Great Falls International in April 2026

91.6%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 167 domestic departures from Great Falls International (GTF). 91.6% left less than 15 minutes late and 88.6% reached their destination on time; 0.0% were cancelled.

Nationally that month, 79.1% of flights departed on time and 78.9% arrived on time, so GTF departures were 12.5 points above the national departure figure.

A year earlier, in April 2025, the airport had 216 departures with 89.8% leaving on time: a change of +1.8 points, with flights down 23%.

Flights arriving at GTF that month were on time 90.4% of the time (167 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 38%, late-arriving aircraft 36% and national aviation system 24%.

On time 88.6%
Arrived 15+ minutes late 11.4%
Cancelled 0.0%
Diverted 0.0%

Every scheduled departure from GTF 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	GTF, 12 months to Jul 2026	All reported flights, Apr 2026
Departed on time	91.6%	89.8%	88.2%	79.1%
Arrived on time	88.6%	86.1%	87.7%	78.9%
Cancelled	0.0%	0.0%	0.8%	0.9%
Average departure delay (late minutes only)	4.9 min	11.6 min	10.6 min	14.5 min
Scheduled departures a day	6	7	6	19,931
Scheduled departures	167	216	2,168	597,919

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	90	54%	91.1%	-9.0 min	0.0%
UA United Airlines	60	36%	91.7%	-17.6 min	0.0%
G4 Allegiant Air	17	10%	64.7%	17.4 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
GTF–SLC	Great Falls to Salt Lake City	90	91.1%	-9.0 min	0.0%
GTF–DEN	Great Falls to Denver	60	91.7%	-17.6 min	0.0%
GTF–AZA	Great Falls to Phoenix	9	55.6%	34.3 min	0.0%
GTF–LAS	Great Falls to Las Vegas	8	75.0%	-1.6 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	38.4%	33.5%	382
Late-arriving aircraft	35.6%	40.4%	354
National Aviation System	24.3%	21.0%	242
Extreme weather	1.6%	5.0%	16
Security	0.0%	0.1%	0

994 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 April 2026?

91.6% of 167 scheduled domestic departures left less than 15 minutes late, and 88.6% 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, 89.8% of 216 departures left on time and 0.0% were cancelled, against 91.6% and 0.0% 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 GTF · methodology · corrections.