Great Falls International in May 2025

87.4%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 May 2025, reporting carriers scheduled 223 domestic departures from Great Falls International (GTF). 87.4% left less than 15 minutes late and 85.2% reached their destination on time; 0.0% were cancelled.

Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so GTF departures were 10.7 points above the national departure figure.

A year earlier, in May 2024, the airport had 210 departures with 90.5% leaving on time: a change of −3.1 points, with flights up 6%.

Flights arriving at GTF that month were on time 84.3% of the time (223 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 40%, national aviation system 28% and extreme weather 17%.

On time 85.2%
Arrived 15+ minutes late 14.3%
Cancelled 0.0%
Diverted 0.4%

Every scheduled departure from GTF in May 2025, judged by arrival at the destination.

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

Measure	May 2025	May 2024	GTF, 12 months to Jul 2026	All reported flights, May 2025
Departed on time	87.4%	90.5%	88.2%	76.7%
Arrived on time	85.2%	87.6%	87.7%	75.4%
Cancelled	0.0%	0.0%	0.8%	1.0%
Average departure delay (late minutes only)	9.4 min	7.4 min	10.6 min	17.5 min
Scheduled departures a day	7	7	6	20,188
Scheduled departures	223	210	2,168	605,648

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	186	83%	88.7%	-5.1 min	0.0%
UA United Airlines	19	9%	63.2%	28.7 min	0.0%
G4 Allegiant Air	18	8%	72.2%	11.4 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
GTF–SLC	Great Falls to Salt Lake City	93	94.6%	-10.4 min	0.0%
GTF–DEN	Great Falls to Denver	62	77.4%	6.9 min	0.0%
GTF–MSP	Great Falls to Minneapolis	31	90.3%	-0.8 min	0.0%
GTF–SEA	Great Falls to Seattle	17	64.7%	12.5 min	0.0%
GTF–AZA	Great Falls to Phoenix	9	66.7%	23.6 min	0.0%
GTF–LAS	Great Falls to Las Vegas	9	77.8%	-0.8 min	0.0%
GTF–ORD	Great Falls to Chicago	2	100.0%	-22.0 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), May 2025.

Delay causes

BTS cause category	Share of delay minutes	National, May 2025	Minutes
Air carrier	40.1%	29.3%	853
Late-arriving aircraft	15.3%	37.8%	325
National Aviation System	28.1%	25.9%	597
Extreme weather	16.5%	6.9%	352
Security	0.0%	0.1%	0

2,127 delay minutes on 32 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 GTF on time in May 2025?

87.4% of 223 scheduled domestic departures left less than 15 minutes late, and 85.2% reached their destination on time. The national figures that month were 76.7% and 75.4%.

How does that compare with a year earlier?

In May 2024, 90.5% of 210 departures left on time and 0.0% were cancelled, against 87.4% and 0.0% in May 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for GTF · methodology · corrections.