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Route · CHS → IAH · 2020–2025 BTS data

Charleston to Houston

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), CHS to IAH (Charleston to Houston) ranks #3647 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

82.4%
On-time
+3.4 pts
vs US avg
75 min
Delay when late
2,279
Flights
#3647 of 4927
Corpus placement

Cancelled

2.8%

Best Month

Nov 2023 92%

Worst Month

Jul 2024 74%

Distance

925 mi

Carriers

11

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Jul 2025 30 4 1 0 UA
Oct 2024 31 3 0 1 UA
Aug 2024 44 8 2 0 UA
Jul 2024 61 16 7 0 OO,UA
Mar 2024 36 8 0 1 UA
Feb 2024 30 6 0 0 UA
Jan 2024 30 8 4 0 UA
Dec 2023 50 5 0 0 OO,UA
Nov 2023 59 5 0 0 OO,UA
Sep 2023 30 10 0 0 UA
Aug 2023 31 13 1 0 UA
Jul 2023 31 15 1 0 UA
Jun 2023 30 12 1 0 UA
May 2023 31 10 2 0 UA
Mar 2023 30 11 1 0 UA
Jan 2023 31 6 0 0 UA
Dec 2022 31 6 0 0 YV,UA
Nov 2022 30 7 0 0 YV
Oct 2022 31 2 0 0 OO,YV
Sep 2022 30 5 2 0 YV
Aug 2022 30 8 2 0 YV
Jul 2022 31 7 0 0 YV
Jun 2022 32 8 0 0 OO,YV
May 2022 62 6 0 0 OO,YV

CHS–IAH seasonal on-time pattern

Best: November (89.0%) · weakest: July (71.4%)

70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 86.5%

Strongest calendar month

November

89.0% on-time · ~45 flights/mo

Busiest calendar month

April

~75 flights/mo avg

Weakest calendar month

July

71.4% on-time · ~46 flights/mo

Cancellation Rate

2.8%

24 of 862 flights

Diversion Rate

0.2%

2 of 862 flights

Explore origin & destination

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

CHS - Charleston

Full on-time, delay-cause, and seasonal performance for Charleston, SC.

CHS 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 CHS and IAH side by side on delays, cancellations, and reliability.

Compare CHS vs IAH

Origin-hub reliability standing

Mid-pack among CHS departures

From CHS, this corridor sits with 18 other 75–85% on-time routes out of 21 tracked departures, not the hub's reliability leaders (3 at ≥85%) and not the softest ( 0 below 75%). Destination: Houston · fleet on-time rank #2177 of 4927.

What the Data Says About CHS to IAH

Bureau of Transportation Statistics records show Charleston to Houston (CHS to IAH) running a 82.4% on-time rate over 2,279 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 74.7 minutes. The 925-mile corridor is served by 11 carriers, and over the last 24 months 2.8% of 862 flights were cancelled, 0.2% diverted.

The monthly split is wide on this route: Nov 2023 posted the strongest performance at 92% on-time, while Jul 2024 came in at just 74% - a 18-point swing worth factoring into travel timing.

On the multi-year calendar, CHS–IAH peaks in November at 89.0% on-time while April carries the heaviest traffic (~75 flights per month) ; the softest month is July at 71.4%, a 17.6-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does CHS to IAH rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, CHS to IAH ranks #3647 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 CHS to IAH? ▼
Flights from Charleston to Houston have a 82.4% on-time rate based on 2,279 flights. The average delay is 74.7 minutes. The best recent month was Nov 2023 with 92% on-time.
What is the cancellation rate for CHS to IAH? ▼
Over the last 24 months, 2.8% of flights on this route were cancelled (24 of 862 flights) and 0.2% were diverted.
How far is the flight from CHS to IAH? ▼
The flight distance from Charleston (CHS) to Houston (IAH) is approximately 925 miles. This route is served by 11 carriers.
When is the best time to fly from CHS to IAH? ▼
The best recent month for on-time performance was Nov 2023 (92% on-time). The worst was Jul 2024 (74% on-time). Consider booking during months with historically better performance.

Airports on this route

CHS Airport

Charleston
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 CHS–IAH data

CHS–IAH runs 3.4 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare CHS and IAH airport profiles: delay causes and top routes differ even on the same corridor. CHS airport
  • If your dates flex, November (89.0% on-time) beats July (71.4%) on this corridor. Seasonal chart
  • 4 other routes post a similar 82.4% 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.