Best Time to Fly IAD to BOS
Washington to Boston — month-by-month delay data from the Bureau of Transportation Statistics.
Best month
January
1% on time
Worst month
January
1% on time
IAD → BOS on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
Monthly breakdown
| Month | On-time | Cancel rate | Flights |
|---|---|---|---|
| January | 1% | 0.1% | 474 |
| February | 1% | 0% | 437 |
| March | 1% | 0% | 485 |
| April | 1% | 0% | 501 |
| May | 1% | 0% | 526 |
| June | 1% | 0% | 504 |
| July | 1% | 0% | 548 |
| August | 1% | 0% | 382 |
| September | 1% | 0% | 382 |
| October | 1% | 0% | 372 |
| November | 1% | 0% | 357 |
| December | 1% | 0% | 370 |
Frequently asked
What is the best month to fly from IAD to BOS?
January has the highest on-time rate at 1% for flights from Washington to Boston.
What is the worst month to fly IAD to BOS?
January has the lowest on-time rate at 1%, often due to winter weather.
How often are IAD to BOS flights delayed?
On average, 1% of flights from IAD to BOS arrive on time. That means about 99% experience some form of delay.
Source: Bureau of Transportation Statistics.