Atlanta (ATL) to Houston (IAH) flights
Delta Air Lines, United Airlines, Frontier Airlines, Mesa Airlines fly nonstop from Hartsfield Jackson Atlanta International Airport to George Bush Intercontinental Airport, with about 99 flights a week in July 2026. The 689-mile flight takes about 2h 13m gate to gate.
- Distance
- 689 mi · 1,109 km
- Flight time
- 2h 13m
- Airlines
- 4
- Seats filled
- 81%
Airlines flying ATL to IAH
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Delta Air Lines | 53 | Airbus A321, Airbus A320-100/200, Airbus A319 | 373,191 | 2h 10m |
| United Airlines | 20 | Airbus A319, Airbus A320-100/200, Boeing 737-700 / MAX 7 | 132,328 | 2h 16m |
| Frontier Airlines | 20 | Airbus A321, Airbus A320neo, Airbus A320-100/200 | 142,821 | 2h 17m |
| Mesa Airlines | 6 | Embraer E175 | 22,667 | 2h 18m |
| Spirit AirlinesCeased operations 2026-05-02 | n/a | Airbus A320-100/200, Airbus A321, Airbus A320neo | 50,802 | 2h 11m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
ATL to IAH flight schedule
16 flight numbers flew this route in August 2026, 15 of them almost daily. The first usually leaves at 6:07am and the last at 10:43pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| F9 1403Frontier Airlines | 6:07am | 7:20am | 31 | 75% |
| UA 532United Airlines | 7:05am | 8:26am | 31 | 89% |
| DL 1585Delta Air Lines | 7:32am | 8:37am | 31 | 82% |
| DL 1682Delta Air Lines | 10:06am | 11:15am | 31 | 85% |
| F9 2399Frontier Airlines | 10:08am | 11:27am | 25 | 76% |
| UA 425United Airlines | 11:40am | 12:56pm | 31 | 88% |
| DL 1572Delta Air Lines | 12:21pm | 1:27pm | 31 | 86% |
| DL 2890Delta Air Lines | 2:32pm | 3:42pm | 31 | 70% |
| UA 3992United Airlines · operated by Mesa Airlines | 3:57pm | 5:23pm | 8 | 70% |
| UA 3987United Airlines · operated by Mesa Airlines | 4:03pm | 5:25pm | 21 | 76% |
| DL 1223Delta Air Lines | 4:26pm | 5:40pm | 26 | 69% |
| DL 1131Delta Air Lines | 6:45pm | 7:54pm | 30 | 61% |
| UA 2376United Airlines | 6:57pm | 8:17pm | 26 | 64% |
| DL 1284Delta Air Lines | 8:10pm | 9:21pm | 31 | 72% |
| F9 4075Frontier Airlines | 9:15pm | 10:29pm | 31 | 61% |
| DL 1601Delta Air Lines | 10:43pm | 11:52pm | 31 | 75% |
Is ATL to IAH on time?
From September 2025 to August 2026, 77% of 5,279 flights arrived within 15 minutes of schedule and 1.7% were cancelled. Flights leaving around 11am were the most punctual (88%), those around 6pm the least (61%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (38%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Delta Air Lines | 2,543 | 76% | 15 min | 2% |
| United Airlines | 1,601 | 84% | 12 min | 0.7% |
| Frontier Airlines | 827 | 70% | 28 min | 1.6% |
| Spirit Airlines | 308 | 68% | 27 min | 5.5% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 6am to 7am | 171 | 82% | |
| 7am to 8am | 679 | 84% | |
| 8am to 9am | 140 | 86% | |
| 9am to 10am | 467 | 81% | |
| 10am to 11am | 198 | 84% | |
| 11am to 12pm | 450 | 88% | |
| 12pm to 1pm | 238 | 84% | |
| 1pm to 2pm | 154 | 84% | |
| 2pm to 3pm | 245 | 71% | |
| 3pm to 4pm | 541 | 76% | |
| 4pm to 5pm | 334 | 67% | |
| 6pm to 7pm | 289 | 61% | |
| 7pm to 8pm | 389 | 83% | |
| 8pm to 9pm | 199 | 62% | |
| 9pm to 10pm | 339 | 62% | |
| 10pm to 11pm | 368 | 75% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 456 | 58,520 | |
| September 2025 | 427 | 55,787 | |
| October 2025 | 466 | 64,837 | |
| November 2025 | 432 | 58,244 | |
| December 2025 | 418 | 58,029 | |
| January 2026 | 401 | 51,220 | |
| February 2026 | 386 | 53,802 | |
| March 2026 | 422 | 61,668 | |
| April 2026 | 474 | 65,885 | |
| May 2026 | 465 | 67,825 | |
| June 2026 | 422 | 61,583 | |
| July 2026 | 444 | 65,459 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.