Best Time to Fly IAD to PWM
Washington to Portland — month-by-month delay data from the Bureau of Transportation Statistics.
Best month
January
1% on time
Worst month
January
1% on time
IAD → PWM on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
Monthly breakdown
| Month | On-time | Cancel rate | Flights |
|---|---|---|---|
| January | 1% | 0.1% | 114 |
| February | 1% | 0% | 100 |
| March | 1% | 0% | 31 |
| April | 1% | 0% | 56 |
| May | 1% | 0% | 342 |
| June | 1% | 0% | 405 |
| July | 1% | 0% | 382 |
| August | 1% | 0% | 294 |
| September | 1% | 0% | 242 |
| October | 1% | 0% | 218 |
| November | 1% | 0% | 133 |
| December | 1% | 0% | 120 |
Frequently asked
What is the best month to fly from IAD to PWM?
January has the highest on-time rate at 1% for flights from Washington to Portland.
What is the worst month to fly IAD to PWM?
January has the lowest on-time rate at 1%, often due to winter weather.
How often are IAD to PWM flights delayed?
On average, 1% of flights from IAD to PWM arrive on time. That means about 99% experience some form of delay.
Source: Bureau of Transportation Statistics.