Route on-time record
IAH to LAX: most on-time flights and the best time to fly
Houston (George Bush Intercontinental Airport) to Los Angeles (Los Angeles International Airport). 5,294 nonstop flights in Jun 2025 to May 2026, 83% arrived within 15 minutes and 0.7% were cancelled. The most reliable flight number was United 417 at 6:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
IAH → LAX
Houston to Los Angeles: 5,294 nonstop flights a year
On time (12 months)
83%
Cancelled
0.7%
avg delay 12 min
Best time to leave
Before 9 AM
94% on time vs 74% 6 to 9 PM
Most reliable airline
Delta
87% 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 417
6:00 AM → 7:29 AM3h 29m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 2431; its record covers all of them.
95%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.5%
- Avg arrival delay
- 2 min
- Arrived on time 96% of the time (362 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 94% on time; 6 to 9 PM: 74%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Strong track record · 362 flights
Find United 417 fares Opens this date on Aviasales#2 · Delta 1216
6:45 AM → 8:38 AM3h 38m nonstop
Local times, typical schedule. Last flown 2026-05-31.
93%
chance on time
- On time (history)
- 93%
- Cancelled
- 0.5%
- Avg arrival delay
- 8 min
- Arrived on time 93% of the time (363 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 94% on time; 6 to 9 PM: 74%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Strong track record · 363 flights
Find Delta 1216 fares Opens this date on Aviasales#3 · United 2600
7:20 AM → 9:05 AM3h 43m nonstop
Local times, typical schedule. Last flown 2026-05-31.
92%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 92% of the time (355 flights, Jun 2025 to May 2026).
- Never cancelled in 355 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 94% on time; 6 to 9 PM: 74%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Strong track record · 355 flights
Find United 2600 fares Opens this date on Aviasales#4 · United 2460
12:25 PM → 2:08 PM3h 43m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.3%
- Avg arrival delay
- 11 min
- Arrived on time 88% of the time (364 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.
Strong track record · 364 flights
Find United 2460 fares Opens this date on Aviasales#5 · United 469
9:37 AM → 11:20 AM3h 43m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.6%
- Avg arrival delay
- 7 min
- Arrived on time 88% of the time (347 flights, Jun 2025 to May 2026).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Strong track record · 347 flights
Find United 469 fares Opens this date on Aviasales#6 · United 1945
2:20 PM → 4:12 PM3h 43m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.0%
- Avg arrival delay
- 10 min
- Arrived on time 87% of the time (331 flights, Jun 2025 to May 2026).
- Never cancelled in 333 scheduled flights.
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- Lands inside LAX's trouble window: 53% of its 15 ground stops and delay programs started between 4 PM and 10 PM.
Strong track record · 331 flights
Find United 1945 fares Opens this date on Aviasales#7 · United 1355
2:47 PM → 4:30 PM3h 43m nonstop
Local times, typical schedule. Last flown 2026-04-29.
85%
chance on time
- On time (history)
- 84%
- Cancelled
- 0.0%
- Avg arrival delay
- 13 min
- Arrived on time 84% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- Lands inside LAX's trouble window: 53% of its 15 ground stops and delay programs started between 4 PM and 10 PM.
Limited track record · 32 flights
Find United 1355 fares Opens this date on Aviasales#8 · Delta 1563
4:00 PM → 5:41 PM3h 41m nonstop
Local times, typical schedule. Last flown 2026-05-06. Same departure also flew as Delta 1035; its record covers all of them.
84%
chance on time
- On time (history)
- 86%
- Cancelled
- 1.9%
- Avg arrival delay
- 6 min
- Arrived on time 86% of the time (51 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.
- Lands inside LAX's trouble window: 53% of its 15 ground stops and delay programs started between 4 PM and 10 PM.
- Short track record (51 flights), so its score leans on the airline's record at this hour.
Limited track record · 51 flights
Find Delta 1563 fares Opens this date on Aviasales#9 · Delta 1143
4:08 PM → 5:50 PM3h 42m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
- On time (history)
- 84%
- Cancelled
- 3.1%
- Avg arrival delay
- 33 min
- Arrived on time 84% of the time (31 flights, Jun 2025 to May 2026).
- Cancelled 3.1% of the time (1 of 32).
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
- Lands inside LAX's trouble window: 53% of its 15 ground stops and delay programs started between 4 PM and 10 PM.
Limited track record · 31 flights
Find Delta 1143 fares Opens this date on Aviasales#10 · United 2658
6:38 PM → 8:47 PM3h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
82%
chance on time
- On time (history)
- 84%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 84% of the time (153 flights, Jun 2025 to May 2026).
- Never cancelled in 153 scheduled flights.
- Leaves in this route's least on-time window (6 to 9 PM: 74% on time; Before 9 AM: 94%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Moderate track record · 153 flights
Find United 2658 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Delta Air Lines87%
646 flights · 88% on time as flown · 1.1% cancel
- United Airlines83%
3,394 flights · 84% on time as flown · 0.4% cancel
- Spirit Airlines83%
513 flights · 84% on time as flown · 1.4% cancel
- SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)79%
409 flights · 79% on time as flown · 0.5% cancel
- Frontier Airlines71%
332 flights · 70% on time as flown · 1.0% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM94%
1,289 flights · avg delay 5 min
- 9 AM to noon80%
591 flights · avg delay 12 min
- Noon to 3 PM87%
693 flights · avg delay 10 min
- 3 to 6 PM80%
962 flights · avg delay 15 min
- 6 to 9 PM74%
1,179 flights · avg delay 19 min
- After 9 PM79%
580 flights · avg delay 15 min
Best day: Wednesday (85%). Worst: Sunday (80%).
Smarter routing
Nearby airports that run more on time
IAH → SNA 87% chance on time
George Bush Intercontinental Airport to John Wayne Orange County International Airport · 1,094 flights a year · 36 mi from your airports · yours: 82%
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)40%
- Late-arriving aircraft34%
- Air traffic control and airport volume16%
- Severe weather9%
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 LAX questions
- What time of day is best to fly IAH to LAX?
- Before 9 AM: 94% of flights arrived on time, against 74% for departures 6 to 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 IAH to LAX?
- Delta, with a season-adjusted 87% chance of operating and arriving on time over 646 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 LAX?
- June (70% on time); the best was October (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.
More routes from IAH
- LAX to IAH (return)
- IAH to ORD 75%
- IAH to DFW 75%
- IAH to ATL 77%
- IAH to DEN 81%
- IAH to LGA 72%
- IAH to MIA 78%
- IAH to EWR 74%
- IAH to MCO 81%
- IAH to SFO 79%
- IAH to LAS 82%
- IAH to DCA 75%
- IAH to MSY 83%
Live status: FAA delays and ground stops