Route · GSP → IAH · 2020–2025 BTS data
Greer to Houston
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), GSP to IAH (Greer to Houston) ranks #3906 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 87.9%
- On-time
- +8.9 pts
- vs US avg
- 104 min
- Delay when late
- 1,861
- Flights
- #3906 of 4927
- Corpus placement
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 |
GSP–IAH seasonal on-time pattern
Best: September (94.2%) · weakest: June (82.6%)
Strongest calendar month
September
94.2% on-time · ~40 flights/mo
Busiest calendar month
February
~45 flights/mo avg
Weakest calendar month
June
82.6% on-time · ~37 flights/mo
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.
GSP on-time profileIAH - Houston
Full on-time, delay-cause, and seasonal performance for Houston, TX.
IAH on-time profileCompare the two airports
See GSP and IAH side by side on delays, cancellations, and reliability.
Compare GSP vs IAHOrigin-hub reliability standing
Among GSP's stronger departures
GSP → IAH posts a 87.9% on-time rate, landing in the ≥85% band with 9 of 14 BTS-tracked routes leaving Greer. The same hub also shows 5 mid-band and 0 challenged departures · fleet-wide on-time rank #433 of 4927 (highest on-time = #1).
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.
On the multi-year calendar, GSP–IAH peaks in September at 94.2% on-time while February carries the heaviest traffic (~45 flights per month) ; the softest month is June at 82.6%, a 11.6-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does GSP to IAH rank among US routes by traffic? ▼
How often are flights delayed from GSP to IAH? ▼
What is the cancellation rate for GSP to IAH? ▼
How far is the flight from GSP to IAH? ▼
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 GSP–IAH data
GSP–IAH runs 8.9 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare GSP and IAH airport profiles: delay causes and top routes differ even on the same corridor. GSP airport
- If your dates flex, September (94.2% on-time) beats June (82.6%) on this corridor. Seasonal chart
- 4 other routes post a similar 87.9% 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.