Bismarck/Mandan (BIS) to Denver (DEN): On-Time Performance
Data through July 2026
When you fly BIS to DEN matters as much as anything else about the booking: the route swung from 92% on-time in October 2024 to just 62% in January 2025. Across the full period the route averages 77% on-time against a national 78%. Morning departures also hold up better than evening ones (80% vs 61%), which matters most in the rough months.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 24 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 4.0
- last 12 months
- Duration
- 2h 4m
- scheduled
- Distance
- 516 mi
Monthly on-time trend
Best time to fly from BIS to DEN
Aim for departures around 6 a.m. (89% on-time); avoid 5 p.m. departures (60%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 29 min |
| Tuesdaybest | 79% | 23 min |
| Wednesday | 78% | 17 min |
| Thursday | 75% | 24 min |
| Friday | 77% | 23 min |
| Saturday | 77% | 26 min |
| Sunday | 77% | 25 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft21%
- Airline operations51%
- National airspace system21%
- Weather7%
Frequently asked questions
- How often are flights from BIS to DEN delayed?
- 23% of BIS–DEN flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 24 minutes.
- What is the best time of day to fly from BIS to DEN?
- Departures around 6 a.m. have the best record (89% on-time), while departures around 5 p.m. have the worst (60%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BIS to DEN?
- The scheduled BIS–DEN flight time averages 2h 4m over 516 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are BIS to DEN flights cancelled?
- 0.8% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from BIS to DEN?
- January 2025 was the roughest month in this dataset, with only 62% of arrivals on time. The best was October 2024 at 92%. If your dates are flexible, that 30-point gap is worth planning around.
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Based on 3,070 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.