Route
SFO → MDW
San Francisco International Airport Chicago Midway International Airport
Alerts at SFO and MDW
How punctual is this route?
- On-time arrivals
- 73.5%
- Less than 15 minutes late
- Cancelled
- 1.2%
- Of scheduled flights
- Average delay when late
- 47 min
- Flights arriving 15+ minutes late
- Flights tracked
- 516
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 67%
- Air traffic control & airport 16%
- Airline (crew, maintenance, cleaning) 15%
- Security 1%
- Extreme weather 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 66.7% | 30 |
| October 2025 | 90.3% | 31 |
| November 2025 | 86.2% | 30 |
| December 2025 | 83.9% | 31 |
| January 2026 | 64.3% | 14 |
| February 2026 | 89.5% | 19 |
| March 2026 | 84.6% | 56 |
| April 2026 | 72.4% | 60 |
| May 2026 | 62.9% | 62 |
| June 2026 | 61.7% | 60 |
| July 2026 | 61.0% | 61 |
| August 2026 | 80.3% | 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 | 516 | 73.5% | 1.2% | 47 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN3649
63% late · 61 flights
-
WN2318
9% late · 58 flights
-
WN4216
55% late · 58 flights
-
WN1779
18% late · 44 flights
-
WN3938
21% late · 33 flights
-
WN1945
20% late · 32 flights
-
WN2301
32% late · 31 flights
-
WN2080
20% late · 30 flights
-
WN3443
11% late · 28 flights
-
WN3556
18% late · 28 flights
-
WN3834
8% late · 25 flights
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