Route
SJC → MDW
Mineta San Jose International Airport Chicago Midway International Airport
How punctual is this route?
- On-time arrivals
- 84.6%
- Less than 15 minutes late
- Cancelled
- 0.2%
- Of scheduled flights
- Average delay when late
- 40 min
- Flights arriving 15+ minutes late
- Flights tracked
- 526
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 44%
- Airline (crew, maintenance, cleaning) 41%
- Air traffic control & airport 13%
- Extreme weather 1%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 86.5% | 52 |
| October 2025 | 93.8% | 32 |
| November 2025 | 93.1% | 30 |
| December 2025 | 96.8% | 31 |
| January 2026 | 78.6% | 14 |
| February 2026 | 100.0% | 19 |
| March 2026 | 88.2% | 52 |
| April 2026 | 85.7% | 56 |
| May 2026 | 67.9% | 57 |
| June 2026 | 81.0% | 60 |
| July 2026 | 80.3% | 61 |
| August 2026 | 83.3% | 62 |
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 | 526 | 84.6% | 0.2% | 40 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN3730
5% late · 63 flights
-
WN4252
9% late · 58 flights
-
WN3886
6% late · 52 flights
-
WN4357
36% late · 52 flights
-
WN1877
51% late · 42 flights
-
WN4447
0% late · 32 flights
-
WN3401
6% late · 31 flights
-
WN3803
10% late · 31 flights
-
WN2077
10% late · 30 flights
-
WN3607
25% late · 28 flights
-
WN2546
17% late · 23 flights
-
WN3720
22% late · 23 flights
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