Missoula Montana in April 2026

87.1%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 April 2026, reporting carriers scheduled 389 domestic departures from Missoula Montana (MSO). 87.1% left less than 15 minutes late and 86.1% reached their destination on time; 0.3% were cancelled.

Nationally that month, 79.1% of flights departed on time and 78.9% arrived on time, so MSO departures were 8.0 points above the national departure figure.

A year earlier, in April 2025, the airport had 294 departures with 85.0% leaving on time: a change of +2.1 points, with flights up 32%.

Flights arriving at MSO that month were on time 85.6% of the time (388 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 47%, air carrier 30% and national aviation system 18%.

On time 86.1%
Arrived 15+ minutes late 12.9%
Cancelled 0.3%
Diverted 0.8%

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

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

Measure	Apr 2026	Apr 2025	MSO, 12 months to Jul 2026	All reported flights, Apr 2026
Departed on time	87.1%	85.0%	83.4%	79.1%
Arrived on time	86.1%	81.3%	82.1%	78.9%
Cancelled	0.3%	0.3%	0.7%	0.9%
Average departure delay (late minutes only)	9.8 min	15.2 min	14.8 min	14.5 min
Scheduled departures a day	13	10	14	19,931
Scheduled departures	389	294	5,003	597,919

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	111	29%	89.2%	-2.7 min	0.0%
DL Delta Air Lines	90	23%	88.9%	-8.3 min	0.0%
MQ Envoy Air	60	15%	80.0%	1.5 min	0.0%
UA United Airlines	60	15%	91.7%	-9.5 min	0.0%
AS Alaska Airlines	48	12%	83.3%	-3.0 min	2.1%
G4 Allegiant Air	20	5%	65.0%	24.1 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MSO–DEN	Missoula to Denver	90	91.1%	-6.5 min	0.0%
MSO–SLC	Missoula to Salt Lake City	90	84.4%	-3.6 min	0.0%
MSO–SEA	Missoula to Seattle	78	89.7%	-6.2 min	1.3%
MSO–DFW	Missoula to Dallas/Fort Worth	30	90.0%	-9.3 min	0.0%
MSO–MSP	Missoula to Minneapolis	30	93.3%	-10.8 min	0.0%
MSO–ORD	Missoula to Chicago	30	70.0%	13.1 min	0.0%
MSO–PDX	Missoula to Portland	21	85.7%	-1.8 min	0.0%
MSO–AZA	Missoula to Phoenix	12	66.7%	17.8 min	0.0%
MSO–LAS	Missoula to Las Vegas	8	62.5%	33.5 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), April 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Apr 2026	Minutes
Air carrier	30.1%	33.5%	944
Late-arriving aircraft	46.9%	40.4%	1,473
National Aviation System	18.2%	21.0%	570
Extreme weather	4.8%	5.0%	152
Security	0.0%	0.1%	0

3,139 delay minutes on 50 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 April 2026?

87.1% of 389 scheduled domestic departures left less than 15 minutes late, and 86.1% reached their destination on time. The national figures that month were 79.1% and 78.9%.

How does that compare with a year earlier?

In April 2025, 85.0% of 294 departures left on time and 0.3% were cancelled, against 87.1% and 0.3% in April 2026.

Provenance

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