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Route · IAH → ATL · 2020–2025 BTS data

Houston to Atlanta

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), IAH to ATL (Houston to Atlanta) ranks #192 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

80.8%
On-time
+1.8 pts
vs US avg
74 min
Delay when late
26,071
Flights
#192 of 4927
Corpus placement

Cancelled

1.7%

Best Month

Sep 2025 91%

Worst Month

May 2024 59%

Distance

689 mi

Carriers

34

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 367 78 11 0 DL,F9,NK,UA
Nov 2025 401 79 10 0 UA,DL,F9,NK
Oct 2025 438 86 1 0 DL,UA,F9,NK
Sep 2025 384 34 1 0 UA,DL,NK,F9
Aug 2025 379 76 5 0 F9,NK,UA,DL
Jul 2025 413 114 6 1 DL,NK,UA,F9
Jun 2025 390 139 12 1 DL,UA,F9,NK
May 2025 395 120 3 0 DL,NK,UA,F9
Apr 2025 343 73 4 4 DL,F9,NK,UA
Mar 2025 366 81 0 1 DL,NK,UA,F9
Feb 2025 316 61 0 0 DL,UA,F9,NK
Jan 2025 323 58 27 0 OO,UA,NK,DL,F9
Dec 2024 375 96 2 0 DL,F9,NK,OO,UA
Nov 2024 402 70 2 0 OO,UA,NK,DL,F9
Oct 2024 422 58 2 0 UA,OO,DL,NK,F9
Sep 2024 381 73 7 0 NK,OO,UA,DL,F9
Aug 2024 418 85 8 0 DL,F9,NK,OO,UA
Jul 2024 386 142 41 3 DL,F9,NK,UA
Jun 2024 399 116 3 0 DL,F9,NK,UA
May 2024 400 164 4 1 DL,F9,NK,UA
Apr 2024 357 89 1 0 DL,F9,NK,UA
Mar 2024 375 66 0 0 DL,F9,NK,UA
Feb 2024 318 45 0 0 DL,F9,NK,UA
Jan 2024 334 77 4 1 DL,F9,NK,UA

IAH–ATL seasonal on-time pattern

Best: September (87.1%) · weakest: May (73.7%)

70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 80.2%

Strongest calendar month

September

87.1% on-time · ~366 flights/mo

Busiest calendar month

October

~394 flights/mo avg

Weakest calendar month

May

73.7% on-time · ~353 flights/mo

Cancellation Rate

1.7%

154 of 9,082 flights

Diversion Rate

0.1%

12 of 9,082 flights

Explore origin & destination

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

IAH - Houston

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

IAH on-time profile

ATL - Atlanta

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

ATL on-time profile

Compare the two airports

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

Compare IAH vs ATL

Origin-hub reliability standing

Mid-pack among IAH departures

From IAH, this corridor sits with 79 other 75–85% on-time routes out of 102 tracked departures, not the hub's reliability leaders (17 at ≥85%) and not the softest ( 6 below 75%). Destination: Atlanta · fleet on-time rank #2818 of 4927.

What the Data Says About IAH to ATL

26,071 tracked flights put the IAH to ATL pairing (Houston to Atlanta) at a 80.8% on-time rate, squarely in line with the wider network. Delays that do occur run 74.1 minutes on average. Across the 689-mile route and its 34 carriers, the trailing 24 months show 1.7% cancelled and 0.1% diverted (9,082 flights sampled).

The monthly split is wide on this route: Sep 2025 posted the strongest performance at 91% on-time, while May 2024 came in at just 59% - a 32-point swing worth factoring into travel timing.

On the multi-year calendar, IAH–ATL peaks in September at 87.1% on-time while October carries the heaviest traffic (~394 flights per month) ; the softest month is May at 73.7%, a 13.4-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does IAH to ATL rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, IAH to ATL ranks #192 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 IAH to ATL? ▼
Flights from Houston to Atlanta have a 80.8% on-time rate based on 26,071 flights. The average delay is 74.1 minutes. The best recent month was Sep 2025 with 91% on-time.
What is the cancellation rate for IAH to ATL? ▼
Over the last 24 months, 1.7% of flights on this route were cancelled (154 of 9,082 flights) and 0.1% were diverted.
How far is the flight from IAH to ATL? ▼
The flight distance from Houston (IAH) to Atlanta (ATL) is approximately 689 miles. This route is served by 34 carriers.
When is the best time to fly from IAH to ATL? ▼
The best recent month for on-time performance was Sep 2025 (91% on-time). The worst was May 2024 (59% on-time). Consider booking during months with historically better performance.

Airports on this route

IAH Airport

Houston
ATL Airport

Atlanta
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 IAH–ATL data

IAH–ATL is mid-pack at 80.8% on-time; month and carrier mix move more than the corridor headline.

  • Compare IAH and ATL airport profiles: delay causes and top routes differ even on the same corridor. IAH airport
  • If your dates flex, September (87.1% on-time) beats May (73.7%) on this corridor. Seasonal chart
  • 4 other routes post a similar 80.8% 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.