Bismarck Municipal in August 2025

80.3%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 August 2025, reporting carriers scheduled 401 domestic departures from Bismarck Municipal (BIS). 80.3% left less than 15 minutes late and 78.3% reached their destination on time; 0.0% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so BIS departures were 3.5 points above the national departure figure.

A year earlier, in August 2024, the airport had 352 departures with 84.9% leaving on time: a change of −4.6 points, with flights up 14%.

Flights arriving at BIS that month were on time 75.3% of the time (401 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 60%, national aviation system 24% and late-arriving aircraft 11%.

On time 78.3%
Arrived 15+ minutes late 20.7%
Cancelled 0.0%
Diverted 1.0%

Every scheduled departure from BIS in August 2025, judged by arrival at the destination.

August 2025 against a year earlier, the airport's year and the nation

Measure	Aug 2025	Aug 2024	BIS, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	80.3%	84.9%	81.5%	76.8%
Arrived on time	78.3%	81.8%	79.5%	76.3%
Cancelled	0.0%	0.0%	0.7%	1.1%
Average departure delay (late minutes only)	19.4 min	11.7 min	18.7 min	17.6 min
Scheduled departures a day	13	12	11	20,079
Scheduled departures	401	352	3,874	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	232	58%	74.6%	16.5 min	0.0%
MQ Envoy Air	92	23%	77.2%	2.9 min	0.0%
DL Delta Air Lines	58	14%	87.9%	1.7 min	0.0%
G4 Allegiant Air	19	5%	100.0%	-11.1 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BIS–DEN	Bismarck/Mandan to Denver	152	71.7%	19.9 min	0.0%
BIS–MSP	Bismarck/Mandan to Minneapolis	138	83.3%	6.6 min	0.0%
BIS–DFW	Bismarck/Mandan to Dallas/Fort Worth	61	73.8%	5.2 min	0.0%
BIS–ORD	Bismarck/Mandan to Chicago	31	83.9%	-1.5 min	0.0%
BIS–AZA	Bismarck/Mandan to Phoenix	10	100.0%	-10.4 min	0.0%
BIS–LAS	Bismarck/Mandan to Las Vegas	9	100.0%	-11.8 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), August 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	59.6%	33.1%	4,344
Late-arriving aircraft	10.9%	40.5%	791
National Aviation System	24.4%	19.2%	1,775
Extreme weather	5.2%	7.0%	376
Security	0.0%	0.1%	0

7,286 delay minutes on 83 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 August 2025?

80.3% of 401 scheduled domestic departures left less than 15 minutes late, and 78.3% reached their destination on time. The national figures that month were 76.8% and 76.3%.

How does that compare with a year earlier?

In August 2024, 84.9% of 352 departures left on time and 0.0% were cancelled, against 80.3% and 0.0% in August 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 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.