Route
SEA → MDW
Seattle–Tacoma International Airport Chicago Midway International Airport
How punctual is this route?
- On-time arrivals
- 82.9%
- Less than 15 minutes late
- Cancelled
- 0.4%
- Of scheduled flights
- Average delay when late
- 48 min
- Flights arriving 15+ minutes late
- Flights tracked
- 678
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 49%
- Airline (crew, maintenance, cleaning) 36%
- Air traffic control & airport 11%
- Extreme weather 5%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 69.8% | 86 |
| October 2025 | 97.0% | 33 |
| November 2025 | 93.1% | 30 |
| December 2025 | 93.5% | 31 |
| January 2026 | 96.8% | 31 |
| February 2026 | 100.0% | 28 |
| March 2026 | 94.6% | 58 |
| April 2026 | 80.0% | 60 |
| May 2026 | 90.3% | 62 |
| June 2026 | 75.3% | 83 |
| July 2026 | 72.4% | 88 |
| August 2026 | 79.3% | 88 |
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 | 678 | 82.9% | 0.4% | 48 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN2304
35% late · 61 flights
-
WN1807
7% late · 58 flights
-
WN2181
2% late · 58 flights
-
WN3081
43% late · 51 flights
-
WN1100
7% late · 46 flights
-
WN4198
21% late · 39 flights
-
WN2810
3% late · 35 flights
-
WN2123
6% late · 33 flights
-
WN4419
9% late · 32 flights
-
WN1666
16% late · 31 flights
-
WN3534
39% late · 28 flights
-
WN2333
4% late · 23 flights
-
WN2447
26% late · 23 flights
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