Billings Logan International in September 2025

89.3%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 458 domestic departures from Billings Logan International (BIL). 89.3% left less than 15 minutes late and 86.0% reached their destination on time; 0.2% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so BIL departures were 6.2 points above the national departure figure.

A year earlier, in September 2024, the airport had 375 departures with 92.0% leaving on time: a change of −2.7 points, with flights up 22%.

Flights arriving at BIL that month were on time 86.2% of the time (458 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, national aviation system 35%, late-arriving aircraft 30% and air carrier 29%.

On time 86.0%
Arrived 15+ minutes late 13.5%
Cancelled 0.2%
Diverted 0.2%

Every scheduled departure from BIL 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	BIL, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	89.3%	92.0%	87.4%	83.1%
Arrived on time	86.0%	90.7%	84.7%	82.8%
Cancelled	0.2%	0.3%	0.6%	0.5%
Average departure delay (late minutes only)	7.5 min	8.1 min	11.8 min	12.2 min
Scheduled departures a day	15	13	13	18,748
Scheduled departures	458	375	4,642	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	197	43%	84.3%	-0.2 min	0.0%
MQ Envoy Air	120	26%	84.2%	0.1 min	0.8%
DL Delta Air Lines	60	13%	100.0%	-17.3 min	0.0%
UA United Airlines	60	13%	80.0%	3.3 min	0.0%
G4 Allegiant Air	21	5%	90.5%	-2.6 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BIL–DEN	Billings to Denver	167	80.2%	3.0 min	0.0%
BIL–ORD	Billings to Chicago	90	80.0%	5.7 min	0.0%
BIL–SLC	Billings to Salt Lake City	90	97.8%	-13.7 min	0.0%
BIL–DFW	Billings to Dallas/Fort Worth	60	85.0%	-4.2 min	1.7%
BIL–MSP	Billings to Minneapolis	30	100.0%	-13.7 min	0.0%
BIL–AZA	Billings to Phoenix	12	91.7%	-3.5 min	0.0%
BIL–LAS	Billings to Las Vegas	9	88.9%	-1.4 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	28.9%	34.3%	1,064
Late-arriving aircraft	30.1%	37.4%	1,107
National Aviation System	34.6%	22.6%	1,274
Extreme weather	6.3%	5.6%	232
Security	0.0%	0.1%	0

3,677 delay minutes on 62 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 BIL on time in September 2025?

89.3% of 458 scheduled domestic departures left less than 15 minutes late, and 86.0% 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, 92.0% of 375 departures left on time and 0.3% were cancelled, against 89.3% and 0.2% 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 BIL · methodology · corrections.