Route · MDW → PWM · 2020–2025 BTS data
Chicago to Portland
The MDW–PWM corridor (Chicago, IL → Portland, ME) runs behind the national average, served by 1 carrier across roughly 895 miles.
Data updated 2026-06-13
- 78.8%
- On-time
- -0.2 pts
- vs US avg
- 58 min
- Delay when late
- 660
- Flights
Cancelled
0.8%
Best Month
Jul 2022 75%
Worst Month
Aug 2022 66%
Distance
895 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Oct 2025 | 31 | 1 | 0 | 1 | WN |
| Sep 2025 | 30 | 2 | 0 | 0 | WN |
| Aug 2025 | 31 | 3 | 0 | 0 | WN |
| Jul 2025 | 31 | 6 | 1 | 0 | WN |
| Oct 2024 | 31 | 7 | 0 | 0 | WN |
| Sep 2024 | 30 | 6 | 0 | 1 | WN |
| Aug 2024 | 31 | 5 | 0 | 0 | WN |
| Jul 2024 | 31 | 4 | 0 | 0 | WN |
| Oct 2023 | 31 | 3 | 0 | 0 | WN |
| Sep 2023 | 30 | 5 | 0 | 0 | WN |
| Aug 2023 | 31 | 13 | 0 | 0 | WN |
| Jul 2023 | 31 | 14 | 0 | 0 | WN |
| Oct 2022 | 31 | 6 | 0 | 0 | WN |
| Sep 2022 | 34 | 4 | 0 | 0 | WN |
| Aug 2022 | 58 | 20 | 1 | 0 | WN |
| Jul 2022 | 57 | 14 | 0 | 1 | WN |
| Jun 2022 | 49 | 11 | 2 | 1 | WN |
| Aug 2021 | 31 | 10 | 0 | 0 | WN |
| Jul 2021 | 31 | 6 | 1 | 0 | WN |
Cancellation Rate
0.8%
5 of 660 flights
Diversion Rate
0.6%
4 of 660 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
MDW - Chicago
Full on-time, delay-cause, and seasonal performance for Chicago, IL.
Origin airport →PWM - Portland
Full on-time, delay-cause, and seasonal performance for Portland, ME.
Destination airport →Compare the two airports
See MDW and PWM side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to MDW–PWM.
Routes with a similar on-time rate
What the Data Says About MDW to PWM
660 tracked flights put the MDW to PWM pairing (Chicago to Portland) at a 78.8% on-time rate, squarely in line with the wider network. Delays that do occur run 57.8 minutes on average. Across the 895-mile route and its 1 carrier, the trailing 24 months show 0.8% cancelled and 0.6% diverted (660 flights sampled).
Monthly performance varies moderately here: Jul 2022 was the strongest month at 75% on-time versus Aug 2022 at 66%, a 10-point difference.
Frequently Asked Questions
How often are flights delayed from MDW to PWM? ▼
What is the cancellation rate for MDW to PWM? ▼
How far is the flight from MDW to PWM? ▼
When is the best time to fly from MDW to PWM? ▼
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.