Best time to fly Bismarck/Mandan to Denver
Every month pooled across the years on record, so "July" means July generally rather than one particular July. Full BIS to DEN record →
Best month
October
89.3% on time · 244 flights
Worst month
January
68% on time · 243 flights
| Month | Flights | On time | Cancelled | When late, by |
|---|---|---|---|---|
| January | 243 | 68% | 0.82% | 114 min |
| February | 218 | 75.8% | 3.67% | 122 min |
| March | 244 | 80.5% | 1.23% | 91 min |
| April | 239 | 69.7% | 0% | 97 min |
| May | 255 | 77.6% | 0.78% | 88 min |
| June | 266 | 75.4% | 0.75% | 118 min |
| July | 247 | 76.2% | 0.4% | 85 min |
| August | 258 | 74.6% | 0% | 105 min |
| September | 257 | 84.8% | 0% | 87 min |
| October | 244 | 89.3% | 0% | 110 min |
| November | 234 | 82.8% | 2.56% | 77 min |
| December | 247 | 74.8% | 0% | 132 min |
What a seasonal pattern can and cannot tell you
Months differ for reasons that repeat — summer thunderstorms in the American interior, winter fog and de-icing in northern Europe, school holidays filling every seat and leaving no slack in the schedule. Those are real and they come back each year.
What the pattern cannot do is forecast a particular flight. A quiet month has late days and a bad month has punctual ones. Treat this as a way to choose between two dates you are indifferent about, not as a promise.