Route · IAD → MDW · 2020–2025 BTS data
Washington to Chicago
The IAD–MDW corridor (Washington, DC → Chicago, IL) runs ahead of the national average, served by 1 carrier across roughly 577 miles.
Data updated 2026-06-13
- 84.6%
- On-time
- +5.6 pts
- vs US avg
- 60 min
- Delay when late
- 2,672
- Flights
Cancelled
2.5%
Best Month
Feb 2023 94%
Worst Month
Aug 2022 70%
Distance
577 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2023 | 59 | 4 | 2 | 1 | WN |
| Nov 2023 | 59 | 6 | 0 | 0 | WN |
| Oct 2023 | 78 | 8 | 0 | 0 | WN |
| Sep 2023 | 69 | 11 | 1 | 0 | WN |
| Aug 2023 | 83 | 15 | 0 | 0 | WN |
| Jul 2023 | 78 | 20 | 0 | 1 | WN |
| Jun 2023 | 78 | 18 | 0 | 0 | WN |
| May 2023 | 81 | 9 | 0 | 0 | WN |
| Apr 2023 | 75 | 18 | 0 | 0 | WN |
| Mar 2023 | 81 | 11 | 0 | 0 | WN |
| Feb 2023 | 72 | 4 | 4 | 0 | WN |
| Jan 2023 | 80 | 8 | 7 | 0 | WN |
| Dec 2022 | 79 | 13 | 14 | 0 | WN |
| Nov 2022 | 81 | 5 | 0 | 0 | WN |
| Oct 2022 | 88 | 13 | 2 | 0 | WN |
| Sep 2022 | 85 | 16 | 0 | 0 | WN |
| Aug 2022 | 89 | 27 | 3 | 0 | WN |
| Jul 2022 | 88 | 24 | 0 | 0 | WN |
| Jun 2022 | 86 | 24 | 1 | 0 | WN |
| May 2022 | 89 | 11 | 0 | 0 | WN |
| Apr 2022 | 84 | 11 | 0 | 0 | WN |
| Mar 2022 | 85 | 15 | 1 | 0 | WN |
| Feb 2022 | 76 | 5 | 6 | 0 | WN |
| Jan 2022 | 81 | 8 | 7 | 0 | WN |
Cancellation Rate
2.5%
48 of 1,904 flights
Diversion Rate
0.1%
2 of 1,904 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
IAD - Washington
Full on-time, delay-cause, and seasonal performance for Washington, DC.
Origin airport →MDW - Chicago
Full on-time, delay-cause, and seasonal performance for Chicago, IL.
Destination airport →Compare the two airports
See IAD and MDW side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to IAD–MDW.
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What the Data Says About IAD to MDW
Bureau of Transportation Statistics records show Washington to Chicago (IAD to MDW) running a 84.6% on-time rate over 2,672 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 59.6 minutes. The 577-mile corridor is served by 1 carrier, and over the last 24 months 2.5% of 1,904 flights were cancelled, 0.1% diverted.
The monthly split is wide on this route: Feb 2023 posted the strongest performance at 94% on-time, while Aug 2022 came in at just 70% - a 25-point swing worth factoring into travel timing.
Frequently Asked Questions
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Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.