Route
MDW → PDX
Chicago Midway International Airport Portland International Airport
How punctual is this route?
- On-time arrivals
- 58.6%
- Less than 15 minutes late
- Cancelled
- 1.0%
- Of scheduled flights
- Average delay when late
- 55 min
- Flights arriving 15+ minutes late
- Flights tracked
- 674
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 45%
- Airline (crew, maintenance, cleaning) 31%
- Air traffic control & airport 19%
- Extreme weather 4%
- Security 1%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 82.7% | 82 |
| October 2025 | 77.8% | 54 |
| November 2025 | 69.0% | 30 |
| December 2025 | 29.0% | 31 |
| January 2026 | 77.4% | 31 |
| February 2026 | 60.7% | 28 |
| March 2026 | 37.5% | 58 |
| April 2026 | 59.3% | 60 |
| May 2026 | 65.0% | 61 |
| June 2026 | 46.8% | 79 |
| July 2026 | 61.4% | 85 |
| August 2026 | 37.3% | 75 |
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 | 674 | 58.6% | 1.0% | 55 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN2852
57% late · 60 flights
-
WN2039
51% late · 59 flights
-
WN3579
46% late · 58 flights
-
WN2809
19% late · 52 flights
-
WN2497
26% late · 50 flights
-
WN4765
70% late · 43 flights
-
WN3975
50% late · 33 flights
-
WN3976
68% late · 32 flights
-
WN1691
18% late · 28 flights
-
WN4246
57% late · 28 flights
-
WN1766
19% late · 27 flights
-
WN3735
7% late · 27 flights
-
WN3860
15% late · 26 flights
-
WN806
55% late · 20 flights
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