Route
MDW → SFO
Chicago Midway International Airport San Francisco International Airport
1,855 miles
Return route SFO → MDW →
Alerts at MDW and SFO
How punctual is this route?
- On-time arrivals
- 43.4%
- Less than 15 minutes late
- Cancelled
- 1.2%
- Of scheduled flights
- Average delay when late
- 57 min
- Flights arriving 15+ minutes late
- Flights tracked
- 516
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 44%
- Late-arriving aircraft 30%
- Airline (crew, maintenance, cleaning) 23%
- Extreme weather 3%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 80.0% | 30 |
| October 2025 | 56.7% | 31 |
| November 2025 | 72.4% | 30 |
| December 2025 | 54.8% | 31 |
| January 2026 | 71.4% | 14 |
| February 2026 | 84.2% | 19 |
| March 2026 | 56.6% | 56 |
| April 2026 | 23.7% | 60 |
| May 2026 | 19.4% | 62 |
| June 2026 | 28.3% | 60 |
| July 2026 | 45.0% | 61 |
| August 2026 | 25.8% | 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 | 43.4% | 1.2% | 57 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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