Route on-time record
IAD to IAH: most on-time flights and the best time to fly
Dulles (Washington Dulles International Airport) to Houston (George Bush Intercontinental Airport). 1,865 nonstop flights in Jun 2025 to May 2026, 83% arrived within 15 minutes and 0.6% were cancelled. The most reliable flight number was United 1524 at 8:30 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
IAD → IAH
Dulles to Houston: 1,865 nonstop flights a year
On time (12 months)
83%
Cancelled
0.6%
avg delay 12 min
Best time to leave
Before 9 AM
91% on time vs 68% 3 to 6 PM
Most reliable airline
United
82% chance on time
Lowest nonstop fare seen in the next two months: $339 (United 1524 on 2026-11-03). 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 1524
8:30 AM → 11:03 AM3h 33m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.6%
- Avg arrival delay
- 8 min
- Arrived on time 91% of the time (332 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 68%).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
Strong track record · 332 flights
Find United 1524 fares Opens this date on Aviasales#2 · United 1041
6:00 AM → 8:27 AM3h 27m nonstop
Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as United 1131, 1409; its record covers all of them.
90%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 92% of the time (71 flights, Jun 2025 to May 2026).
- Never cancelled in 71 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 68%).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
Moderate track record · 71 flights
Find United 1041 fares Opens this date on Aviasales#3 · United 1907
6:30 AM → 8:39 AM3h 09m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
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: 91% on time; 3 to 6 PM: 68%).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 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 1907 fares Opens this date on Aviasales#4 · United 2050
10:20 PM → 12:45 AM3h 25m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1463; its record covers all of them.
84%
chance on time
- On time (history)
- 90%
- Cancelled
- 3.1%
- Avg arrival delay
- 7 min
- Arrived on time 90% of the time (31 flights, Jun 2025 to May 2026).
- Cancelled 3.1% of the time (1 of 32).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
- Short track record (31 flights), so its score leans on the airline's record at this hour.
Limited track record · 31 flights
Find United 2050 fares Opens this date on Aviasales#5 · United 2437
10:11 PM → 12:30 AM3h 19m nonstop
Local times, typical schedule. Last flown 2026-04-29.
83%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 6 min
- Arrived on time 89% of the time (27 flights, Jun 2025 to May 2026).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
- Short track record (27 flights), so its score leans on the airline's record at this hour.
Limited track record · 27 flights
Find United 2437 fares Opens this date on Aviasales#6 · United 1535
12:50 PM → 3:23 PM3h 33m nonstop
Local times, typical schedule. Last flown 2026-05-31.
82%
chance on time
- On time (history)
- 83%
- Cancelled
- 1.1%
- Avg arrival delay
- 14 min
- Arrived on time 83% of the time (279 flights, Jun 2025 to May 2026).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
- Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
Strong track record · 279 flights
Find United 1535 fares Opens this date on Aviasales#7 · United 2213
10:05 PM → 12:30 AM3h 25m nonstop
Local times, typical schedule. Last flown 2026-03-28.
77%
chance on time
- On time (history)
- 74%
- Cancelled
- 4.2%
- Avg arrival delay
- 27 min
- Arrived on time 74% of the time (23 flights, Jun 2025 to May 2026).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find United 2213 fares Opens this date on Aviasales#8 · United 2857
2:53 PM → 5:11 PM3h 18m nonstop
Local times, typical schedule. Last flown 2026-05-31.
77%
chance on time
- On time (history)
- 64%
- Cancelled
- 0.0%
- Avg arrival delay
- 26 min
- Arrived on time 64% of the time (11 flights, Jun 2025 to May 2026).
- Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find United 2857 fares Opens this date on Aviasales#9 · United 2474
5:50 PM → 8:33 PM3h 43m nonstop
Local times, typical schedule. Last flown 2026-03-28.
72%
chance on time
- On time (history)
- 75%
- Cancelled
- 0.0%
- Avg arrival delay
- 26 min
- Arrived on time 75% of the time (24 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 68% on time; Before 9 AM: 91%).
- Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
- Short track record (24 flights), so its score leans on the airline's record at this hour.
Limited track record · 24 flights
Find United 2474 fares Opens this date on Aviasales#10 · United 2217
5:37 PM → 8:10 PM3h 33m nonstop
Local times, typical schedule. Last flown 2026-05-31.
68%
chance on time
- On time (history)
- 67%
- Cancelled
- 0.3%
- Avg arrival delay
- 22 min
- Arrived on time 67% of the time (340 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 68% on time; Before 9 AM: 91%).
- Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 340 flights
Find United 2217 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines82%
1,865 flights · 83% on time as flown · 0.6% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM91%
712 flights · avg delay 6 min
- 9 AM to noon90%
68 flights · avg delay 10 min
- Noon to 3 PM84%
372 flights · avg delay 13 min
- 3 to 6 PM68%
426 flights · avg delay 22 min
- After 9 PM81%
286 flights · avg delay 11 min
Best day: Tuesday (83%). Worst: Saturday (79%).
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 volume35%
- Late-arriving aircraft29%
- Airline (crew, maintenance, boarding)27%
- Severe weather8%
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
IAD to IAH questions
- What time of day is best to fly IAD to IAH?
- Before 9 AM: 91% of flights arrived on time, against 68% 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 IAD to IAH?
- United, with a season-adjusted 82% chance of operating and arriving on time over 1,865 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 IAD to IAH?
- July (67% on time); the best was November (89%), 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 IAD
- IAH to IAD (return)
- IAD to ATL 78%
- IAD to DEN 81%
- IAD to SFO 79%
- IAD to LAX 80%
- IAD to MCO 81%
- IAD to CLT 83%
- IAD to ORD 75%
- IAD to SEA 76%
- IAD to DFW 77%
- IAD to BOS 75%
- IAD to EWR 73%
- IAD to TPA 79%
Live status: FAA delays and ground stops