Route on-time record
IAH to PDX: most on-time flights and the best time to fly
Houston (George Bush Intercontinental Airport) to Portland (Portland International Airport). 1,238 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 0.9% were cancelled. The most reliable flight number was United 740 at 9:55 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
IAH → PDX
Houston to Portland: 1,238 nonstop flights a year
On time (12 months)
80%
Cancelled
0.9%
avg delay 14 min
Best time to leave
9 AM to noon
87% on time vs 77% 6 to 9 PM
Most reliable airline
United
80% 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 · United 740
9:55 AM → 12:34 PM4h 43m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.3%
- Avg arrival delay
- 12 min
- Arrived on time 87% of the time (364 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 87% on time; 6 to 9 PM: 77%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Strong track record · 364 flights
Find United 740 fares Opens this date on Aviasales#2 · United 1964
4:55 PM → 7:38 PM4h 43m nonstop
Local times, typical schedule. Last flown 2026-05-31.
80%
chance on time
- On time (history)
- 79%
- Cancelled
- 0.0%
- Avg arrival delay
- 18 min
- Arrived on time 79% of the time (28 flights, Jun 2025 to May 2026).
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- 70% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 28 flights
Find United 1964 fares Opens this date on Aviasales#3 · Alaska 1421
2:27 PM → 4:58 PM4h 31m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
- On time (history)
- 79%
- Cancelled
- 1.1%
- Avg arrival delay
- 15 min
- Arrived on time 79% of the time (347 flights, Jun 2025 to May 2026).
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- 56% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 347 flights
Find Alaska 1421 fares Opens this date on Aviasales#4 · United 1420
8:15 PM → 10:58 PM4h 43m nonstop
Local times, typical schedule. Last flown 2026-05-31.
76%
chance on time
- On time (history)
- 76%
- Cancelled
- 1.1%
- Avg arrival delay
- 14 min
- Arrived on time 76% of the time (354 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 77% on time; 9 AM to noon: 87%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Strong track record · 354 flights
Find United 1420 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines80%
885 flights · 81% on time as flown · 0.8% cancel
- Alaska Airlines78%
353 flights · 79% on time as flown · 1.1% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- 9 AM to noon87%
365 flights · avg delay 12 min
- 3 to 6 PM78%
457 flights · avg delay 17 min
- 6 to 9 PM77%
381 flights · avg delay 14 min
Best day: Tuesday (81%). Worst: Thursday (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
- Late-arriving aircraft50%
- Airline (crew, maintenance, boarding)22%
- Severe weather14%
- Air traffic control and airport volume12%
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
IAH to PDX questions
- What time of day is best to fly IAH to PDX?
- 9 AM to noon: 87% of flights arrived on time, against 77% for departures 6 to 9 PM.
- Which airline is most on time from IAH to PDX?
- United, with a season-adjusted 80% chance of operating and arriving on time over 885 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 IAH to PDX?
- June (66% on time); the best was September (85%), 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 IAH
- PDX to IAH (return)
- IAH to ORD 75%
- IAH to DFW 75%
- IAH to LAX 83%
- IAH to ATL 77%
- IAH to DEN 81%
- IAH to LGA 72%
- IAH to EWR 74%
- IAH to MIA 78%
- IAH to MCO 81%
- IAH to SFO 79%
- IAH to LAS 82%
- IAH to DCA 75%
Most on-time flights from IAH on every route →
Live status: FAA delays and ground stops