Route on-time record
PDX to IAH: most on-time flights and the best time to fly
Portland (Portland International Airport) to Houston (George Bush Intercontinental Airport). 1,238 nonstop flights in Jun 2025 to May 2026, 85% arrived within 15 minutes and 0.9% were cancelled. The most reliable flight number was United 462 at 7:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
PDX → IAH
Portland to Houston: 1,238 nonstop flights a year
On time (12 months)
85%
Cancelled
0.9%
avg delay 11 min
Best time to leave
Before 9 AM
94% on time vs 77% 9 AM to noon
Most reliable airline
United
86% chance on time
Lowest nonstop fare seen in the next two months: $274 (Alaska 1420 on 2026-11-25). 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 462
7:00 AM → 1:18 PM4h 17m nonstop
Local times, typical schedule. Last flown 2026-05-31.
92%
chance on time
- On time (history)
- 94%
- Cancelled
- 1.2%
- Avg arrival delay
- 5 min
- Arrived on time 94% of the time (159 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 94% on time; 9 AM to noon: 77%).
- Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
Moderate track record · 159 flights
Find United 462 fares Opens this date on Aviasales#2 · United 780
11:59 PM → 6:17 AM4h 18m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 21 min
- Arrived on time 89% of the time (45 flights, Jun 2025 to May 2026).
- Never cancelled in 45 scheduled flights.
Limited track record · 45 flights
Find United 780 fares Opens this date on Aviasales#3 · Alaska 1420
7:00 AM → 1:27 PM4h 27m nonstop
Local times, typical schedule. Last flown 2026-05-31.
80%
chance on time
- On time (history)
- 80%
- Cancelled
- 0.9%
- Avg arrival delay
- 11 min
- Arrived on time 80% of the time (343 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 94% on time; 9 AM to noon: 77%).
- Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
Strong track record · 343 flights
Find Alaska 1420 fares Opens this date on Aviasales#4 · United 1927
1:55 PM → 8:13 PM4h 18m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
- On time (history)
- 78%
- Cancelled
- 0.0%
- Avg arrival delay
- 15 min
- Arrived on time 78% of the time (64 flights, Jun 2025 to May 2026).
- Never cancelled in 64 scheduled flights.
- 63% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 64 flights
Find United 1927 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines86%
885 flights · 86% on time as flown · 0.9% cancel
- Alaska Airlines80%
353 flights · 80% on time as flown · 0.9% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM94%
419 flights · avg delay 4 min
- 9 AM to noon77%
299 flights · avg delay 13 min
- Noon to 3 PM78%
364 flights · avg delay 17 min
- After 9 PM88%
156 flights · avg delay 13 min
Best day: Tuesday (89%). Worst: Thursday (84%).
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
- Air traffic control and airport volume38%
- Late-arriving aircraft32%
- Airline (crew, maintenance, boarding)29%
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 IAH questions
- What time of day is best to fly PDX to IAH?
- Before 9 AM: 94% of flights arrived on time, against 77% for departures 9 AM to noon. 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 IAH?
- United, with a season-adjusted 86% 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 PDX to IAH?
- July (75% on time); the best was September (94%), 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
- IAH 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 ORD 77%
- PDX to DFW 80%
- PDX to SLC 88%
- PDX to SMF 83%
- PDX to SAN 80%
- PDX to SJC 82%
Most on-time flights from PDX on every route →
Live status: FAA delays and ground stops