Route · PWM → MDW · 2020–2025 BTS data
Portland to Chicago
The PWM–MDW corridor (Portland, ME → Chicago, IL) runs behind the national average, served by 1 carrier across roughly 895 miles.
Data updated 2026-06-13
- 70.9%
- On-time
- -8.1 pts
- vs US avg
- 67 min
- Delay when late
- 660
- Flights
Cancelled
1.7%
Best Month
Aug 2022 71%
Worst Month
Jul 2022 54%
Distance
895 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Oct 2025 | 31 | 2 | 0 | 0 | WN |
| Sep 2025 | 30 | 2 | 0 | 0 | WN |
| Aug 2025 | 31 | 5 | 0 | 1 | WN |
| Jul 2025 | 31 | 16 | 3 | 0 | WN |
| Oct 2024 | 31 | 2 | 0 | 0 | WN |
| Sep 2024 | 30 | 3 | 0 | 0 | WN |
| Aug 2024 | 31 | 13 | 0 | 0 | WN |
| Jul 2024 | 31 | 7 | 0 | 0 | WN |
| Oct 2023 | 31 | 6 | 0 | 0 | WN |
| Sep 2023 | 30 | 8 | 0 | 0 | WN |
| Aug 2023 | 31 | 16 | 0 | 0 | WN |
| Jul 2023 | 31 | 17 | 0 | 0 | WN |
| Oct 2022 | 31 | 10 | 0 | 0 | WN |
| Sep 2022 | 34 | 5 | 0 | 0 | WN |
| Aug 2022 | 58 | 17 | 3 | 1 | WN |
| Jul 2022 | 57 | 26 | 0 | 0 | WN |
| Jun 2022 | 49 | 16 | 2 | 0 | WN |
| Aug 2021 | 31 | 12 | 2 | 0 | WN |
| Jul 2021 | 31 | 9 | 1 | 0 | WN |
Cancellation Rate
1.7%
11 of 660 flights
Diversion Rate
0.3%
2 of 660 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
PWM - Portland
Full on-time, delay-cause, and seasonal performance for Portland, ME.
Origin airport →MDW - Chicago
Full on-time, delay-cause, and seasonal performance for Chicago, IL.
Destination airport →Compare the two airports
See PWM and MDW side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to PWM–MDW.
Routes with a similar on-time rate
What the Data Says About PWM to MDW
On-time performance on the PWM to MDW pairing (Portland to Chicago) trails a chunk of the network: 70.9% of 660 tracked flights arrived on schedule, with a 67.2-minute average delay on the ones that ran late. The route spans about 895 miles across 1 carrier. Cancellations over the trailing 24 months hit 1.7% (11 of 660 flights), with 0.3% diverted.
The monthly split is wide on this route: Aug 2022 posted the strongest performance at 71% on-time, while Jul 2022 came in at just 54% - a 16-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from PWM to MDW? ▼
What is the cancellation rate for PWM to MDW? ▼
How far is the flight from PWM to MDW? ▼
When is the best time to fly from PWM to MDW? ▼
Flight Guides
Tips and data-driven advice for choosing reliable routes.
Explore PlainFlights
Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.