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Route · IAH → BHM · 2020–2025 BTS data

Houston to Birmingham

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), IAH to BHM (Houston to Birmingham) ranks #3356 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

83%
On-time
+4 pts
vs US avg
73 min
Delay when late
2,876
Flights
#3356 of 4927
Corpus placement

Cancelled

1.9%

Best Month

Nov 2023 87%

Worst Month

Jul 2021 46%

Distance

562 mi

Carriers

11

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Jun 2025 48 18 2 0 OO
Nov 2024 63 8 0 0 OO
Oct 2024 31 8 0 0 OO
Aug 2024 45 7 1 0 OO
Jul 2024 60 32 7 1 OO
Dec 2023 37 6 0 0 OO
Nov 2023 79 10 0 0 OO
Oct 2023 62 15 0 0 OO,UA
Sep 2023 65 12 0 0 OO,UA
Apr 2023 61 8 1 0 OO
Mar 2023 41 5 0 1 OO
Feb 2023 57 10 0 0 OO
Sep 2022 35 4 0 0 OO,UA,YV
May 2022 86 17 1 1 OO,YV
Apr 2022 60 8 1 0 OO,YV
Mar 2022 36 8 0 0 OO,YV
Feb 2022 41 6 0 1 YV,OO
Jan 2022 58 10 7 0 OO,YV
Oct 2021 89 31 1 1 OO,UA,YV
Sep 2021 102 18 1 0 OO,YV
Aug 2021 93 37 4 1 OO
Jul 2021 93 50 2 0 OO,YV
Jun 2021 87 36 0 0 OO,YV
May 2021 71 16 0 1 OO,YV

IAH–BHM seasonal on-time pattern

Best: April (91.6%) · weakest: July (60.9%)

50%60%70%80%90%100% JanFebMarAprMayJunJulAugSepOctNovDec 84.9%

Strongest calendar month

April

91.6% on-time · ~77 flights/mo

Busiest calendar month

January

~96 flights/mo avg

Weakest calendar month

July

60.9% on-time · ~72 flights/mo

Cancellation Rate

1.9%

28 of 1,500 flights

Diversion Rate

0.5%

7 of 1,500 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

BHM - Birmingham

Full on-time, delay-cause, and seasonal performance for Birmingham, AL.

BHM on-time profile

Compare the two airports

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

Compare IAH vs BHM

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: Birmingham · fleet on-time rank #1943 of 4927.

What the Data Says About IAH to BHM

Bureau of Transportation Statistics records show Houston to Birmingham (IAH to BHM) running a 83% on-time rate over 2,876 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 72.5 minutes. The 562-mile corridor is served by 11 carriers, and over the last 24 months 1.9% of 1,500 flights were cancelled, 0.5% diverted.

The monthly split is wide on this route: Nov 2023 posted the strongest performance at 87% on-time, while Jul 2021 came in at just 46% - a 41-point swing worth factoring into travel timing.

On the multi-year calendar, IAH–BHM peaks in April at 91.6% on-time while January carries the heaviest traffic (~96 flights per month) ; the softest month is July at 60.9%, a 30.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does IAH to BHM rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, IAH to BHM ranks #3356 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 BHM? ▼
Flights from Houston to Birmingham have a 83% on-time rate based on 2,876 flights. The average delay is 72.5 minutes. The best recent month was Nov 2023 with 87% on-time.
What is the cancellation rate for IAH to BHM? ▼
Over the last 24 months, 1.9% of flights on this route were cancelled (28 of 1,500 flights) and 0.5% were diverted.
How far is the flight from IAH to BHM? ▼
The flight distance from Houston (IAH) to Birmingham (BHM) is approximately 562 miles. This route is served by 11 carriers.
When is the best time to fly from IAH to BHM? ▼
The best recent month for on-time performance was Nov 2023 (87% on-time). The worst was Jul 2021 (46% on-time). Consider booking during months with historically better performance.

Airports on this route

IAH Airport

Houston
BHM Airport

Birmingham
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–BHM data

IAH–BHM runs 4 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare IAH and BHM airport profiles: delay causes and top routes differ even on the same corridor. IAH airport
  • If your dates flex, April (91.6% on-time) beats July (60.9%) on this corridor. Seasonal chart
  • 4 other routes post a similar 83% 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.