Atlanta to Houston (ATL–IAH) — Airlines, Schedules & Connections
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No nonstop flights on this route. connecting options below.
ATL–IAH is served by 4 airlines with nonstop service. Delta Air Lines, United Airlines and Spirit Airlines lead the route. The flight covers 688 miles in approximately 1h 39m. Beyond nonstop, 186 hubs offer 1-stop connections.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| DL Delta Air Lines Also: AF, AM, KE, LA, SK, WS | 61 | 320, 321 | 2h03-2h53 | SkyTeam | AF, AM, KE, LA, SK, WS | |
| UA United Airlines Also: EK, NH, NZ | 52 | 319, 739, 73G, 7M9, E75L, E7W | 2h18-2h32 | Star Alliance | EK, NH, NZ | |
| NK Spirit Airlines | 22 | 320, 32B | 2h10-2h20 | – | – | |
| F9 Frontier Also: Y4 | 21 | 321, 32N, A21N | 2h17-2h35 | – | Y4 |
Weekly Schedule Pattern
Connection Landscape
Other ways to reach Houston from Atlanta
| Metric | ATL→IAH | PDK→IAH | CHA→IAH |
|---|---|---|---|
| Distance from ATL | – | 18 mi | 106 mi |
| Nonstop airlines | 4 | 1 | 2 |
| Weekly flights | 324 | 1 | 21 |
| Flight time | 1h 39m | 1h 40m | 2h 20m |
| Departure OTP | 81% | – | – |
Travel Essentials
ATL: EDT · IAH: CDT
When it's 6:00 PM in Atlanta, it's 5:00 PM in Houston.
MARTA Gold Line runs every 12–15 minutes from downtown Five Points station to the airport (16 min, $2.50). The station connects directly to the Domestic terminal via SkyTrain. Ride-shares cost $20–35 from downtown.
Economy parking in the North/South garages fills quickly; off-site lots on Camp Creek Parkway offer cheaper rates with shuttles.
No direct rail from IAH. The METRO bus 102 (IAH Express) runs to downtown Houston's transit center (60–90 min, $1.25). Taxis to downtown Houston cost $50–70. Ride-hails pick up at the designated Rideshare zones outside baggage claim on the lower level.IAH has five terminals (A–E) connected by an underground tunnel with trams. Terminal D handles international arrivals. Rental car agencies are in a consolidated facility adjacent to Terminal C; a free IAH Connector bus runs between terminals and the rental car center. The Galleria / Uptown area costs $35–50 by ride-hail.
Humid subtropical climate. Hot, humid, and wet for much of the year. Summers are brutal (33–38°C) with high humidity and near-daily afternoon thunderstorms. Severe storms with hail and high winds regularly cause ground stops from April through September. Houston's flooding risk is significant. Heavy rain events, including tropical system remnants, have flooded airport roads, cutting off surface access even when the airport itself remains operational.
Winters are mild (5–18°C) with occasional ice storms. These are rare but highly disruptive when they occur. Hurricane season (June–November) requires monitoring for Gulf storms. October through March has the best flying weather.
ATL–IAH Quick Facts
Frequently Asked Questions
Atlanta to Houston Intercontinental: The Southeast–Gulf Coast Artery
ATL–IAH is the mirror corridor of IAH–ATL, reflecting the two-way hub-to-hub traffic between Delta's Atlanta base and United's Houston hub. Departures from Atlanta show the same density as the reverse direction: Delta and United combined operate 6–10 daily flights. Block time is under 2 hours westbound. The route sustains demand from energy sector executives traveling between Atlanta's corporate headquarters and Houston's oil, gas, and petrochemical industries, alongside the large connecting passenger base using each hub to reach international or domestic spoke cities. Hartsfield-Jackson handles over 100 million passengers annually, and IAH is among the top five US airports for international departures.
Connection Patterns and the Bidirectional Hub Market
Passengers flying ATL–IAH often originate in the Southeast and are connecting through Houston to Latin America, Mexico City, or the Gulf Coast oil industry cities. Those flying the reverse direction may be arriving from Latin America via IAH and connecting at ATL to the Southeast, Florida, or the Caribbean. Delta and United have a limited codeshare relationship on some routes but compete directly on ATL–IAH. Both airports' loyalty programs weight this route heavily due to the hub-to-hub mileage accumulation opportunity. The route is one of the most reliable rebooking corridors in the US when disruption occurs, given the depth of frequency on both carriers combined.