day	18	17	14	20,079
Scheduled departures	536	503	5,003	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	188	35%	78.7%	5.3 min	0.0%
UA United Airlines	93	17%	73.1%	13.9 min	0.0%
DL Delta Air Lines	91	17%	89.0%	15.1 min	0.0%
MQ Envoy Air	58	11%	65.5%	9.0 min	0.0%
AA American Airlines	41	8%	70.7%	22.8 min	4.9%
AS Alaska Airlines	31	6%	51.6%	18.8 min	0.0%
G4 Allegiant Air	28	5%	60.7%	16.6 min	0.0%
F9 Frontier Airlines	6	1%	83.3%	-11.2 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MSO–DEN	Missoula to Denver	130	70.0%	15.0 min	0.0%
MSO–SLC	Missoula to Salt Lake City	93	90.3%	12.4 min	0.0%
MSO–ORD	Missoula to Chicago	89	65.2%	11.1 min	0.0%
MSO–MSP	Missoula to Minneapolis	60	90.0%	1.6 min	0.0%
MSO–DFW	Missoula to Dallas/Fort Worth	41	70.7%	22.8 min	4.9%
MSO–LAX	Missoula to Los Angeles	31	74.2%	2.9 min	0.0%
MSO–SEA	Missoula to Seattle	31	51.6%	18.8 min	0.0%
MSO–SFO	Missoula to San Francisco	30	96.7%	-9.2 min	0.0%
MSO–AZA	Missoula to Phoenix	9	77.8%	1.1 min	0.0%
MSO–LAS	Missoula to Las Vegas	9	55.6%	29.7 min	0.0%
MSO–SNA	Missoula to Santa Ana	6	66.7%	10.0 min	0.0%
MSO–OAK	Missoula to Oakland	4	25.0%	32.3 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), August 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	41.3%	33.1%	3,901
Late-arriving aircraft	24.4%	40.5%	2,309
National Aviation System	29.5%	19.2%	2,786
Extreme weather	4.8%	7.0%	449
Security	0.0%	0.1%	0

9,445 delay minutes on 125 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 August 2025?

78.9% of 536 scheduled domestic departures left less than 15 minutes late, and 75.0% reached their destination on time. The national figures that month were 76.8% and 76.3%.

How does that compare with a year earlier?

In August 2024, 77.9% of 503 departures left on time and 1.2% were cancelled, against 78.9% and 0.4% in August 2025.

Provenance

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