Airports › Chicago (MDW) › September 2025
Airport month · September 2025
Chicago Midway International in September 2025
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.
In September 2025, reporting carriers scheduled 6,459 domestic departures from Chicago Midway International (MDW). 81.8% left less than 15 minutes late and 83.8% reached their destination on time; 0.1% were cancelled.
Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so MDW departures were 1.3 points below the national departure figure.
A year earlier, in September 2024, the airport had 6,849 departures with 83.0% leaving on time: a change of −1.2 points, with flights down 6%.
Flights arriving at MDW that month were on time 85.5% of the time (6,462 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 37%, late-arriving aircraft 34% and national aviation system 26%.
- On time 83.8%
- Arrived 15+ minutes late 15.9%
- Cancelled 0.1%
- Diverted 0.2%
September 2025 against a year earlier, the airport's year and the nation
| Measure | Sep 2025 | Sep 2024 | MDW, 12 months to Jul 2026 | All reported flights, Sep 2025 |
|---|---|---|---|---|
| Departed on time | 81.8% | 83.0% | 70.7% | 83.1% |
| Arrived on time | 83.8% | 84.7% | 73.9% | 82.8% |
| Cancelled | 0.1% | 0.3% | 1.5% | 0.5% |
| Average departure delay (late minutes only) | 9.7 min | 8.5 min | 16.5 min | 12.2 min |
| Scheduled departures a day | 215 | 228 | 202 | 18,748 |
| Scheduled departures | 6,459 | 6,849 | 73,744 | 562,439 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| WN Southwest Airlines | 6,007 | 93% | 83.5% | 1.6 min | 0.1% |
| F9 Frontier Airlines | 174 | 3% | 84.5% | -0.9 min | 0.0% |
| OO SkyWest Airlines | 151 | 2% | 88.7% | -5.4 min | 0.0% |
| DL Delta Air Lines | 107 | 2% | 93.5% | -12.3 min | 0.0% |
| G4 Allegiant Air | 20 | 0% | 75.0% | 11.1 min | 0.0% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| MDW–ATL | Chicago to Atlanta | 292 | 87.7% | -4.4 min | 0.0% |
| MDW–MSP | Chicago to Minneapolis | 232 | 80.6% | -0.5 min | 0.0% |
| MDW–LAS | Chicago to Las Vegas | 213 | 82.2% | 1.3 min | 0.0% |
| MDW–MCO | Chicago to Orlando | 213 | 86.4% | 0.9 min | 0.0% |
| MDW–PHX | Chicago to Phoenix | 205 | 88.3% | -1.2 min | 1.0% |
| MDW–DEN | Chicago to Denver | 202 | 85.1% | 0.4 min | 0.0% |
| MDW–LGA | Chicago to New York | 198 | 78.3% | 4.1 min | 1.0% |
| MDW–DAL | Chicago to Dallas | 190 | 79.5% | 4.0 min | 0.0% |
| MDW–BWI | Chicago to Baltimore | 180 | 85.6% | 2.9 min | 0.0% |
| MDW–MCI | Chicago to Kansas City | 177 | 85.3% | -0.1 min | 0.0% |
| MDW–DCA | Chicago to Washington | 176 | 78.4% | 4.1 min | 0.0% |
| MDW–HOU | Chicago to Houston | 161 | 89.4% | -1.0 min | 0.0% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left MDW on time in September 2025?
81.8% of 6,459 scheduled domestic departures left less than 15 minutes late, and 83.8% reached their destination on time. The national figures that month were 83.1% and 82.8%.
How does that compare with a year earlier?
In September 2024, 83.0% of 6,849 departures left on time and 0.3% were cancelled, against 81.8% and 0.1% in September 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for MDW · methodology · corrections.