Route on-time record
PDX to ORD: most on-time flights and the best time to fly
Portland (Portland International Airport) to Chicago (Chicago O'Hare International Airport). 2,733 nonstop flights in Jun 2025 to May 2026, 77% arrived within 15 minutes and 1.0% were cancelled. The most reliable flight number was American 2197 at 6:22 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
PDX → ORD
Portland to Chicago: 2,733 nonstop flights a year
On time (12 months)
77%
Cancelled
1.0%
avg delay 17 min
Best time to leave
Before 9 AM
82% on time vs 65% 3 to 6 PM
Most reliable airline
United
80% chance on time
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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 · American 2197
6:22 AM → 12:32 PM4h 10m nonstop
Local times, typical schedule. Last flown 2026-05-20.
91%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 1 min
- Arrived on time 100% of the time (44 flights, Jun 2025 to May 2026).
- Never cancelled in 44 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 82% on time; 3 to 6 PM: 65%).
- Short track record (44 flights), so its score leans on the airline's record at this hour.
Limited track record · 44 flights
Find American 2197 fares Opens this date on Aviasales#2 · American 2933
6:15 AM → 12:31 PM4h 16m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 82% on time; 3 to 6 PM: 65%).
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find American 2933 fares Opens this date on Aviasales#3 · United 2306
7:00 AM → 1:10 PM4h 10m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1496, 2294; its record covers all of them.
85%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.7%
- Avg arrival delay
- 9 min
- Arrived on time 88% of the time (145 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 82% on time; 3 to 6 PM: 65%).
Moderate track record · 145 flights
Find United 2306 fares Opens this date on Aviasales#4 · American 1508
11:59 PM → 5:56 AM3h 57m nonstop
Local times, typical schedule. Last flown 2026-04-06.
84%
chance on time
- On time (history)
- 94%
- Cancelled
- 5.6%
- Avg arrival delay
- 23 min
- Arrived on time 94% of the time (51 flights, Jun 2025 to May 2026).
- Cancelled 5.6% of the time (3 of 54).
- Short track record (51 flights), so its score leans on the airline's record at this hour.
Limited track record · 51 flights
Find American 1508 fares Opens this date on Aviasales#5 · United 1490
11:59 PM → 6:03 AM4h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 2293; its record covers all of them.
84%
chance on time
- On time (history)
- 85%
- Cancelled
- 1.1%
- Avg arrival delay
- 9 min
- Arrived on time 85% of the time (281 flights, Jun 2025 to May 2026).
Strong track record · 281 flights
Find United 1490 fares Opens this date on Aviasales#6 · United 2019
10:55 PM → 5:02 AM4h 07m nonstop
Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as United 1049; its record covers all of them.
84%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 87% of the time (30 flights, Jun 2025 to May 2026).
- Never cancelled in 30 scheduled flights.
- Short track record (30 flights), so its score leans on the airline's record at this hour.
Limited track record · 30 flights
Find United 2019 fares Opens this date on Aviasales#7 · United 2094
10:40 PM → 4:45 AM4h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
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).
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find United 2094 fares Opens this date on Aviasales#8 · American 3099
11:47 PM → 5:49 AM4h 02m nonstop
Local times, typical schedule. Last flown 2026-05-20.
76%
chance on time
- On time (history)
- 77%
- Cancelled
- 0.0%
- Avg arrival delay
- 14 min
- Arrived on time 77% of the time (43 flights, Jun 2025 to May 2026).
- Never cancelled in 44 scheduled flights.
- 73% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (43 flights), so its score leans on the airline's record at this hour.
Limited track record · 43 flights
Find American 3099 fares Opens this date on Aviasales#9 · United 2493
10:45 AM → 4:50 PM4h 05m nonstop
Local times, typical schedule. Last flown 2026-05-20.
75%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.0%
- Avg arrival delay
- 13 min
- Arrived on time 76% of the time (21 flights, Jun 2025 to May 2026).
- Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (21 flights), so its score leans on the airline's record at this hour.
Limited track record · 21 flights
Find United 2493 fares Opens this date on Aviasales#10 · American 2284
11:20 AM → 5:40 PM4h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31.
74%
chance on time
- On time (history)
- 82%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 82% of the time (11 flights, Jun 2025 to May 2026).
- Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find American 2284 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines80%
1,385 flights · 81% on time as flown · 0.7% cancel
- Alaska Airlines74%
518 flights · 74% on time as flown · 1.1% cancel
- American Airlines73%
830 flights · 73% on time as flown · 1.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM82%
936 flights · avg delay 13 min
- 9 AM to noon75%
586 flights · avg delay 22 min
- Noon to 3 PM68%
414 flights · avg delay 18 min
- 3 to 6 PM65%
136 flights · avg delay 22 min
- After 9 PM80%
661 flights · avg delay 17 min
Best day: Tuesday (84%). Worst: Friday (79%).
Smarter routing
Nearby airports that run more on time
PDX → MDW 88% chance on time
Portland International Airport to Chicago Midway International Airport · 686 flights a year · 15 mi from your airports · yours: 77%
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
- Airline (crew, maintenance, boarding)37%
- Air traffic control and airport volume32%
- Late-arriving aircraft29%
- Severe weather1%
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
PDX to ORD questions
- What time of day is best to fly PDX to ORD?
- Before 9 AM: 82% of flights arrived on time, against 65% 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 PDX to ORD?
- United, with a season-adjusted 80% chance of operating and arriving on time over 1,385 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 PDX to ORD?
- July (70% on time); the best was February (90%), 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 PDX
- ORD to PDX (return)
- PDX to SEA 84%
- PDX to LAX 87%
- PDX to DEN 80%
- PDX to PHX 80%
- PDX to SFO 75%
- PDX to LAS 81%
- PDX to DFW 80%
- PDX to SLC 88%
- PDX to SMF 83%
- PDX to SAN 80%
- PDX to SJC 82%
- PDX to ATL 87%
Live status: FAA delays and ground stops