Route · MDW → SAN · 2020–2025 BTS data
Chicago to San Diego
The MDW–SAN corridor (Chicago, IL → San Diego, CA) runs behind the national average, served by 1 carrier across roughly 1,728 miles.
Data updated 2026-06-13
- 77.7%
- On-time
- -1.3 pts
- vs US avg
- 54 min
- Delay when late
- 6,395
- Flights
Cancelled
0.9%
Best Month
Aug 2024 86%
Worst Month
Jun 2024 65%
Distance
1,728 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 91 | 28 | 0 | 0 | WN |
| Nov 2025 | 86 | 19 | 3 | 0 | WN |
| Oct 2025 | 89 | 13 | 0 | 2 | WN |
| Sep 2025 | 86 | 21 | 0 | 1 | WN |
| Aug 2025 | 88 | 18 | 2 | 0 | WN |
| Jul 2025 | 93 | 24 | 1 | 0 | WN |
| Jun 2025 | 90 | 28 | 0 | 1 | WN |
| May 2025 | 86 | 20 | 0 | 0 | WN |
| Apr 2025 | 87 | 18 | 0 | 0 | WN |
| Mar 2025 | 88 | 16 | 0 | 0 | WN |
| Feb 2025 | 56 | 10 | 0 | 0 | WN |
| Jan 2025 | 64 | 12 | 0 | 1 | WN |
| Dec 2024 | 69 | 15 | 2 | 4 | WN |
| Nov 2024 | 75 | 13 | 1 | 0 | WN |
| Oct 2024 | 85 | 14 | 0 | 1 | WN |
| Sep 2024 | 103 | 18 | 0 | 0 | WN |
| Aug 2024 | 111 | 16 | 1 | 0 | WN |
| Jul 2024 | 104 | 33 | 1 | 1 | WN |
| Jun 2024 | 100 | 35 | 0 | 3 | WN |
| May 2024 | 78 | 25 | 1 | 1 | WN |
| Apr 2024 | 80 | 24 | 1 | 0 | WN |
| Mar 2024 | 89 | 23 | 0 | 0 | WN |
| Feb 2024 | 71 | 13 | 0 | 0 | WN |
| Jan 2024 | 78 | 13 | 5 | 0 | WN |
Cancellation Rate
0.9%
18 of 2,047 flights
Diversion Rate
0.7%
15 of 2,047 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
MDW - Chicago
Full on-time, delay-cause, and seasonal performance for Chicago, IL.
Origin airport →SAN - San Diego
Full on-time, delay-cause, and seasonal performance for San Diego, CA.
Destination airport →Compare the two airports
See MDW and SAN side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to MDW–SAN.
Routes with a similar on-time rate
What the Data Says About MDW to SAN
The Chicago to San Diego corridor (MDW to SAN) posts a 77.7% on-time rate on the lower edge of the average band, based on 6,395 tracked flights. Late flights run 53.9 minutes behind on average. 1 carrier cover the 1,728-mile route; over the last 24 months, 18 of 2,047 flights were cancelled (0.9%) and 0.7% diverted.
The monthly split is wide on this route: Aug 2024 posted the strongest performance at 86% on-time, while Jun 2024 came in at just 65% - a 21-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from MDW to SAN? ▼
What is the cancellation rate for MDW to SAN? ▼
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Flight Guides
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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.