Route · ORD → PWM · 2020–2025 BTS data
Chicago to Portland
The ORD–PWM corridor (Chicago, IL → Portland, ME) runs ahead of the national average, served by 35 carriers across roughly 900 miles.
Data updated 2026-06-13
- 80.8%
- On-time
- +1.8 pts
- vs US avg
- 70 min
- Delay when late
- 5,757
- Flights
Cancelled
1.3%
Best Month
Sep 2024 95%
Worst Month
Dec 2025 61%
Distance
900 mi
Carriers
35
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 62 | 24 | 1 | 0 | YX,UA,OO |
| Nov 2025 | 90 | 23 | 5 | 0 | OO,UA,YX |
| Oct 2025 | 166 | 41 | 0 | 0 | OO,UA,YX |
| Sep 2025 | 165 | 34 | 0 | 0 | UA,OO,YX |
| Aug 2025 | 177 | 46 | 5 | 0 | OO,YX,UA |
| Jul 2025 | 147 | 49 | 2 | 0 | OO,UA,YX,MQ |
| Jun 2025 | 126 | 30 | 0 | 1 | OO,UA,YX,MQ |
| May 2025 | 114 | 9 | 0 | 0 | OO,UA,MQ |
| Apr 2025 | 80 | 7 | 1 | 0 | OO,UA,YX |
| Mar 2025 | 59 | 11 | 0 | 1 | YX,OO |
| Jan 2025 | 37 | 16 | 0 | 0 | YX,OO |
| Dec 2024 | 61 | 10 | 0 | 1 | OO,UA,YX |
| Nov 2024 | 66 | 8 | 0 | 0 | OO,YX,MQ |
| Oct 2024 | 147 | 18 | 0 | 0 | UA,MQ,OO,YX |
| Sep 2024 | 141 | 7 | 0 | 1 | YX,OO,UA,MQ |
| Aug 2024 | 166 | 39 | 0 | 0 | F9,MQ,YX,UA |
| Jul 2024 | 134 | 38 | 3 | 0 | F9,MQ,UA,YX |
| Jun 2024 | 123 | 28 | 5 | 0 | F9,MQ,UA,YX |
| May 2024 | 69 | 11 | 1 | 1 | F9,YX,OO,UA |
| Apr 2024 | 60 | 10 | 1 | 1 | OO,YX |
| Mar 2024 | 50 | 10 | 3 | 0 | YX,OO |
| Jan 2024 | 31 | 7 | 4 | 0 | YX,OO,UA |
| Dec 2023 | 51 | 19 | 0 | 0 | OO,UA |
| Nov 2023 | 63 | 15 | 0 | 0 | MQ,OO |
Cancellation Rate
1.3%
31 of 2,385 flights
Diversion Rate
0.3%
6 of 2,385 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
ORD - 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 ORD 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 ORD–PWM.
Routes with a similar on-time rate
What the Data Says About ORD to PWM
5,757 tracked flights put the ORD to PWM pairing (Chicago to Portland) at a 80.8% on-time rate, squarely in line with the wider network. Delays that do occur run 69.7 minutes on average. Across the 900-mile route and its 35 carriers, the trailing 24 months show 1.3% cancelled and 0.3% diverted (2,385 flights sampled).
The monthly split is wide on this route: Sep 2024 posted the strongest performance at 95% on-time, while Dec 2025 came in at just 61% - a 34-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from ORD to PWM? ▼
What is the cancellation rate for ORD to PWM? ▼
How far is the flight from ORD to PWM? ▼
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Flight Guides
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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.