Bismarck Municipal in December 2025

64.8%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 December 2025, reporting carriers scheduled 366 domestic departures from Bismarck Municipal (BIS). 64.8% left less than 15 minutes late and 64.2% reached their destination on time; 1.9% were cancelled.

Nationally that month, 72.0% of flights departed on time and 71.9% arrived on time, so BIS departures were 7.2 points below the national departure figure.

A year earlier, in December 2024, the airport had 389 departures with 76.1% leaving on time: a change of −11.3 points, with flights down 6%.

Flights arriving at BIS that month were on time 68.2% of the time (365 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 46%, late-arriving aircraft 25% and national aviation system 17%.

On time 64.2%
Arrived 15+ minutes late 33.6%
Cancelled 1.9%
Diverted 0.3%

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

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

Measure	Dec 2025	Dec 2024	BIS, 12 months to Jul 2026	All reported flights, Dec 2025
Departed on time	64.8%	76.1%	81.5%	72.0%
Arrived on time	64.2%	73.0%	79.5%	71.9%
Cancelled	1.9%	0.5%	0.7%	1.5%
Average departure delay (late minutes only)	43.0 min	21.3 min	18.7 min	21.2 min
Scheduled departures a day	12	13	11	19,410
Scheduled departures	366	389	3,874	582,304

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	201	55%	62.2%	42.1 min	1.0%
MQ Envoy Air	91	25%	70.3%	13.2 min	2.2%
G4 Allegiant Air	43	12%	65.1%	34.9 min	7.0%
DL Delta Air Lines	31	8%	58.1%	24.4 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BIS–DEN	Bismarck/Mandan to Denver	122	66.4%	48.0 min	0.0%
BIS–MSP	Bismarck/Mandan to Minneapolis	108	56.5%	30.8 min	1.9%
BIS–DFW	Bismarck/Mandan to Dallas/Fort Worth	62	74.2%	1.0 min	1.6%
BIS–ORD	Bismarck/Mandan to Chicago	31	61.3%	37.7 min	3.2%
BIS–AZA	Bismarck/Mandan to Phoenix	25	60.0%	50.0 min	8.0%
BIS–LAS	Bismarck/Mandan to Las Vegas	18	72.2%	14.5 min	5.6%

By scheduled departure hour

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), December 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2025	Minutes
Air carrier	46.4%	33.3%	7,057
Late-arriving aircraft	25.0%	41.1%	3,808
National Aviation System	16.5%	19.1%	2,508
Extreme weather	11.9%	6.4%	1,818
Security	0.2%	0.2%	24

15,215 delay minutes on 123 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 December 2025?

64.8% of 366 scheduled domestic departures left less than 15 minutes late, and 64.2% reached their destination on time. The national figures that month were 72.0% and 71.9%.

How does that compare with a year earlier?

In December 2024, 76.1% of 389 departures left on time and 0.5% were cancelled, against 64.8% and 1.9% in December 2025.

Provenance

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