Airport reliability

Bismarck/Mandan (BIS) on-time performance

How reliably flights leave Bismarck/Mandan, ND (BIS) and reach their destinations, by airline, departure hour and month, September 2025 to August 2026.

Historical performance Official DOT data through August 2026 · Not live flight status

Bismarck/Mandan, ND3,798 departures in 12 months

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Departures on time: 79.5%
Cancelled: 0.8%
60+ minutes late: 8.2%
Scheduled departures: 3,798

What this means

BIS departures beat the U.S. average.

79.5% of the 3,798 scheduled departures from Bismarck/Mandan (BIS) arrived at their destination on time, 3.9 points higher than the U.S. average of 75.6%.
0.8% of departures were cancelled (U.S. average 1.9%), and 8.2% arrived an hour or more late.
Flights arriving at BIS were on time 79.5% of the time.
Among airlines with at least 300 departures, Delta Air Lines was the most punctual from BIS (83.3%) and Allegiant Air the least (69.8%).
Over the last 3 years, October was the most reliable month for departures from BIS (86.3% on time) and January the least reliable (72.8%).
Flights scheduled to depart 6 am to 7 am were the most punctual (87.0% on time); flights scheduled to depart 6 pm to 7 pm were the least (57.7%).

Airlines at BIS

Ranked by on-time arrival

Departures from BIS, September 2025 to August 2026. On time means arrived at the destination within 15 minutes of schedule.
Airline	On time	Cancelled	60+ min late	Avg delay when late	Departures
Delta Air Lines	83.3%	0.3%	5.2%	82 min	348
SkyWest AirlinesSold as United Express, Delta Connection, American Eagle, Alaska	80.7%	0.8%	8.6%	102 min	2,078
Envoy AirSold as American Eagle	79.5%	0.9%	8.0%	93 min	998
Allegiant Air	69.8%	1.1%	9.6%	77 min	374

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On-time rate by departure hour

<6a 86.5%

6a 87.0%

7a 78.2%

8a 82.2%

9a 79.4%

10a Insufficient sample

11a 84.0%

12p 78.4%

1p 79.7%

2p 75.3%

3p Insufficient sample

4p Insufficient sample

5p 74.8%

6p 57.7%

7p Insufficient sample

8p Insufficient sample

9p Insufficient sample

10p Insufficient sample

Share of scheduled flights on time BIS average 79.5%

Departures from BIS by scheduled local departure hour, September 2025 to August 2026. Scale starts at zero.

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Period	On time	Flights
Departing before 6 am	86.5%	378
Departing 6 am to 7 am	87.0%	593
Departing 7 am to 8 am	78.2%	133
Departing 8 am to 9 am	82.2%	213
Departing 9 am to 10 am	79.4%	272
Departing 10 am to 11 am	Insufficient sample	21
Departing 11 am to noon	84.0%	282
Departing noon to 1 pm	78.4%	236
Departing 1 pm to 2 pm	79.7%	664
Departing 2 pm to 3 pm	75.3%	308
Departing 3 pm to 4 pm	Insufficient sample	17
Departing 4 pm to 5 pm	Insufficient sample	6
Departing 5 pm to 6 pm	74.8%	389
Departing 6 pm to 7 pm	57.7%	137
Departing 7 pm to 8 pm	Insufficient sample	27
Departing 8 pm to 9 pm	Insufficient sample	40
Departing 9 pm to 10 pm	Insufficient sample	44
Departing 10 pm to 11 pm	Insufficient sample	38

Best and worst months at BIS

Jan 72.8%

Feb 77.0%

Mar 81.4%

Apr 80.0%

May 82.2%

Jun 75.5%

Jul 76.6%

Aug 79.4%

Sep 86.1%

Oct 86.3%

Nov 81.3%

Dec 74.1%

Share of scheduled flights on time 12-month average 79.5%

Departures from BIS by calendar month, September 2023 to August 2026 pooled. Scale starts at zero.

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Period	On time	Flights
January	72.8%	909
February	77.0%	844
March	81.4%	993
April	80.0%	962
May	82.2%	942
June	75.5%	1,046
July	76.6%	1,102
August	79.4%	1,078
September	86.1%	1,003
October	86.3%	1,046
November	81.3%	921
December	74.1%	1,037

Month by month, last 12 months

Sep 85.6%

Oct 85.6%

Nov 82.5%

Dec 64.2%

Jan 74.1%

Feb 81.5%

Mar 74.7%

Apr 78.3%

May 84.3%

Jun 81.5%

Jul 83.9%

Aug 78.2%

Share of scheduled flights on time U.S. average 75.6%

Departures from BIS, September 2025 to August 2026. Scale starts at zero.

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Period	On time	Flights
Sep 2025	85.6%	369
Oct 2025	85.6%	334
Nov 2025	82.5%	280
Dec 2025	64.2%	366
Jan 2026	74.1%	266
Feb 2026	81.5%	233
Mar 2026	74.7%	293
Apr 2026	78.3%	336
May 2026	84.3%	306
Jun 2026	81.5%	335
Jul 2026	83.9%	355
Aug 2026	78.2%	325

Busiest routes from BIS

Nonstop routes from BIS by scheduled flights, September 2025 to August 2026.
To	On time	Cancelled	Airlines	Flights
Denver (DEN)	78.9%	0.7%	1	1,433
Minneapolis (MSP)	84.1%	0.7%	2	989
Dallas/Fort Worth (DFW)	80.9%	1.1%	1	728
Chicago (ORD)	75.5%	0.4%	2	274
Phoenix (AZA)	66.3%	1.2%	1	243
Las Vegas (LAS)	79.3%	0.9%	1	116

Airliner parked at a terminal gate — Photo: Depositphotos (licensed stock, illustrative only). Credits

Sources & data dates

Source: U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
Period: September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
Data through: August 2026
Processed: 2026-11-03
Scope: Scheduled nonstop domestic departures from Bismarck/Mandan, ND (BIS) by airlines that report to the DOT.
Method: Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.

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