Best Time to Fly IAD to ORD
Washington to Chicago — month-by-month delay data from the Bureau of Transportation Statistics.
Best month
January
1% on time
Worst month
January
1% on time
IAD → ORD on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
Monthly breakdown
| Month | On-time | Cancel rate | Flights |
|---|---|---|---|
| January | 1% | 0% | 500 |
| February | 1% | 0% | 454 |
| March | 1% | 0% | 551 |
| April | 1% | 0% | 605 |
| May | 1% | 0% | 714 |
| June | 1% | 0% | 690 |
| July | 1% | 0% | 705 |
| August | 1% | 0% | 512 |
| September | 1% | 0% | 514 |
| October | 1% | 0% | 491 |
| November | 1% | 0% | 421 |
| December | 1% | 0% | 397 |
Frequently asked
What is the best month to fly from IAD to ORD?
January has the highest on-time rate at 1% for flights from Washington to Chicago.
What is the worst month to fly IAD to ORD?
January has the lowest on-time rate at 1%, often due to winter weather.
How often are IAD to ORD flights delayed?
On average, 1% of flights from IAD to ORD arrive on time. That means about 99% experience some form of delay.
Source: Bureau of Transportation Statistics.