Route · BOS → MDW · 2020–2025 BTS data
Boston to Chicago
The BOS–MDW corridor (Boston, MA → Chicago, IL) runs ahead of the national average, served by 1 carrier across roughly 861 miles.
Data updated 2026-06-13
- 82.1%
- On-time
- +3.1 pts
- vs US avg
- 66 min
- Delay when late
- 7,232
- Flights
Cancelled
1.1%
Best Month
Mar 2025 94%
Worst Month
Sep 2025 58%
Distance
861 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 90 | 26 | 0 | 0 | WN |
| Nov 2025 | 88 | 15 | 4 | 1 | WN |
| Oct 2025 | 139 | 40 | 1 | 0 | WN |
| Sep 2025 | 128 | 54 | 2 | 0 | WN |
| Aug 2025 | 135 | 26 | 2 | 0 | WN |
| Jul 2025 | 172 | 49 | 2 | 0 | WN |
| Jun 2025 | 157 | 49 | 0 | 0 | WN |
| May 2025 | 101 | 32 | 0 | 0 | WN |
| Apr 2025 | 90 | 12 | 0 | 0 | WN |
| Mar 2025 | 67 | 4 | 1 | 0 | WN |
| Feb 2025 | 66 | 14 | 0 | 0 | WN |
| Jan 2025 | 71 | 11 | 1 | 0 | WN |
| Dec 2024 | 91 | 24 | 3 | 0 | WN |
| Nov 2024 | 89 | 13 | 0 | 0 | WN |
| Oct 2024 | 140 | 21 | 0 | 0 | WN |
| Sep 2024 | 136 | 14 | 0 | 0 | WN |
| Aug 2024 | 144 | 30 | 2 | 1 | WN |
| Jul 2024 | 170 | 49 | 1 | 2 | WN |
| Jun 2024 | 161 | 52 | 1 | 1 | WN |
| May 2024 | 111 | 36 | 0 | 0 | WN |
| Apr 2024 | 105 | 20 | 0 | 0 | WN |
| Mar 2024 | 97 | 11 | 0 | 0 | WN |
| Feb 2024 | 75 | 9 | 1 | 0 | WN |
| Jan 2024 | 83 | 18 | 8 | 1 | WN |
Cancellation Rate
1.1%
29 of 2,706 flights
Diversion Rate
0.2%
6 of 2,706 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
BOS - Boston
Full on-time, delay-cause, and seasonal performance for Boston, MA.
Origin airport →MDW - Chicago
Full on-time, delay-cause, and seasonal performance for Chicago, IL.
Destination airport →Compare the two airports
See BOS 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 BOS–MDW.
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What the Data Says About BOS to MDW
Bureau of Transportation Statistics records show Boston to Chicago (BOS to MDW) running a 82.1% on-time rate over 7,232 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 66.3 minutes. The 861-mile corridor is served by 1 carrier, and over the last 24 months 1.1% of 2,706 flights were cancelled, 0.2% diverted.
The monthly split is wide on this route: Mar 2025 posted the strongest performance at 94% on-time, while Sep 2025 came in at just 58% - a 36-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.