Route · IAH → CHS · 2020–2025 BTS data
Houston to Charleston
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), IAH to CHS (Houston to Charleston) ranks #3717 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 79.8%
- On-time
- +0.8 pts
- vs US avg
- 65 min
- Delay when late
- 2,188
- Flights
- #3717 of 4927
- Corpus placement
Cancelled
2.1%
Best Month
Apr 2022 87%
Worst Month
Jul 2024 49%
Distance
925 mi
Carriers
10
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Jul 2025 | 30 | 21 | 1 | 0 | UA |
| Oct 2024 | 31 | 7 | 0 | 0 | UA |
| Aug 2024 | 44 | 19 | 2 | 0 | UA |
| Jul 2024 | 61 | 31 | 3 | 0 | OO,UA |
| Mar 2024 | 36 | 10 | 0 | 0 | UA |
| Jan 2024 | 30 | 9 | 4 | 0 | UA |
| Dec 2023 | 49 | 7 | 0 | 0 | OO,UA |
| Nov 2023 | 59 | 9 | 0 | 0 | OO,UA |
| Aug 2023 | 31 | 5 | 1 | 1 | UA |
| Jul 2023 | 31 | 10 | 1 | 1 | UA |
| Jun 2023 | 30 | 7 | 1 | 0 | UA |
| May 2023 | 31 | 5 | 2 | 0 | UA |
| Mar 2023 | 30 | 8 | 0 | 0 | UA |
| Jan 2023 | 31 | 3 | 0 | 0 | UA |
| Dec 2022 | 31 | 5 | 0 | 0 | YV,UA |
| Nov 2022 | 30 | 5 | 0 | 0 | YV |
| Oct 2022 | 31 | 2 | 0 | 0 | OO,YV |
| Sep 2022 | 30 | 2 | 2 | 0 | YV |
| Aug 2022 | 30 | 4 | 1 | 1 | YV |
| Jul 2022 | 31 | 4 | 0 | 0 | YV |
| Jun 2022 | 32 | 11 | 0 | 0 | OO,YV |
| May 2022 | 62 | 13 | 1 | 0 | OO,YV |
| Apr 2022 | 60 | 8 | 0 | 0 | YV |
| Mar 2022 | 36 | 9 | 0 | 0 | OO,YV |
IAH–CHS seasonal on-time pattern
Best: April (91.9%) · weakest: July (58.3%)
Strongest calendar month
April
91.9% on-time · ~75 flights/mo
Busiest calendar month
April
~75 flights/mo avg
Weakest calendar month
July
58.3% on-time · ~46 flights/mo
Cancellation Rate
2.1%
19 of 897 flights
Diversion Rate
0.3%
3 of 897 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 profileCHS - Charleston
Full on-time, delay-cause, and seasonal performance for Charleston, SC.
CHS on-time profileCompare the two airports
See IAH and CHS side by side on delays, cancellations, and reliability.
Compare IAH vs CHSOrigin-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: Charleston · fleet on-time rank #3224 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to IAH–CHS.
Routes with a similar on-time rate
What the Data Says About IAH to CHS
2,188 tracked flights put the IAH to CHS pairing (Houston to Charleston) at a 79.8% on-time rate, squarely in line with the wider network. Delays that do occur run 65.1 minutes on average. Across the 925-mile route and its 10 carriers, the trailing 24 months show 2.1% cancelled and 0.3% diverted (897 flights sampled).
The monthly split is wide on this route: Apr 2022 posted the strongest performance at 87% on-time, while Jul 2024 came in at just 49% - a 38-point swing worth factoring into travel timing.
On the multi-year calendar, IAH–CHS peaks in April at 91.9% on-time ; the softest month is July at 58.3%, a 33.6-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does IAH to CHS rank among US routes by traffic? ▼
How often are flights delayed from IAH to CHS? ▼
What is the cancellation rate for IAH to CHS? ▼
How far is the flight from IAH to CHS? ▼
When is the best time to fly from IAH to CHS? ▼
Airports on this route
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–CHS data
IAH–CHS is mid-pack at 79.8% on-time; month and carrier mix move more than the corridor headline.
- Compare IAH and CHS airport profiles: delay causes and top routes differ even on the same corridor. IAH airport
- If your dates flex, April (91.9% on-time) beats July (58.3%) on this corridor. Seasonal chart
- 4 other routes post a similar 79.8% 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.
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.