Route
BUF → MDW
Buffalo Niagara International Airport Chicago Midway International Airport
How punctual is this route?
- On-time arrivals
- 75.2%
- Less than 15 minutes late
- Cancelled
- 1.6%
- Of scheduled flights
- Average delay when late
- 63 min
- Flights arriving 15+ minutes late
- Flights tracked
- 829
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 52%
- Air traffic control & airport 28%
- Airline (crew, maintenance, cleaning) 19%
- Extreme weather 1%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 89.0% | 82 |
| October 2025 | 84.7% | 59 |
| November 2025 | 84.9% | 56 |
| December 2025 | 71.2% | 60 |
| January 2026 | 90.0% | 30 |
| February 2026 | 86.7% | 30 |
| March 2026 | 58.1% | 77 |
| April 2026 | 80.2% | 82 |
| May 2026 | 74.4% | 82 |
| June 2026 | 75.0% | 90 |
| July 2026 | 66.3% | 92 |
| August 2026 | 62.8% | 89 |
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 | 829 | 75.2% | 1.6% | 63 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN766
37% late · 67 flights
-
WN768
46% late · 56 flights
-
WN724
8% late · 53 flights
-
WN2345
10% late · 42 flights
-
WN4504
24% late · 42 flights
-
WN1468
6% late · 31 flights
-
WN3314
13% late · 31 flights
-
WN3709
62% late · 28 flights
-
WN4154
0% late · 26 flights
-
WN1624
25% late · 24 flights
-
WN4020
46% late · 24 flights
-
WN935
12% late · 24 flights
-
WN1303
13% late · 23 flights
-
WN3853
75% late · 20 flights
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