Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: United’s GSP → IAH flights land within a few points of 87% on time whatever the hour.

Nonstops (seasonal or thin)


United	GSP	IAH	2h 54m	87%	1.2%	671	Flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Houston on time. Total trip = scheduled departure to arrival, layover included (Houston is 1 h behind Greenville). Layovers up to 4 hours. Pick a connection for the details.


American + Unitedtwo ticketsDetails →	GSP 07:00 → CLT 08:16AA 5654 · flown by PSA	3h 32m Charlotte	CLT 11:48 → IAH 13:34UA 6236 · flown by Mesa	7h 34m	96%	86%
Delta + Unitedtwo ticketsDetails →	GSP 06:45 → ATL 07:49DL 1146	3h 48m Atlanta	ATL 11:37 → IAH 12:47UA 425	7h 02m	97%	85%
American + Unitedtwo ticketsDetails →	GSP 08:14 → ORD 09:31AA 3564 · flown by Envoy	3h 09m Chicago	ORD 12:40 → IAH 15:40UA 1448	8h 26m	100%	85%
Southwest + Unitedtwo ticketsDetails →	GSP 08:25 → BWI 09:50WN 1899	3h 05m Baltimore	BWI 12:55 → IAH 15:11UA 743	7h 46m	100%	85%
United Details →	GSP 06:10 → ORD 07:30UA 4728 · flown by SkyWest	2h 55m Chicago	ORD 10:25 → IAH 13:23UA 2638	8h 13m	97%	84%
American + Unitedtwo ticketsDetails →	GSP 07:56 → PHL 09:47AA 5130 · flown by PSA	3h 17m Philadelphia	PHL 13:04 → IAH 15:35UA 2038	8h 39m	96%	83%
Delta + Unitedtwo ticketsDetails →	GSP 07:10 → DTW 09:00DL 876	1h 55m Detroit	DTW 10:55 → IAH 12:57UA 6251 · flown by Mesa	6h 47m	98%	82%
Delta Details →	GSP 08:52 → ATL 09:57DL 1619	2h 33m Atlanta	ATL 12:30 → IAH 13:38DL 1572	5h 46m	98%	82%
Tight connection: often missed
Delta Details →	GSP 15:31 → LGA 17:35DL 5463 · flown by Endeavor	54m New York	LGA 18:29 → IAH 21:44DL 2109	7h 13m	65%	38%
United Details →	GSP 17:43 → ORD 19:00UA 5524 · flown by SkyWest	1h 02m Chicago	ORD 20:02 → IAH 22:59UA 2813	6h 16m	64%	33%
American Details →	GSP 18:43 → ORD 20:14AA 3559 · flown by Envoy	53m Chicago	ORD 21:07 → IAH 23:51AA 3144	6h 08m	61%	28%

Same layover, different day-part

How often the first flight arrives too late to connect (45 min minimum), for one-ticket layovers of 45–80 minutes.

Morning

DFW · 51m · leaves 07:01 30%

Afternoon and evening

LGA · 54m · leaves 15:31 35%

DFW · 1h 03m · leaves 20:00 37%

ORD · 53m · leaves 18:43 39%

Delays build through the day, so an afternoon first leg eats the layover. A short connection is fine early in the morning and a gamble later on.

Mixing airlines

One ticketMiss it and the airline rebooks you; bags go through. 45 min is enough.

Separate ticketsMiss it and you buy a new ticket. Re-check bags, clear security again: we require 90 min.

The table above includes two-ticket connections (marked “two tickets”), held to the 90-minute minimum. One ticket only →

Regional partners count as the airline that sells them: SkyWest flying Delta Connection is one Delta ticket.

How these are worked out. Makes the connection: share of the last year’s flights where the first flight arrived with at least 45 minutes to spare (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled and arriving within 15 minutes. Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON