Best Time to Fly IAD to PHL
Washington to Philadelphia — month-by-month delay data from the Bureau of Transportation Statistics.
Best month
May
1% on time
Worst month
May
1% on time
IAD → PHL on-time performance by month
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
Monthly breakdown
| Month | On-time | Cancel rate | Flights |
|---|---|---|---|
| May | 1% | 0% | 15 |
| June | 1% | 0.1% | 35 |
| July | 1% | 0% | 57 |
| October | 1% | 0% | 17 |
| November | 1% | 0.1% | 50 |
| December | 1% | 0% | 28 |
Frequently asked
What is the best month to fly from IAD to PHL?
May has the highest on-time rate at 1% for flights from Washington to Philadelphia.
What is the worst month to fly IAD to PHL?
May has the lowest on-time rate at 1%, often due to seasonal weather patterns.
How often are IAD to PHL flights delayed?
On average, 1% of flights from IAD to PHL arrive on time. That means about 99% experience some form of delay.
Source: Bureau of Transportation Statistics.