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, one ticket

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.


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%
Delta Details →	GSP 08:52 → ATL 09:57DL 1619	2h 33m Atlanta	ATL 12:30 → IAH 13:38DL 1572	5h 46m	98%	82%
Delta Details →	GSP 05:44 → ATL 06:45DL 3028	3h 20m Atlanta	ATL 10:05 → IAH 11:18DL 1682	6h 34m	99%	79%
United Details →	GSP 10:45 → ORD 11:59UA 5361 · flown by SkyWest	2h 16m Chicago	ORD 14:15 → IAH 17:20UA 2451	7h 35m	98%	77%
American Details →	GSP 07:56 → PHL 09:47AA 5130 · flown by PSA	3h 15m Philadelphia	PHL 13:02 → IAH 15:47AA 1925	8h 51m	97%	75%
United Details →	GSP 16:15 → DEN 17:55UA 1866	2h 33m Denver	DEN 20:28 → IAH 23:59UA 2419	8h 44m	91%	73%
Delta Details →	GSP 07:10 → DTW 09:00DL 876	3h 30m Detroit	DTW 12:30 → IAH 14:30DL 1864	8h 20m	100%	71%
United Details →	GSP 06:30 → EWR 08:35UA 3700 · flown by Republic	2h 18m Newark	EWR 10:53 → IAH 13:38UA 556	8h 08m	97%	70%
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.


American AA 5654 GSP 07:00 → CLT United UA 6236 CLT 11:48 → IAH Connection details →	3h 32m	7h 34m	96%	86%
Delta DL 1146 GSP 06:45 → ATL United UA 425 ATL 11:37 → IAH Connection details →	3h 48m	7h 02m	97%	85%
American AA 3564 GSP 08:14 → ORD United UA 1448 ORD 12:40 → IAH Connection details →	3h 09m	8h 26m	100%	85%

Rank all connections, any airlines →

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