Route on-time record
ORD to PWM: most on-time flights and the best time to fly
Chicago (Chicago O'Hare International Airport) to Portland (Portland International Jetport). 1,462 nonstop flights in Jun 2025 to May 2026, 74% arrived within 15 minutes and 2.1% were cancelled. The most reliable flight number was Envoy 3474 at 1:59 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
ORD → PWM
Chicago to Portland: 1,462 nonstop flights a year
On time (12 months)
74%
Cancelled
2.1%
avg delay 18 min
Best time to leave
Before 9 AM
89% on time vs 59% 3 to 6 PM
Most reliable airline
Envoy
76% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Envoy 3474 · sold as American Eagle
1:59 PM → 5:31 PM2h 32m nonstop
Local times, typical schedule. Last flown 2026-05-20.
82%
chance on time
- On time (history)
- 86%
- Cancelled
- 1.4%
- Avg arrival delay
- 15 min
- Arrived on time 86% of the time (73 flights, Jun 2025 to May 2026).
- Departs outside ORD's trouble window (2 PM to 8 PM, when 43% of its 237 ground stops and delay programs started).
Moderate track record · 73 flights
Find 1:59 PM flight fares Opens this date on Aviasales#2 · SkyWest 5996 · sold as United Express, Delta Connection, American Eagle or Alaska
7:00 AM → 10:28 AM2h 28m nonstop
Local times, typical schedule. Last flown 2026-05-20.
81%
chance on time
- On time (history)
- 95%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 95% of the time (20 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 59%).
- Departs outside ORD's trouble window (2 PM to 8 PM, when 43% of its 237 ground stops and delay programs started).
Limited track record · 20 flights
Find 7:00 AM flight fares Opens this date on Aviasales#3 · Republic 4774 · sold as American Eagle, Delta Connection or United Express
3:15 PM → 6:49 PM2h 34m nonstop
Local times, typical schedule. Last flown 2026-05-31.
81%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 1 min
- Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 59% on time; Before 9 AM: 89%).
- Departs inside ORD's trouble window: 43% of its 237 ground stops and delay programs started between 2 PM and 8 PM.
Limited track record · 11 flights
Find 3:15 PM flight fares Opens this date on Aviasales#4 · United 2804
10:55 AM → 2:26 PM2h 31m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 min
- Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
- Departs outside ORD's trouble window (2 PM to 8 PM, when 43% of its 237 ground stops and delay programs started).
Limited track record · 11 flights
Find United 2804 fares Opens this date on Aviasales#5 · Republic 4488 · sold as American Eagle, Delta Connection or United Express
8:11 AM → 11:46 AM2h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31.
77%
chance on time
- On time (history)
- 73%
- Cancelled
- 0.0%
- Avg arrival delay
- 36 min
- Arrived on time 73% of the time (11 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 59%).
- Departs outside ORD's trouble window (2 PM to 8 PM, when 43% of its 237 ground stops and delay programs started).
Limited track record · 11 flights
Find 8:11 AM flight fares Opens this date on Aviasales#6 · SkyWest 5767 · sold as United Express, Delta Connection, American Eagle or Alaska
2:02 PM → 5:44 PM2h 42m nonstop
Local times, typical schedule. Last flown 2026-05-31.
74%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
- Departs inside ORD's trouble window: 43% of its 237 ground stops and delay programs started between 2 PM and 8 PM.
Limited track record · 11 flights
Find 2:02 PM flight fares Opens this date on Aviasales#7 · United 2333
10:48 AM → 2:14 PM2h 26m nonstop
Local times, typical schedule. Last flown 2026-05-20.
74%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.0%
- Avg arrival delay
- 20 min
- Arrived on time 76% of the time (21 flights, Jun 2025 to May 2026).
- Departs outside ORD's trouble window (2 PM to 8 PM, when 43% of its 237 ground stops and delay programs started).
Limited track record · 21 flights
Find United 2333 fares Opens this date on Aviasales#8 · Envoy 3336 · sold as American Eagle
7:49 PM → 11:27 PM2h 38m nonstop
Local times, typical schedule. Last flown 2026-05-20.
73%
chance on time
- On time (history)
- 80%
- Cancelled
- 6.8%
- Avg arrival delay
- 9 min
- Arrived on time 80% of the time (41 flights, Jun 2025 to May 2026).
- Cancelled 6.8% of the time (3 of 44).
- Departs inside ORD's trouble window: 43% of its 237 ground stops and delay programs started between 2 PM and 8 PM.
Limited track record · 41 flights
Find 7:49 PM flight fares Opens this date on Aviasales#9 · United 1401
6:18 PM → 9:51 PM2h 33m nonstop
Local times, typical schedule. Last flown 2026-05-31.
66%
chance on time
- On time (history)
- 73%
- Cancelled
- 0.0%
- Avg arrival delay
- 32 min
- Arrived on time 73% of the time (11 flights, Jun 2025 to May 2026).
- Departs inside ORD's trouble window: 43% of its 237 ground stops and delay programs started between 2 PM and 8 PM.
- 71% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 11 flights
Find United 1401 fares Opens this date on Aviasales#10 · Republic 4403 · sold as American Eagle, Delta Connection or United Express
8:54 PM → 12:35 AM2h 41m nonstop
Local times, typical schedule. Last flown 2026-05-31.
60%
chance on time
- On time (history)
- 56%
- Cancelled
- 2.0%
- Avg arrival delay
- 33 min
- Arrived on time 56% of the time (100 flights, Jun 2025 to May 2026).
- Departs outside ORD's trouble window (2 PM to 8 PM, when 43% of its 237 ground stops and delay programs started).
Moderate track record · 100 flights
Find 8:54 PM flight fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Envoy Air (sold as American Eagle)76%
206 flights · 80% on time as flown · 2.9% cancel
- Republic Airways (sold as American Eagle, Delta Connection or United Express)73%
525 flights · 75% on time as flown · 2.1% cancel
- United Airlines71%
429 flights · 73% on time as flown · 1.2% cancel
- SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)68%
302 flights · 70% on time as flown · 2.7% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM89%
184 flights · avg delay 7 min
- 9 AM to noon77%
437 flights · avg delay 16 min
- Noon to 3 PM78%
265 flights · avg delay 15 min
- 3 to 6 PM59%
120 flights · avg delay 31 min
- 6 to 9 PM66%
456 flights · avg delay 24 min
Best day: Tuesday (80%). Worst: Sunday (75%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Late-arriving aircraft42%
- Airline (crew, maintenance, boarding)34%
- Air traffic control and airport volume18%
- Severe weather6%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
ORD to PWM questions
- What time of day is best to fly ORD to PWM?
- Before 9 AM: 89% of flights arrived on time, against 59% for departures 3 to 6 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from ORD to PWM?
- Envoy, with a season-adjusted 76% chance of operating and arriving on time over 206 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on ORD to PWM?
- January (63% on time); the best was February (87%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from ORD
- PWM to ORD (return)
- ORD to LGA 67%
- ORD to BOS 68%
- ORD to LAX 74%
- ORD to DFW 70%
- ORD to DCA 69%
- ORD to MCO 73%
- ORD to ATL 74%
- ORD to MSP 69%
- ORD to DEN 74%
- ORD to IAH 75%
- ORD to EWR 69%
- ORD to DTW 71%
Most on-time flights from ORD on every route →
Live status: FAA delays and ground stops