Route
MDW → SEA
Chicago Midway International Airport Seattle–Tacoma International Airport
How punctual is this route?
- On-time arrivals
- 60.0%
- Less than 15 minutes late
- Cancelled
- 0.6%
- Of scheduled flights
- Average delay when late
- 59 min
- Flights arriving 15+ minutes late
- Flights tracked
- 678
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 45%
- Airline (crew, maintenance, cleaning) 26%
- Air traffic control & airport 22%
- Extreme weather 6%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 79.1% | 86 |
| October 2025 | 81.8% | 33 |
| November 2025 | 62.1% | 30 |
| December 2025 | 53.3% | 31 |
| January 2026 | 87.1% | 31 |
| February 2026 | 75.0% | 28 |
| March 2026 | 24.6% | 58 |
| April 2026 | 73.3% | 60 |
| May 2026 | 72.6% | 62 |
| June 2026 | 51.8% | 83 |
| July 2026 | 54.7% | 88 |
| August 2026 | 38.6% | 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 | 60.0% | 0.6% | 59 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN3378
34% late · 58 flights
-
WN3521
19% late · 58 flights
-
WN4144
43% late · 51 flights
-
WN2169
17% late · 47 flights
-
WN2144
39% late · 45 flights
-
WN3640
78% late · 32 flights
-
WN1141
23% late · 31 flights
-
WN2827
36% late · 28 flights
-
WN454
63% late · 28 flights
-
WN1340
52% late · 27 flights
-
WN1401
26% late · 27 flights
-
WN2890
74% late · 27 flights
-
WN2825
79% late · 24 flights
-
WN2826
67% late · 24 flights
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