Route · SAN → MDW · 2020–2025 BTS data
San Diego to Chicago
The SAN–MDW corridor (San Diego, CA → Chicago, IL) runs ahead of the national average, served by 1 carrier across roughly 1,728 miles.
Data updated 2026-06-13
- 80.9%
- On-time
- +1.9 pts
- vs US avg
- 55 min
- Delay when late
- 6,353
- Flights
Cancelled
0.7%
Best Month
Oct 2025 88%
Worst Month
Jul 2024 63%
Distance
1,728 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 91 | 22 | 0 | 0 | WN |
| Nov 2025 | 86 | 12 | 3 | 2 | WN |
| Oct 2025 | 89 | 11 | 0 | 0 | WN |
| Sep 2025 | 86 | 23 | 0 | 0 | WN |
| Aug 2025 | 89 | 28 | 0 | 1 | WN |
| Jul 2025 | 93 | 27 | 1 | 1 | WN |
| Jun 2025 | 90 | 29 | 1 | 0 | WN |
| May 2025 | 86 | 17 | 0 | 1 | WN |
| Apr 2025 | 87 | 12 | 0 | 0 | WN |
| Mar 2025 | 88 | 12 | 0 | 0 | WN |
| Feb 2025 | 50 | 15 | 0 | 0 | WN |
| Jan 2025 | 64 | 10 | 0 | 0 | WN |
| Dec 2024 | 69 | 16 | 3 | 1 | WN |
| Nov 2024 | 75 | 11 | 0 | 0 | WN |
| Oct 2024 | 85 | 20 | 1 | 0 | WN |
| Sep 2024 | 103 | 23 | 0 | 0 | WN |
| Aug 2024 | 112 | 26 | 0 | 0 | WN |
| Jul 2024 | 104 | 38 | 0 | 2 | WN |
| Jun 2024 | 100 | 36 | 0 | 1 | WN |
| May 2024 | 87 | 22 | 0 | 1 | WN |
| Apr 2024 | 86 | 18 | 0 | 0 | WN |
| Mar 2024 | 83 | 17 | 1 | 0 | WN |
| Feb 2024 | 63 | 11 | 0 | 0 | WN |
| Jan 2024 | 72 | 15 | 4 | 0 | WN |
Cancellation Rate
0.7%
14 of 2,038 flights
Diversion Rate
0.5%
10 of 2,038 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SAN - San Diego
Full on-time, delay-cause, and seasonal performance for San Diego, CA.
Origin airport →MDW - Chicago
Full on-time, delay-cause, and seasonal performance for Chicago, IL.
Destination airport →Compare the two airports
See SAN 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 SAN–MDW.
Routes with a similar on-time rate
What the Data Says About SAN to MDW
6,353 tracked flights put the SAN to MDW pairing (San Diego to Chicago) at a 80.9% on-time rate, squarely in line with the wider network. Delays that do occur run 55.1 minutes on average. Across the 1,728-mile route and its 1 carrier, the trailing 24 months show 0.7% cancelled and 0.5% diverted (2,038 flights sampled).
The monthly split is wide on this route: Oct 2025 posted the strongest performance at 88% on-time, while Jul 2024 came in at just 63% - a 24-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.