IAH to ATL flight delays & on-time performance
Nonstop flights from George Bush Intercontinental Airport to Hartsfield Jackson Atlanta International Airport · 689 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at IAH or ATL right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Houston (IAH) to Atlanta (ATL) arrived on time 77% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 2% were cancelled, and 8% arrived an hour or more late.
- United Airlines was the most punctual airline here (81% on time); Frontier Airlines was the least (62%).
- Departures scheduled around 7am did best (90% on time); around 5pm did worst (66%).
- Wednesday was the most reliable day to fly (83% on time) and Sunday the least (69%).
- The largest source of delay minutes was late-arriving aircraft (39%).
Which airline is most on time from IAH to ATL?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| United Airlines | 81% | 0.6% | 13 min | 6.4% | 1,263 |
| Delta Air Lines | 80% | 2.1% | 14 min | 7.0% | 2,520 |
| Spirit Airlines | 75% | 4.8% | 16 min | 8.2% | 334 |
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 75% | 0.0% | 5 min | 0.0% | 4 |
| Frontier Airlines | 62% | 2.9% | 27 min | 13.4% | 798 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am87%492 flights
- 6am68%326 flights
- 7am90%694 flights
- 8am88%154 flights
- 9am76%305 flights
- 10am77%68 flights
- 11am82%424 flights
- 12pm75%253 flights
- 1pm82%185 flights
- 2pm74%424 flights
- 3pm84%75 flights
- 4pm70%309 flights
- 5pm66%191 flights
- 6pm66%671 flights
- 7pm70%63 flights
- 8pm72%282 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday77%2.8% cancelled
- Tuesday79%1.5% cancelled
- Wednesday83%0.9% cancelled
- Thursday80%0.3% cancelled
- Friday77%2.1% cancelled
- Saturday76%2.7% cancelled
- Sunday69%3.7% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft39%
- Airline (crew, maintenance, cleaning, fueling)33%
- Air traffic control & airport congestion26%
- Extreme weather2%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)59%
- Extreme weather39%
- Air traffic control & airport congestion2%
- Security0%
IAH to ATL: common questions
- How often are IAH to ATL flights on time?
- 77% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Houston to Atlanta cancelled?
- 2.0% of scheduled flights were cancelled (98 of 4,919).
- How long are typical delays?
- Across all flights the average arrival delay was 16 min (early arrivals count as zero). Flights that were late arrived 66 min behind schedule on average, and 7.9% of flights were an hour or more late.
- How long is taxi time at IAH?
- Flights on this route spent 18 min taxiing from the gate to takeoff on average.
Related routes
Return trip: ATL to IAH — 76% on time
More flights from Houston
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: IAH → ATL, nonstop flights by US airlines that report to the DOT. How we calculate this.