Route · IAH → GSP · 2020–2025 BTS data
Houston to Greer
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), IAH to GSP (Houston to Greer) ranks #3859 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 79.6%
- On-time
- +0.6 pts
- vs US avg
- 76 min
- Delay when late
- 1,952
- Flights
- #3859 of 4927
- Corpus placement
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 |
IAH–GSP seasonal on-time pattern
Best: November (86.9%) · weakest: July (69.7%)
Strongest calendar month
November
86.9% on-time · ~31 flights/mo
Busiest calendar month
February
~45 flights/mo avg
Weakest calendar month
July
69.7% on-time · ~40 flights/mo
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.
IAH on-time profileGSP - Greer
Full on-time, delay-cause, and seasonal performance for Greer, SC.
GSP on-time profileCompare the two airports
See IAH and GSP side by side on delays, cancellations, and reliability.
Compare IAH vs GSPOrigin-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: Greer · fleet on-time rank #3306 of 4927.
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.
On the multi-year calendar, IAH–GSP peaks in November at 86.9% on-time while February carries the heaviest traffic (~45 flights per month) ; the softest month is July at 69.7%, a 17.2-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does IAH to GSP rank among US routes by traffic? ▼
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? ▼
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–GSP data
IAH–GSP is mid-pack at 79.6% on-time; month and carrier mix move more than the corridor headline.
- Compare IAH and GSP airport profiles: delay causes and top routes differ even on the same corridor. IAH airport
- If your dates flex, November (86.9% on-time) beats July (69.7%) on this corridor. Seasonal chart
- 4 other routes post a similar 79.6% 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.