Route · IAH → GSP · 2020–2025 BTS data
Houston to Greer
The IAH–GSP corridor (Houston, TX → Greer, SC) runs ahead of the national average, served by 8 carriers across roughly 837 miles.
Data updated 2026-06-13
- 79.6%
- On-time
- +0.6 pts
- vs US avg
- 76 min
- Delay when late
- 1,952
- Flights
Cancelled
1.4%
Best Month
N/A
Worst Month
N/A
Distance
837 mi
Carriers
8
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Apr 2025 | 30 | 6 | 0 | 0 | UA |
| Mar 2025 | 31 | 7 | 0 | 0 | UA |
| Jan 2025 | 31 | 12 | 1 | 0 | UA |
| Dec 2024 | 32 | 8 | 1 | 0 | UA |
| Nov 2024 | 30 | 8 | 0 | 0 | UA |
| Oct 2024 | 31 | 3 | 0 | 0 | UA |
| Sep 2024 | 30 | 4 | 1 | 0 | UA |
| Aug 2024 | 42 | 15 | 0 | 0 | OO,UA |
| Jul 2024 | 46 | 23 | 4 | 0 | OO,UA |
| Jun 2024 | 33 | 16 | 1 | 0 | OO,UA |
| May 2024 | 31 | 19 | 1 | 0 | UA |
| Apr 2024 | 30 | 6 | 0 | 0 | UA |
| Mar 2024 | 31 | 7 | 0 | 0 | UA |
| Jan 2024 | 31 | 5 | 0 | 0 | UA |
| Dec 2023 | 31 | 6 | 0 | 0 | UA |
| Nov 2023 | 30 | 4 | 0 | 0 | UA |
| Oct 2023 | 31 | 6 | 0 | 0 | UA |
| Sep 2023 | 30 | 7 | 0 | 0 | UA |
| Aug 2023 | 31 | 6 | 0 | 0 | UA |
| Jul 2023 | 31 | 11 | 1 | 0 | UA |
| Jun 2023 | 30 | 15 | 0 | 0 | UA |
| May 2023 | 31 | 12 | 1 | 0 | UA |
| Apr 2023 | 30 | 9 | 0 | 0 | UA |
| Mar 2023 | 30 | 11 | 0 | 0 | UA |
Cancellation Rate
1.4%
11 of 764 flights
Diversion Rate
0.0%
0 of 764 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.
Origin airport →GSP - Greer
Full on-time, delay-cause, and seasonal performance for Greer, SC.
Destination airport →Compare the two airports
See IAH and GSP side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to IAH–GSP.
Routes with a similar on-time rate
What the Data Says About IAH to GSP
1,952 tracked flights put the IAH to GSP pairing (Houston to Greer) at a 79.6% on-time rate, squarely in line with the wider network. Delays that do occur run 75.6 minutes on average. Across the 837-mile route and its 8 carriers, the trailing 24 months show 1.4% cancelled and 0.0% diverted (764 flights sampled).
Monthly performance data for this route did not show a clear best/worst split in the sample window; review the monthly table above for period-by-period detail.
Frequently Asked Questions
How often are flights delayed from IAH to GSP? ▼
What is the cancellation rate for IAH to GSP? ▼
How far is the flight from IAH to GSP? ▼
Flight Guides
Tips and data-driven advice for choosing reliable routes.
Explore PlainFlights
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.
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.