Missoula Montana in December 2025

82.3%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 December 2025, reporting carriers scheduled 356 domestic departures from Missoula Montana (MSO). 82.3% left less than 15 minutes late and 78.9% reached their destination on time; 1.1% were cancelled.

Nationally that month, 72.0% of flights departed on time and 71.9% arrived on time, so MSO departures were 10.3 points above the national departure figure.

A year earlier, in December 2024, the airport had 303 departures with 83.2% leaving on time: a change of −0.9 points, with flights up 17%.

Flights arriving at MSO that month were on time 72.5% of the time (357 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 41%, air carrier 26% and national aviation system 21%.

On time 78.9%
Arrived 15+ minutes late 19.9%
Cancelled 1.1%
Diverted 0.0%

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

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

Measure	Dec 2025	Dec 2024	MSO, 12 months to Jul 2026	All reported flights, Dec 2025
Departed on time	82.3%	83.2%	83.4%	72.0%
Arrived on time	78.9%	83.5%	82.1%	71.9%
Cancelled	1.1%	1.0%	0.7%	1.5%
Average departure delay (late minutes only)	14.0 min	18.0 min	14.8 min	21.2 min
Scheduled departures a day	12	10	14	19,410
Scheduled departures	356	303	5,003	582,304

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	93	26%	80.6%	3.3 min	3.2%
DL Delta Air Lines	62	17%	90.3%	-9.0 min	0.0%
UA United Airlines	62	17%	77.4%	7.6 min	1.6%
AS Alaska Airlines	61	17%	73.8%	6.0 min	0.0%
MQ Envoy Air	45	13%	77.8%	-1.5 min	0.0%
G4 Allegiant Air	32	9%	65.6%	19.0 min	0.0%
F9 Frontier Airlines	1	0%	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	94	73.4%	11.3 min	2.1%
MSO–SLC	Missoula to Salt Lake City	90	88.9%	-4.4 min	2.2%
MSO–SEA	Missoula to Seattle	61	73.8%	6.0 min	0.0%
MSO–DFW	Missoula to Dallas/Fort Worth	31	93.5%	-13.5 min	0.0%
MSO–MSP	Missoula to Minneapolis	31	93.5%	-14.9 min	0.0%
MSO–AZA	Missoula to Phoenix	16	43.8%	37.6 min	0.0%
MSO–LAS	Missoula to Las Vegas	16	87.5%	0.4 min	0.0%
MSO–ORD	Missoula to Chicago	14	42.9%	25.1 min	0.0%
MSO–SFO	Missoula to San Francisco	3	66.7%	5.3 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), December 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2025	Minutes
Air carrier	26.4%	33.3%	1,260
Late-arriving aircraft	41.3%	41.1%	1,971
National Aviation System	21.1%	19.1%	1,009
Extreme weather	11.3%	6.4%	538
Security	0.0%	0.2%	0

4,778 delay minutes on 71 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 December 2025?

82.3% of 356 scheduled domestic departures left less than 15 minutes late, and 78.9% reached their destination on time. The national figures that month were 72.0% and 71.9%.

How does that compare with a year earlier?

In December 2024, 83.2% of 303 departures left on time and 1.0% were cancelled, against 82.3% and 1.1% in December 2025.

Provenance

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