Best time to fly Riverton/Lander to Denver
Every month pooled across the years on record, so "July" means July generally rather than one particular July. Full RIW to DEN record →
Best month
September
92.4% on time · 120 flights
Worst month
June
74.2% on time · 120 flights
| Month | Flights | On time | Cancelled | When late, by |
|---|---|---|---|---|
| January | 124 | 83.5% | 2.42% | 249 min |
| February | 111 | 89.2% | 0% | 214 min |
| March | 124 | 83.9% | 0% | 140 min |
| April | 120 | 78.3% | 0% | 171 min |
| May | 124 | 82.5% | 0.81% | 141 min |
| June | 120 | 74.2% | 0% | 98 min |
| July | 124 | 79.5% | 0.81% | 97 min |
| August | 124 | 77.7% | 0.81% | 133 min |
| September | 120 | 92.4% | 0% | 104 min |
| October | 124 | 79.8% | 0% | 152 min |
| November | 118 | 84.5% | 1.69% | 141 min |
| December | 124 | 90.3% | 0% | 96 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.