Bismarck Municipal in May 2026

85.6%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 2026, reporting carriers scheduled 306 domestic departures from Bismarck Municipal (BIS). 85.6% left less than 15 minutes late and 84.3% reached their destination on time; 0.0% were cancelled.

Nationally that month, 77.1% of flights departed on time and 77.6% arrived on time, so BIS departures were 8.5 points above the national departure figure.

A year earlier, in May 2025, the airport had 289 departures with 82.0% leaving on time: a change of +3.6 points, with flights up 6%.

Flights arriving at BIS that month were on time 84.9% of the time (305 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 45%, national aviation system 25% and late-arriving aircraft 16%.

On time 84.3%
Arrived 15+ minutes late 15.0%
Cancelled 0.0%
Diverted 0.7%

Every scheduled departure from BIS in May 2026, judged by arrival at the destination.

May 2026 against a year earlier, the airport's year and the nation

Measure	May 2026	May 2025	BIS, 12 months to Jul 2026	All reported flights, May 2026
Departed on time	85.6%	82.0%	81.5%	77.1%
Arrived on time	84.3%	78.9%	79.5%	77.6%
Cancelled	0.0%	0.7%	0.7%	0.9%
Average departure delay (late minutes only)	9.9 min	19.4 min	18.7 min	16.0 min
Scheduled departures a day	10	10	11	20,391
Scheduled departures	306	289	3,874	611,735

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	159	52%	86.8%	-5.0 min	0.0%
MQ Envoy Air	93	30%	84.9%	-6.3 min	0.0%
DL Delta Air Lines	31	10%	83.9%	12.2 min	0.0%
G4 Allegiant Air	23	8%	65.2%	9.3 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BIS–DEN	Bismarck/Mandan to Denver	121	84.3%	-3.0 min	0.0%
BIS–MSP	Bismarck/Mandan to Minneapolis	69	89.9%	-0.7 min	0.0%
BIS–DFW	Bismarck/Mandan to Dallas/Fort Worth	62	83.9%	-5.8 min	0.0%
BIS–ORD	Bismarck/Mandan to Chicago	31	87.1%	-7.0 min	0.0%
BIS–AZA	Bismarck/Mandan to Phoenix	14	57.1%	9.0 min	0.0%
BIS–LAS	Bismarck/Mandan to Las Vegas	9	77.8%	9.8 min	0.0%

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), May 2026.

Delay causes

BTS cause category	Share of delay minutes	National, May 2026	Minutes
Air carrier	45.3%	33.0%	1,259
Late-arriving aircraft	15.7%	40.4%	437
National Aviation System	25.1%	20.5%	696
Extreme weather	7.5%	6.0%	208
Security	6.4%	0.1%	178

2,778 delay minutes on 46 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 2026?

85.6% of 306 scheduled domestic departures left less than 15 minutes late, and 84.3% reached their destination on time. The national figures that month were 77.1% and 77.6%.

How does that compare with a year earlier?

In May 2025, 82.0% of 289 departures left on time and 0.7% were cancelled, against 85.6% and 0.0% in May 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 2026; 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.