Route · PWM → ORD · 2020–2025 BTS data
Portland to Chicago
The PWM–ORD corridor (Portland, ME → Chicago, IL) runs ahead of the national average, served by 35 carriers across roughly 900 miles.
Data updated 2026-06-13
- 82.4%
- On-time
- +3.4 pts
- vs US avg
- 87 min
- Delay when late
- 5,860
- Flights
Cancelled
1.6%
Best Month
Apr 2024 92%
Worst Month
Aug 2024 65%
Distance
900 mi
Carriers
35
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 62 | 14 | 1 | 0 | YX,UA,OO |
| Nov 2025 | 91 | 27 | 8 | 0 | OO,UA,YX |
| Oct 2025 | 166 | 48 | 0 | 0 | OO,UA,YX |
| Sep 2025 | 165 | 36 | 2 | 2 | UA,OO,YX |
| Aug 2025 | 177 | 37 | 5 | 1 | OO,YX,UA |
| Jul 2025 | 147 | 45 | 2 | 1 | OO,UA,YX,MQ |
| Jun 2025 | 125 | 32 | 1 | 0 | OO,UA,YX,MQ |
| May 2025 | 114 | 10 | 0 | 0 | OO,UA,MQ |
| Apr 2025 | 80 | 13 | 2 | 0 | OO,UA,YX |
| Mar 2025 | 58 | 9 | 0 | 1 | YX,OO |
| Jan 2025 | 38 | 7 | 0 | 0 | YX,OO |
| Dec 2024 | 61 | 7 | 0 | 0 | OO,UA,YX |
| Nov 2024 | 67 | 9 | 0 | 0 | OO,YX,MQ |
| Oct 2024 | 146 | 24 | 0 | 1 | UA,MQ,OO,YX |
| Sep 2024 | 142 | 22 | 0 | 0 | YX,OO,UA,MQ |
| Aug 2024 | 166 | 58 | 0 | 1 | F9,MQ,YX,UA |
| Jul 2024 | 134 | 25 | 3 | 1 | F9,MQ,UA,YX |
| Jun 2024 | 122 | 25 | 7 | 2 | F9,MQ,UA,YX |
| May 2024 | 69 | 17 | 0 | 0 | F9,YX,OO,UA |
| Apr 2024 | 60 | 5 | 1 | 0 | OO,YX |
| Mar 2024 | 49 | 4 | 3 | 0 | YX,OO |
| Jan 2024 | 31 | 2 | 2 | 0 | YX,OO,UA |
| Dec 2023 | 52 | 8 | 0 | 0 | OO,UA |
| Nov 2023 | 63 | 7 | 0 | 0 | MQ,OO |
Cancellation Rate
1.6%
37 of 2,385 flights
Diversion Rate
0.4%
10 of 2,385 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 →ORD - Chicago
Full on-time, delay-cause, and seasonal performance for Chicago, IL.
Destination airport →Compare the two airports
See PWM and ORD 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–ORD.
Routes with a similar on-time rate
What the Data Says About PWM to ORD
Bureau of Transportation Statistics records show Portland to Chicago (PWM to ORD) running a 82.4% on-time rate over 5,860 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 86.5 minutes. The 900-mile corridor is served by 35 carriers, and over the last 24 months 1.6% of 2,385 flights were cancelled, 0.4% diverted.
The monthly split is wide on this route: Apr 2024 posted the strongest performance at 92% on-time, while Aug 2024 came in at just 65% - a 27-point swing worth factoring into travel timing.
Frequently Asked Questions
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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.