Route Reliability
Chicago → Portland
MDW–PWM · 895 miles · Chicago Midway International Airport to Portland International Jetport
92
Nerd Approved
WanderNerd Reliability Score
- 89%
- Arrive within 15 minutes
- 2 min early
- Average arrival delay
- 0.7%
- Cancelled
- 150
- Flights in the data
Data through May 2026.
Southwest Airlines is the only airline in this data on this route, arriving on time 89% of the time across 150 flights. No comparison to make.
What the data says
The 12–3 PM departure wins.
MDW–PWM flights departing between 12–3 PM arrived on time 96% of the time, versus 86% between 9 AM–12 PM.
Tuesdays have been rough.
MDW–PWM flights arrived on time 100% of the time on Wednesdays and just 81% on Tuesdays. That gap is worth planning around.
Flights on this route
The breakdown
- Mon90%(20 flights)
- Tue81%(21 flights)
- Wed100%(21 flights)
- Thu91%(22 flights)
- Fri82%(22 flights)
- Sat86%(21 flights)
- Sun95%(21 flights)
- 9 AM–12 PM86%(94 flights)
- 12–3 PM96%(46 flights)
- 3–6 PM—(1 flights)
- 6–9 PM—(7 flights)
97%
Oct
Jun 85% → Oct 97% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 85% | 26 |
| July 2025 | 80% | 30 |
| August 2025 | 90% | 31 |
| September 2025 | 93% | 30 |
| October 2025 | 97% | 30 |
Same trip, other airports
Keep nerding
Based on 150 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.