Route · MDW → PWM · 2020–2025 BTS data
Chicago to Portland
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), MDW to PWM (Chicago to Portland) ranks #4758 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 78.8%
- On-time
- -0.2 pts
- vs US avg
- 58 min
- Delay when late
- 660
- Flights
- #4758 of 4927
- Corpus placement
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.
MDW on-time profilePWM - Portland
Full on-time, delay-cause, and seasonal performance for Portland, ME.
PWM on-time profileCompare the two airports
See MDW and PWM side by side on delays, cancellations, and reliability.
Compare MDW vs PWMOrigin-hub reliability standing
Mid-pack among MDW departures
From MDW, this corridor sits with 51 other 75–85% on-time routes out of 69 tracked departures, not the hub's reliability leaders (0 at ≥85%) and not the softest ( 18 below 75%). Destination: Portland · fleet on-time rank #3585 of 4927.
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.
On the multi-year calendar, MDW–PWM peaks in September at 86.3% on-time while June carries the heaviest traffic (~49 flights per month) ; the softest month is August at 72.0%, a 14.3-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does MDW to PWM rank among US routes by traffic? ▼
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? ▼
Airports on this route
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.
Using MDW–PWM data
MDW–PWM is mid-pack at 78.8% on-time; month and carrier mix move more than the corridor headline.
- Compare MDW and PWM airport profiles: delay causes and top routes differ even on the same corridor. MDW airport
- If your dates flex, September (86.3% on-time) beats August (72.0%) on this corridor. Seasonal chart
- 4 other routes post a similar 78.8% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
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.