PlainFlights

Route · ATL → IAH · 2020–2025 BTS data

Atlanta to Houston

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), ATL to IAH (Atlanta to Houston) ranks #191 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

79.5%
On-time
+0.5 pts
vs US avg
70 min
Delay when late
26,083
Flights
#191 of 4927
Corpus placement

Cancelled

1.7%

Best Month

Oct 2024 87%

Worst Month

Jun 2025 60%

Distance

689 mi

Carriers

37

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 369 96 11 1 DL,F9,NK,UA
Nov 2025 402 72 8 0 UA,DL,F9,NK
Oct 2025 439 92 2 1 DL,UA,F9,NK
Sep 2025 384 53 1 0 UA,DL,NK,F9
Aug 2025 380 102 4 0 F9,NK,UA,DL
Jul 2025 414 142 9 1 DL,NK,UA,F9
Jun 2025 390 156 13 4 UA,DL,F9,NK
May 2025 396 152 3 2 NK,UA,DL,F9
Apr 2025 343 85 3 1 DL,F9,NK,UA
Mar 2025 365 78 1 0 DL,NK,UA,F9
Feb 2025 315 71 0 0 DL,UA,F9,NK
Jan 2025 323 92 24 2 OO,UA,NK,DL,F9
Dec 2024 374 107 2 3 DL,F9,NK,OO,UA
Nov 2024 399 68 2 1 OO,UA,NK,DL,F9
Oct 2024 421 53 0 0 UA,OO,DL,NK,F9
Sep 2024 378 75 8 0 NK,OO,UA,DL,F9
Aug 2024 423 89 8 0 DL,F9,NK,OO,UA
Jul 2024 395 146 40 1 DL,F9,NK,UA
Jun 2024 402 111 4 4 DL,F9,NK,UA
May 2024 399 139 4 7 DL,F9,NK,UA
Apr 2024 356 65 0 3 DL,F9,NK,UA
Mar 2024 373 71 2 2 DL,F9,NK,UA
Feb 2024 319 51 0 0 DL,F9,NK,UA
Jan 2024 333 79 6 1 DL,F9,NK,UA

ATL–IAH seasonal on-time pattern

Best: September (85.5%) · weakest: July (72.0%)

70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 77.9%

Strongest calendar month

September

85.5% on-time · ~366 flights/mo

Busiest calendar month

October

~394 flights/mo avg

Weakest calendar month

July

72.0% on-time · ~375 flights/mo

Cancellation Rate

1.7%

155 of 9,092 flights

Diversion Rate

0.4%

34 of 9,092 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

ATL - Atlanta

Full on-time, delay-cause, and seasonal performance for Atlanta, GA.

ATL on-time profile

IAH - Houston

Full on-time, delay-cause, and seasonal performance for Houston, TX.

IAH on-time profile

Compare the two airports

See ATL and IAH side by side on delays, cancellations, and reliability.

Compare ATL vs IAH

Origin-hub reliability standing

Mid-pack among ATL departures

From ATL, this corridor sits with 75 other 75–85% on-time routes out of 144 tracked departures, not the hub's reliability leaders (67 at ≥85%) and not the softest ( 2 below 75%). Destination: Houston · fleet on-time rank #3327 of 4927.

What the Data Says About ATL to IAH

26,083 tracked flights put the ATL to IAH pairing (Atlanta to Houston) at a 79.5% on-time rate, squarely in line with the wider network. Delays that do occur run 70.1 minutes on average. Across the 689-mile route and its 37 carriers, the trailing 24 months show 1.7% cancelled and 0.4% diverted (9,092 flights sampled).

The monthly split is wide on this route: Oct 2024 posted the strongest performance at 87% on-time, while Jun 2025 came in at just 60% - a 27-point swing worth factoring into travel timing.

On the multi-year calendar, ATL–IAH peaks in September at 85.5% on-time while October carries the heaviest traffic (~394 flights per month) ; the softest month is July at 72.0%, a 13.5-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does ATL to IAH rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, ATL to IAH ranks #191 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from ATL to IAH? ▼
Flights from Atlanta to Houston have a 79.5% on-time rate based on 26,083 flights. The average delay is 70.1 minutes. The best recent month was Oct 2024 with 87% on-time.
What is the cancellation rate for ATL to IAH? ▼
Over the last 24 months, 1.7% of flights on this route were cancelled (155 of 9,092 flights) and 0.4% were diverted.
How far is the flight from ATL to IAH? ▼
The flight distance from Atlanta (ATL) to Houston (IAH) is approximately 689 miles. This route is served by 37 carriers.
When is the best time to fly from ATL to IAH? ▼
The best recent month for on-time performance was Oct 2024 (87% on-time). The worst was Jun 2025 (60% on-time). Consider booking during months with historically better performance.

Airports on this route

ATL Airport

Atlanta
IAH Airport

Houston
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using ATL–IAH data

ATL–IAH is mid-pack at 79.5% on-time; month and carrier mix move more than the corridor headline.

  • Compare ATL and IAH airport profiles: delay causes and top routes differ even on the same corridor. ATL airport
  • If your dates flex, September (85.5% on-time) beats July (72.0%) on this corridor. Seasonal chart
  • 4 other routes post a similar 79.5% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.