Route · GSP → IAH · 2020–2025 BTS data
Greer to Houston
The GSP–IAH corridor (Greer, SC → Houston, TX) runs ahead of the national average, served by 8 carriers across roughly 837 miles.
Data updated 2026-06-13
- 87.9%
- On-time
- +8.9 pts
- vs US avg
- 104 min
- Delay when late
- 1,861
- Flights
Cancelled
1.6%
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 | 5 | 0 | 0 | UA |
| Mar 2025 | 31 | 4 | 0 | 0 | UA |
| Jan 2025 | 31 | 7 | 1 | 0 | UA |
| Dec 2024 | 32 | 5 | 1 | 0 | UA |
| Nov 2024 | 30 | 3 | 0 | 0 | UA |
| Oct 2024 | 31 | 9 | 0 | 0 | UA |
| Aug 2024 | 43 | 4 | 0 | 0 | OO,UA |
| Jul 2024 | 46 | 11 | 6 | 0 | OO,UA |
| Jun 2024 | 33 | 5 | 0 | 0 | OO,UA |
| May 2024 | 31 | 8 | 1 | 0 | UA |
| Apr 2024 | 30 | 3 | 0 | 0 | UA |
| Mar 2024 | 31 | 2 | 0 | 0 | UA |
| Jan 2024 | 31 | 3 | 0 | 0 | UA |
| Dec 2023 | 31 | 6 | 0 | 0 | UA |
| Nov 2023 | 30 | 5 | 0 | 0 | UA |
| Oct 2023 | 31 | 2 | 0 | 0 | UA |
| Sep 2023 | 30 | 1 | 0 | 0 | UA |
| Aug 2023 | 31 | 0 | 0 | 0 | UA |
| Jul 2023 | 31 | 4 | 1 | 0 | UA |
| Jun 2023 | 30 | 6 | 1 | 0 | UA |
| May 2023 | 31 | 5 | 1 | 1 | UA |
| Apr 2023 | 30 | 4 | 0 | 0 | UA |
| Dec 2022 | 30 | 5 | 0 | 0 | YV,OO |
| Nov 2022 | 30 | 7 | 0 | 0 | OO,YV |
Cancellation Rate
1.6%
12 of 765 flights
Diversion Rate
0.1%
1 of 765 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
GSP - Greer
Full on-time, delay-cause, and seasonal performance for Greer, SC.
Origin airport →IAH - Houston
Full on-time, delay-cause, and seasonal performance for Houston, TX.
Destination airport →Compare the two airports
See GSP and IAH side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to GSP–IAH.
Routes with a similar on-time rate
What the Data Says About GSP to IAH
Greer to Houston (GSP to IAH) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 87.9% on-time rate across 1,861 flights, with delays that do happen averaging 104.3 minutes. The corridor runs roughly 837 miles and is served by 8 carriers. Over the most recent 24 months, 12 of 765 flights were cancelled (1.6%) and 1 diverted (0.1%).
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
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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.