Route on-time record

ORD to PDX: most on-time flights and the best time to fly

Chicago (Chicago O'Hare International Airport) to Portland (Portland International Airport). 2,730 nonstop flights in Jun 2025 to May 2026, 71% arrived within 15 minutes and 0.8% were cancelled. The most reliable flight number was United 1994 at 9:10 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

ORD → PDX

Chicago to Portland: 2,730 nonstop flights a year

On time (12 months)

71%

Cancelled

0.8%

avg delay 19 min

Best time to leave

Before 9 AM

84% on time vs 47% after 9 PM

Most reliable airline

United

73% chance on time

Check ORD to PDX fares

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 · United 1994
9:10 AM → 11:46 AM4h 37m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
On time (history)
84%
Cancelled
0.0%
Avg arrival delay
10 min
- Arrived on time 84% of the time (311 flights, Jun 2025 to May 2026).
- Never cancelled in 311 scheduled flights.
- Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
Strong track record · 311 flights
Find United 1994 fares Opens this date on Aviasales
#2 · United 2300
7:05 AM → 9:39 AM4h 34m nonstop
Local times, typical schedule. Last flown 2026-05-31.
82%
chance on time
On time (history)
82%
Cancelled
0.0%
Avg arrival delay
3 min
- Arrived on time 82% of the time (11 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 84% on time; After 9 PM: 47%).
- Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find United 2300 fares Opens this date on Aviasales
#3 · American 2284
7:29 AM → 9:59 AM4h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
On time (history)
91%
Cancelled
0.0%
Avg arrival delay
6 min
- Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 84% on time; After 9 PM: 47%).
- Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
- 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
#4 · United 1525
1:29 PM → 3:56 PM4h 27m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
On time (history)
91%
Cancelled
0.0%
Avg arrival delay
6 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 44% of its 243 ground stops and delay programs started).
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find United 1525 fares Opens this date on Aviasales
#5 · United 1554
12:40 PM → 3:09 PM4h 29m nonstop
Local times, typical schedule. Last flown 2026-05-20.
78%
chance on time
On time (history)
79%
Cancelled
0.0%
Avg arrival delay
13 min
- Arrived on time 79% of the time (116 flights, Jun 2025 to May 2026).
- Never cancelled in 117 scheduled flights.
- Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
- 54% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 116 flights
Find United 1554 fares Opens this date on Aviasales
#6 · American 2545
12:09 PM → 2:35 PM4h 26m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
On time (history)
79%
Cancelled
0.0%
Avg arrival delay
16 min
- Arrived on time 79% of the time (103 flights, Jun 2025 to May 2026).
- Never cancelled in 103 scheduled flights.
- Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
- 67% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 103 flights
Find American 2545 fares Opens this date on Aviasales
#7 · American 820
8:15 AM → 10:48 AM4h 33m nonstop
Local times, typical schedule. Last flown 2026-04-06.
71%
chance on time
On time (history)
69%
Cancelled
0.0%
Avg arrival delay
17 min
- Arrived on time 69% of the time (45 flights, Jun 2025 to May 2026).
- Never cancelled in 46 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 84% on time; After 9 PM: 47%).
- Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
Limited track record · 45 flights
Find American 820 fares Opens this date on Aviasales
#8 · Alaska 325
2:09 PM → 4:50 PM4h 41m nonstop
Local times, typical schedule. Last flown 2026-05-31.
70%
chance on time
On time (history)
70%
Cancelled
0.9%
Avg arrival delay
16 min
- Arrived on time 70% of the time (348 flights, Jun 2025 to May 2026).
- Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
- 52% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 348 flights
Find Alaska 325 fares Opens this date on Aviasales
#9 · United 2133
4:05 PM → 6:34 PM4h 29m nonstop
Local times, typical schedule. Last flown 2026-04-29.
67%
chance on time
On time (history)
54%
Cancelled
0.0%
Avg arrival delay
37 min
- Arrived on time 54% of the time (28 flights, Jun 2025 to May 2026).
- Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (28 flights), so its score leans on the airline's record at this hour.
Limited track record · 28 flights
Find United 2133 fares Opens this date on Aviasales
#10 · United 1920
4:40 PM → 7:14 PM4h 34m nonstop
Local times, typical schedule. Last flown 2026-03-28.
67%
chance on time
On time (history)
50%
Cancelled
0.0%
Avg arrival delay
54 min
- Arrived on time 50% of the time (24 flights, Jun 2025 to May 2026).
- Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
- 68% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (24 flights), so its score leans on the airline's record at this hour.
Limited track record · 24 flights
Find United 1920 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

United Airlines73%
1,386 flights · 73% on time as flown · 0.5% cancel
Alaska Airlines72%
515 flights · 73% on time as flown · 0.9% cancel
American Airlines64%
829 flights · 65% on time as flown · 1.2% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

Before 9 AM84%
476 flights · avg delay 9 min
9 AM to noon79%
459 flights · avg delay 12 min
Noon to 3 PM74%
723 flights · avg delay 16 min
3 to 6 PM68%
403 flights · avg delay 25 min
6 to 9 PM57%
499 flights · avg delay 30 min
After 9 PM47%
170 flights · avg delay 37 min

Best day: Tuesday (78%). Worst: Friday (73%).

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 aircraft47%
Airline (crew, maintenance, boarding)30%
Air traffic control and airport volume19%
Severe weather5%

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 PDX questions

What time of day is best to fly ORD to PDX?: Before 9 AM: 84% of flights arrived on time, against 47% for departures after 9 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 PDX?: United, with a season-adjusted 73% chance of operating and arriving on time over 1,386 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 PDX?: July (69% on time); the best was September (88%), 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.

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