Bismarck Municipal in September 2025

85.9%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 369 domestic departures from Bismarck Municipal (BIS). 85.9% left less than 15 minutes late and 85.6% 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 BIS departures were 2.8 points above the national departure figure.

A year earlier, in September 2024, the airport had 351 departures with 85.8% leaving on time: a change of +0.1 points, with flights up 5%.

Flights arriving at BIS that month were on time 82.6% of the time (368 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 59%, national aviation system 29% and late-arriving aircraft 10%.

On time 85.6%
Arrived 15+ minutes late 14.4%
Cancelled 0.0%
Diverted 0.0%

Every scheduled departure from BIS 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	BIS, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	85.9%	85.8%	81.5%	83.1%
Arrived on time	85.6%	86.9%	79.5%	82.8%
Cancelled	0.0%	0.3%	0.7%	0.5%
Average departure delay (late minutes only)	13.0 min	8.5 min	18.7 min	12.2 min
Scheduled departures a day	12	12	11	18,748
Scheduled departures	369	351	3,874	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	243	66%	85.6%	2.6 min	0.0%
MQ Envoy Air	90	24%	83.3%	4.1 min	0.0%
DL Delta Air Lines	19	5%	94.7%	-0.2 min	0.0%
G4 Allegiant Air	17	5%	88.2%	-7.9 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BIS–DEN	Bismarck/Mandan to Denver	137	84.7%	2.8 min	0.0%
BIS–MSP	Bismarck/Mandan to Minneapolis	125	88.0%	1.9 min	0.0%
BIS–DFW	Bismarck/Mandan to Dallas/Fort Worth	60	81.7%	6.3 min	0.0%
BIS–ORD	Bismarck/Mandan to Chicago	30	86.7%	-0.3 min	0.0%
BIS–AZA	Bismarck/Mandan to Phoenix	9	88.9%	-5.8 min	0.0%
BIS–LAS	Bismarck/Mandan to Las Vegas	8	87.5%	-10.4 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	58.5%	34.3%	2,708
Late-arriving aircraft	10.3%	37.4%	477
National Aviation System	29.1%	22.6%	1,348
Extreme weather	2.2%	5.6%	100
Security	0.0%	0.1%	0

4,633 delay minutes on 53 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 September 2025?

85.9% of 369 scheduled domestic departures left less than 15 minutes late, and 85.6% 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, 85.8% of 351 departures left on time and 0.3% were cancelled, against 85.9% 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 BIS · methodology · corrections.