Route guide

Houston to Greenville (IAH-GSP): Nonstop Upgrade & Award Space

United Airlines flies the IAH to GSP nonstop about 13 times a week. That's enough service to give you a real choice of departures, though premium seats don't sit unclaimed for long. 2LNR watches every IAH to GSP departure for confirmed upgrade and award space and can alert you when a date you're tracking opens up.

Data current as of July 21, 2026, refreshed on an ongoing basis as new schedules and seats are confirmed.

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13
Nonstop flights a week
836 mi
Nonstop distance
Free
To get started

Confirmed upgrade & award space on every IAH to GSP departure

2LNR tracks confirmed upgrade and award availability on American, Delta, and Alaska and across 30 airlines, segment by segment, date by date. Open the calendar for Houston to Greenville to see which departures have real space, or watch the route and get alerted when space opens.

See real availability

Confirmed upgrade and award seats on each IAH to GSP departure, checked against live inventory so you know what is open before you book.

Set an alert

Premium inventory turns over fast. Watch this route and 2LNR notifies you when space appears on a date you are tracking.

Plan on the map

See IAH to GSP on the interactive route map, with schedules, connections, and route statistics.

Airlines flying Houston to Greenville nonstop

Carriers operating IAH to GSP nonstop in the current schedule. 2LNR tracks confirmed upgrade and award space on each of them.

  • United Airlines
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Frequently asked questions about IAH to GSP

How far is Greenville from Houston?
IAH to GSP covers about 836 miles nonstop. Flight times vary by aircraft and season; each scheduled departure on this page lists its own times.
Which airlines fly nonstop from IAH to GSP?
United Airlines is currently the only airline flying IAH to GSP nonstop. 2LNR tracks confirmed upgrade and award space on every United Airlines departure.
How many flights a week are there from IAH to GSP?
About 13 nonstop flights a week run between Houston and Greenville in the current schedule, operated by United Airlines. Frequency shifts by season; the calendar on this page reflects what's currently scheduled.
How do I check upgrade or award availability on IAH to GSP?
Open the IAH to GSP calendar on this page to see confirmed upgrade and award space by date. You can also set an alert on the Houston to Greenville route, and 2LNR will notify you when space opens. It's free to start.

Never miss IAH to GSP upgrade or award space

Track confirmed availability, set alerts, and book with confidence. Free to start, no credit card required.

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