Missoula Montana in June 2026

78.8%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 June 2026, reporting carriers scheduled 571 domestic departures from Missoula Montana (MSO). 78.8% left less than 15 minutes late and 80.9% reached their destination on time; 0.5% were cancelled.

Nationally that month, 72.2% of flights departed on time and 72.8% arrived on time, so MSO departures were 6.6 points above the national departure figure.

A year earlier, in June 2025, the airport had 507 departures with 81.5% leaving on time: a change of −2.7 points, with flights up 13%.

Flights arriving at MSO that month were on time 77.8% of the time (571 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 33%, late-arriving aircraft 32% and national aviation system 30%.

On time 80.9%
Arrived 15+ minutes late 18.0%
Cancelled 0.5%
Diverted 0.5%

Every scheduled departure from MSO in June 2026, judged by arrival at the destination.

June 2026 against a year earlier, the airport's year and the nation

Measure	Jun 2026	Jun 2025	MSO, 12 months to Jul 2026	All reported flights, Jun 2026
Departed on time	78.8%	81.5%	83.4%	72.2%
Arrived on time	80.9%	78.3%	82.1%	72.8%
Cancelled	0.5%	0.2%	0.7%	1.6%
Average departure delay (late minutes only)	18.7 min	23.2 min	14.8 min	20.6 min
Scheduled departures a day	19	17	14	20,253
Scheduled departures	571	507	5,003	607,577

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	220	39%	81.4%	3.1 min	0.0%
DL Delta Air Lines	90	16%	91.1%	2.7 min	0.0%
UA United Airlines	90	16%	81.1%	6.0 min	2.2%
AS Alaska Airlines	56	10%	85.7%	0.7 min	0.0%
MQ Envoy Air	56	10%	78.6%	14.7 min	0.0%
AA American Airlines	30	5%	46.7%	84.6 min	3.3%
G4 Allegiant Air	29	5%	75.9%	11.1 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MSO–DEN	Missoula to Denver	96	80.2%	7.8 min	0.0%
MSO–SLC	Missoula to Salt Lake City	90	98.9%	-14.2 min	0.0%
MSO–SEA	Missoula to Seattle	77	84.4%	1.7 min	0.0%
MSO–MSP	Missoula to Minneapolis	60	86.7%	11.1 min	0.0%
MSO–ORD	Missoula to Chicago	60	76.7%	20.6 min	3.3%
MSO–DFW	Missoula to Dallas/Fort Worth	56	62.5%	39.9 min	1.8%
MSO–LAX	Missoula to Los Angeles	52	80.8%	3.6 min	0.0%
MSO–SFO	Missoula to San Francisco	30	56.7%	29.7 min	0.0%
MSO–PDX	Missoula to Portland	21	81.0%	-0.6 min	0.0%
MSO–AZA	Missoula to Phoenix	12	91.7%	0.9 min	0.0%
MSO–SNA	Missoula to Santa Ana	9	55.6%	32.4 min	0.0%
MSO–LAS	Missoula to Las Vegas	8	75.0%	2.3 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), June 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Jun 2026	Minutes
Air carrier	33.3%	30.8%	3,172
Late-arriving aircraft	31.9%	42.1%	3,040
National Aviation System	30.4%	20.3%	2,899
Extreme weather	4.3%	6.7%	406
Security	0.1%	0.1%	7

9,524 delay minutes on 103 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 June 2026?

78.8% of 571 scheduled domestic departures left less than 15 minutes late, and 80.9% reached their destination on time. The national figures that month were 72.2% and 72.8%.

How does that compare with a year earlier?

In June 2025, 81.5% of 507 departures left on time and 0.2% were cancelled, against 78.8% and 0.5% in June 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for June 2026; 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.