Bismarck Municipal in May 2025

82.0%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 289 domestic departures from Bismarck Municipal (BIS). 82.0% left less than 15 minutes late and 78.9% reached their destination on time; 0.7% were cancelled.

Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so BIS departures were 5.3 points above the national departure figure.

A year earlier, in May 2024, the airport had 347 departures with 85.6% leaving on time: a change of −3.6 points, with flights down 17%.

Flights arriving at BIS that month were on time 76.6% of the time (290 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 44%, late-arriving aircraft 31% and national aviation system 24%.

On time 78.9%
Arrived 15+ minutes late 19.0%
Cancelled 0.7%
Diverted 1.4%

Every scheduled departure from BIS 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	BIS, 12 months to Jul 2026	All reported flights, May 2025
Departed on time	82.0%	85.6%	81.5%	76.7%
Arrived on time	78.9%	83.0%	79.5%	75.4%
Cancelled	0.7%	0.6%	0.7%	1.0%
Average departure delay (late minutes only)	19.4 min	15.2 min	18.7 min	17.5 min
Scheduled departures a day	10	12	11	20,188
Scheduled departures	289	347	3,874	605,648

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	144	50%	70.8%	19.1 min	1.4%
MQ Envoy Air	62	21%	72.6%	18.3 min	0.0%
DL Delta Air Lines	57	20%	98.2%	-16.4 min	0.0%
G4 Allegiant Air	26	9%	96.2%	-18.5 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BIS–DEN	Bismarck/Mandan to Denver	134	68.7%	21.4 min	1.5%
BIS–MSP	Bismarck/Mandan to Minneapolis	67	98.5%	-15.5 min	0.0%
BIS–DFW	Bismarck/Mandan to Dallas/Fort Worth	62	72.6%	18.3 min	0.0%
BIS–AZA	Bismarck/Mandan to Phoenix	17	100.0%	-18.6 min	0.0%
BIS–LAS	Bismarck/Mandan to Las Vegas	9	88.9%	-18.2 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	43.7%	29.3%	2,460
Late-arriving aircraft	31.0%	37.8%	1,742
National Aviation System	23.5%	25.9%	1,320
Extreme weather	1.9%	6.9%	106
Security	0.0%	0.1%	0

5,628 delay minutes on 55 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 BIS on time in May 2025?

82.0% of 289 scheduled domestic departures left less than 15 minutes late, and 78.9% 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, 85.6% of 347 departures left on time and 0.6% were cancelled, against 82.0% and 0.7% 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 BIS · methodology · corrections.