Great Falls International in September 2025

90.8%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 September 2025, reporting carriers scheduled 196 domestic departures from Great Falls International (GTF). 90.8% left less than 15 minutes late and 90.3% reached their destination on time; 0.0% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so GTF departures were 7.7 points above the national departure figure.

A year earlier, in September 2024, the airport had 180 departures with 93.3% leaving on time: a change of −2.5 points, with flights up 9%.

Flights arriving at GTF that month were on time 87.7% of the time (195 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 42%, national aviation system 35% and late-arriving aircraft 18%.

On time 90.3%
Arrived 15+ minutes late 9.7%
Cancelled 0.0%
Diverted 0.0%

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

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

Measure	Sep 2025	Sep 2024	GTF, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	90.8%	93.3%	88.2%	83.1%
Arrived on time	90.3%	95.0%	87.7%	82.8%
Cancelled	0.0%	0.0%	0.8%	0.5%
Average departure delay (late minutes only)	7.0 min	3.9 min	10.6 min	12.2 min
Scheduled departures a day	7	6	6	18,748
Scheduled departures	196	180	2,168	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	127	65%	92.9%	-8.9 min	0.0%
UA United Airlines	60	31%	85.0%	1.2 min	0.0%
G4 Allegiant Air	9	5%	88.9%	-1.2 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
GTF–SLC	Great Falls to Salt Lake City	90	96.7%	-11.3 min	0.0%
GTF–DEN	Great Falls to Denver	60	85.0%	1.2 min	0.0%
GTF–SEA	Great Falls to Seattle	30	83.3%	-3.3 min	0.0%
GTF–LAS	Great Falls to Las Vegas	9	88.9%	-1.2 min	0.0%
GTF–MSP	Great Falls to Minneapolis	7	85.7%	-2.0 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), September 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	42.3%	34.3%	561
Late-arriving aircraft	17.7%	37.4%	234
National Aviation System	34.6%	22.6%	458
Extreme weather	5.4%	5.6%	72
Security	0.0%	0.1%	0

1,325 delay minutes on 19 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 September 2025?

90.8% of 196 scheduled domestic departures left less than 15 minutes late, and 90.3% reached their destination on time. The national figures that month were 83.1% and 82.8%.

How does that compare with a year earlier?

In September 2024, 93.3% of 180 departures left on time and 0.0% were cancelled, against 90.8% and 0.0% in September 2025.

Provenance

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