PWM to ORD flight delays
Portland, ME (PWM) Chicago, IL (ORD) · 900 miles
1,486 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
77.18%
Arrived on time
Within 15 minutes of schedule
3.23%
Cancelled
Share of scheduled flights
90 min
When late, late by
Average across delayed arrivals
22 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Which airline you fly changes the odds here. Republic Airways arrived on time 17.2 points more often than SkyWest Airlines over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
The season swings this route hard. In May it ran 29.7 points more punctual than in January — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
Cancellation, not delay, is the risk worth pricing here: 3.23% of scheduled flights never operated. A late flight still gets you there. A cancelled one leaves you rebooking, and on a route with few daily departures that can mean losing a day.
The Portland to Chicago route sits close to the middle of the record — neither notably punctual nor notably late.
Which airline should you fly on this route?
Over January 2025 – August 2026, Republic Airways arrived on time most often on PWM to ORD. SkyWest Airlines was late most often. Flights ran closest to schedule in May and worst in January.
Every airline on PWM to ORD
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Republic Airways | 558 | 82.31% | 3.41% | 83 min | C |
| United Airlines | 428 | 76.56% | 2.1% | 94 min | C |
| SkyWest Airlines | 300 | 65.16% | 4% | 89 min | F |
| Envoy Air | 200 | 82.2% | 4% | 97 min | C |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
ORD to PWM Chicago back to Portland 73.96% on time DOther routes from Portland
Common questions
Are flights from Portland to Chicago usually delayed?
77.18% of flights on the PWM to ORD route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
Which airline is most on time from Portland to Chicago?
Republic Airways, at 82.31% on time across 558 flights. The least punctual on the route was SkyWest Airlines at 65.16%.
How often are PWM to ORD flights cancelled?
3.23% of scheduled flights did not operate — about 32 in every thousand. That is high enough that cancellation, not delay, is the risk worth planning around.
What is the best month to fly Portland to Chicago?
May, when 88.5% of flights arrived on time. The worst was January at 58.8%.
When PWM to ORD flights are late, how late are they?
About 90 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on PWM to ORD during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →