Billings Logan International in May 2025

81.0%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 384 domestic departures from Billings Logan International (BIL). 81.0% left less than 15 minutes late and 79.7% reached their destination on time; 0.5% were cancelled.

Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so BIL departures were 4.3 points above the national departure figure.

A year earlier, in May 2024, the airport had 341 departures with 83.0% leaving on time: a change of −2.0 points, with flights up 13%.

Flights arriving at BIL that month were on time 77.3% of the time (384 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, national aviation system 46%, air carrier 22% and late-arriving aircraft 18%.

On time 79.7%
Arrived 15+ minutes late 19.3%
Cancelled 0.5%
Diverted 0.5%

Every scheduled departure from BIL 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	BIL, 12 months to Jul 2026	All reported flights, May 2025
Departed on time	81.0%	83.0%	87.4%	76.7%
Arrived on time	79.7%	81.8%	84.7%	75.4%
Cancelled	0.5%	0.6%	0.6%	1.0%
Average departure delay (late minutes only)	19.9 min	25.7 min	11.8 min	17.5 min
Scheduled departures a day	13	11	13	20,188
Scheduled departures	384	341	4,642	605,648

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	175	46%	79.4%	15.1 min	1.1%
DL Delta Air Lines	62	16%	95.2%	-13.0 min	0.0%
MQ Envoy Air	62	16%	75.8%	6.9 min	0.0%
UA United Airlines	62	16%	66.1%	26.5 min	0.0%
G4 Allegiant Air	23	6%	87.0%	1.1 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BIL–DEN	Billings to Denver	165	67.9%	29.5 min	1.2%
BIL–SLC	Billings to Salt Lake City	93	96.8%	-11.7 min	0.0%
BIL–DFW	Billings to Dallas/Fort Worth	62	75.8%	6.9 min	0.0%
BIL–MSP	Billings to Minneapolis	31	93.5%	-7.9 min	0.0%
BIL–AZA	Billings to Phoenix	12	83.3%	13.3 min	0.0%
BIL–LAS	Billings to Las Vegas	11	90.9%	-12.3 min	0.0%
BIL–ORD	Billings to Chicago	10	80.0%	-2.3 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	22.4%	29.3%	1,778
Late-arriving aircraft	18.1%	37.8%	1,440
National Aviation System	46.2%	25.9%	3,673
Extreme weather	13.4%	6.9%	1,064
Security	0.0%	0.1%	0

7,955 delay minutes on 74 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 May 2025?

81.0% of 384 scheduled domestic departures left less than 15 minutes late, and 79.7% 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, 83.0% of 341 departures left on time and 0.6% were cancelled, against 81.0% and 0.5% 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 BIL · methodology · corrections.