Route on-time record
IAH to ATL: most on-time flights and the best time to fly
Houston (George Bush Intercontinental Airport) to Atlanta (Hartsfield Jackson Atlanta International Airport). 4,900 nonstop flights in Jun 2025 to May 2026, 77% arrived within 15 minutes and 2.0% were cancelled. The most reliable flight number was United 1030 at 7:35 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
IAH → ATL
Houston to Atlanta: 4,900 nonstop flights a year
On time (12 months)
77%
Cancelled
2.0%
avg delay 17 min
Best time to leave
Before 9 AM
83% on time vs 66% 3 to 6 PM
Most reliable airline
United
81% 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 1030
7:35 AM → 10:43 AM2h 08m nonstop
Local times, typical schedule. Last flown 2026-05-30.
91%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.6%
- Avg arrival delay
- 7 min
- Arrived on time 92% of the time (171 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 83% on time; 3 to 6 PM: 66%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Moderate track record · 171 flights
Find United 1030 fares Opens this date on Aviasales#2 · Delta 1315
7:00 AM → 10:00 AM2h 04m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 88%
- Cancelled
- 1.9%
- Avg arrival delay
- 12 min
- Arrived on time 88% of the time (358 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 83% on time; 3 to 6 PM: 66%).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Strong track record · 358 flights
Find Delta 1315 fares Opens this date on Aviasales#3 · Delta 1069
5:23 AM → 8:20 AM2h 04m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
- On time (history)
- 89%
- Cancelled
- 2.7%
- Avg arrival delay
- 9 min
- Arrived on time 89% of the time (355 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 83% on time; 3 to 6 PM: 66%).
- 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 Delta 1069 fares Opens this date on Aviasales#4 · United 1746
11:55 AM → 3:01 PM2h 06m nonstop
Local times, typical schedule. Last flown 2026-05-20.
84%
chance on time
- On time (history)
- 84%
- Cancelled
- 0.7%
- Avg arrival delay
- 11 min
- Arrived on time 84% of the time (135 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).
- Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
Moderate track record · 135 flights
Find United 1746 fares Opens this date on Aviasales#5 · United 1416
2:55 PM → 6:00 PM2h 05m nonstop
Local times, typical schedule. Last flown 2026-03-27.
83%
chance on time
- On time (history)
- 82%
- Cancelled
- 0.0%
- Avg arrival delay
- 20 min
- Arrived on time 82% of the time (17 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 ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
- 61% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 17 flights
Find United 1416 fares Opens this date on Aviasales#6 · United 462
2:45 PM → 5:55 PM2h 10m nonstop
Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as United 1936; its record covers all of them.
80%
chance on time
- On time (history)
- 81%
- Cancelled
- 0.9%
- Avg arrival delay
- 22 min
- Arrived on time 81% of the time (219 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 ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 219 flights
Find United 462 fares Opens this date on Aviasales#7 · United 1591
8:07 PM → 11:15 PM2h 08m nonstop
Local times, typical schedule. Last flown 2026-05-20.
79%
chance on time
- On time (history)
- 78%
- Cancelled
- 0.0%
- Avg arrival delay
- 13 min
- Arrived on time 78% of the time (63 flights, Jun 2025 to May 2026).
- Never cancelled in 63 scheduled flights.
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Moderate track record · 63 flights
Find United 1591 fares Opens this date on Aviasales#8 · Delta 2709
4:56 PM → 7:59 PM2h 03m nonstop
Local times, typical schedule. Last flown 2026-05-06. Same departure also flew as Delta 1223; its record covers all of them.
78%
chance on time
- On time (history)
- 81%
- Cancelled
- 1.7%
- Avg arrival delay
- 17 min
- Arrived on time 81% of the time (354 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 66% on time; Before 9 AM: 83%).
- Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
Strong track record · 354 flights
Find Delta 2709 fares Opens this date on Aviasales#9 · Delta 1585
9:49 AM → 12:54 PM2h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
- On time (history)
- 79%
- Cancelled
- 3.4%
- Avg arrival delay
- 14 min
- Arrived on time 79% of the time (311 flights, Jun 2025 to May 2026).
- Cancelled 3.4% of the time (11 of 322).
- Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
Strong track record · 311 flights
Find Delta 1585 fares Opens this date on Aviasales#10 · Delta 1572
2:59 PM → 6:02 PM2h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
- On time (history)
- 79%
- Cancelled
- 1.7%
- Avg arrival delay
- 18 min
- Arrived on time 79% of the time (295 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 ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 295 flights
Find Delta 1572 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines81%
1,236 flights · 82% on time as flown · 0.9% cancel
- Delta Air Lines78%
2,491 flights · 80% on time as flown · 2.3% cancel
- Spirit Airlines73%
435 flights · 75% on time as flown · 3.3% cancel
- Frontier Airlines61%
738 flights · 60% on time as flown · 2.1% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM83%
1,666 flights · avg delay 12 min
- 9 AM to noon80%
791 flights · avg delay 12 min
- Noon to 3 PM78%
842 flights · avg delay 20 min
- 3 to 6 PM66%
651 flights · avg delay 28 min
- 6 to 9 PM71%
947 flights · avg delay 22 min
Best day: Wednesday (81%). Worst: Sunday (73%).
Smarter routing
Nearby airports that run more on time
HOU → ATL 78% chance on time
William P. Hobby Airport to Hartsfield Jackson Atlanta International Airport · 2,953 flights a year · 24 mi from your airports · yours: 76%
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 aircraft41%
- Airline (crew, maintenance, boarding)33%
- Air traffic control and airport volume23%
- Severe weather3%
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 ATL questions
- What time of day is best to fly IAH to ATL?
- Before 9 AM: 83% of flights arrived on time, against 66% 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 IAH to ATL?
- United, with a season-adjusted 81% chance of operating and arriving on time over 1,236 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 ATL?
- 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
- ATL to IAH (return)
- IAH to ORD 75%
- IAH to DFW 75%
- IAH to LAX 83%
- 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