Great Falls International in August 2025

86.7%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 211 domestic departures from Great Falls International (GTF). 86.7% left less than 15 minutes late and 85.3% reached their destination on time; 0.5% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so GTF departures were 9.9 points above the national departure figure.

A year earlier, in August 2024, the airport had 193 departures with 93.3% leaving on time: a change of −6.6 points, with flights up 9%.

Flights arriving at GTF that month were on time 84.4% of the time (211 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, extreme weather 41%, air carrier 33% and national aviation system 19%.

On time 85.3%
Arrived 15+ minutes late 13.7%
Cancelled 0.5%
Diverted 0.5%

Every scheduled departure from GTF 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	GTF, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	86.7%	93.3%	88.2%	76.8%
Arrived on time	85.3%	90.7%	87.7%	76.3%
Cancelled	0.5%	0.5%	0.8%	1.1%
Average departure delay (late minutes only)	11.1 min	4.5 min	10.6 min	17.6 min
Scheduled departures a day	7	6	6	20,079
Scheduled departures	211	193	2,168	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	137	65%	91.2%	-2.4 min	0.0%
UA United Airlines	62	29%	71.0%	11.6 min	1.6%
G4 Allegiant Air	12	6%	91.7%	-11.5 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
GTF–SLC	Great Falls to Salt Lake City	91	91.2%	-2.5 min	0.0%
GTF–DEN	Great Falls to Denver	62	71.0%	11.6 min	1.6%
GTF–MSP	Great Falls to Minneapolis	31	96.8%	-1.5 min	0.0%
GTF–SEA	Great Falls to Seattle	12	83.3%	-4.2 min	0.0%
GTF–LAS	Great Falls to Las Vegas	9	100.0%	-15.7 min	0.0%
GTF–AZA	Great Falls to Phoenix	3	66.7%	1.0 min	0.0%
GTF–ORD	Great Falls to Chicago	3	66.7%	-4.5 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), August 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	33.2%	33.1%	791
Late-arriving aircraft	6.7%	40.5%	160
National Aviation System	19.1%	19.2%	454
Extreme weather	41.0%	7.0%	975
Security	0.0%	0.1%	0

2,380 delay minutes on 29 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 August 2025?

86.7% of 211 scheduled domestic departures left less than 15 minutes late, and 85.3% 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, 93.3% of 193 departures left on time and 0.5% were cancelled, against 86.7% and 0.5% 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 GTF · methodology · corrections.