Route
SAN → MDW
San Diego International Airport Chicago Midway International Airport
Alerts at SAN and MDW
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Read the story →
Watch Ground Delay Program SAN
Ground Delay Program at San Diego International Airport (SAN): Average 37 minutes, up to 1 hour and 11 minutes
Reason: airport volume
Airport status
How punctual is this route?
- On-time arrivals
- 76.7%
- Less than 15 minutes late
- Cancelled
- 1.1%
- Of scheduled flights
- Average delay when late
- 54 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,110
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 49%
- Airline (crew, maintenance, cleaning) 34%
- Air traffic control & airport 15%
- Extreme weather 1%
- Security 1%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 73.3% | 86 |
| October 2025 | 87.6% | 89 |
| November 2025 | 85.2% | 86 |
| December 2025 | 75.8% | 91 |
| January 2026 | 79.1% | 67 |
| February 2026 | 83.3% | 66 |
| March 2026 | 80.6% | 102 |
| April 2026 | 79.4% | 103 |
| May 2026 | 76.2% | 105 |
| June 2026 | 80.2% | 103 |
| July 2026 | 66.0% | 106 |
| August 2026 | 59.6% | 106 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Southwest Airlines | 1,110 | 76.7% | 1.1% | 54 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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WN3513
20% late · 60 flights
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WN4602
27% late · 60 flights
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WN4025
29% late · 58 flights
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WN4094
2% late · 58 flights
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WN3292
16% late · 57 flights
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WN1209
9% late · 47 flights
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WN3683
22% late · 46 flights
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WN3768
16% late · 46 flights
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WN4163
49% late · 43 flights
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WN1934
21% late · 42 flights
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WN3448
53% late · 36 flights
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WN990
6% late · 32 flights
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WN3752
0% late · 31 flights
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WN2709
8% late · 28 flights
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WN3431
4% late · 28 flights
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WN202
7% late · 27 flights
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WN257
15% late · 27 flights
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WN2712
74% late · 24 flights
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WN4363
36% late · 23 flights
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WN3910
30% late · 20 flights
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