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 IAH → CHS flights land within a few points of 4 in 5 on time whatever the hour.

Nonstops (seasonal or thin)


United	IAH	CHS	2h 38m	79%	0.4%	688	Flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

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


United Details →	IAH 05:04 → ORD 07:59UA 1044	2h 36m Chicago	ORD 10:35 → CHS 14:06UA 3646 · flown by Republic	8h 02m	100%	92%
Delta Details →	IAH 05:40 → ATL 08:43DL 1069	2h 03m Atlanta	ATL 10:46 → CHS 12:00DL 3107	5h 20m	99%	88%
United Details →	IAH 05:15 → DEN 06:47UA 1874	3h 03m Denver	DEN 09:50 → CHS 15:14UA 1003	8h 59m	99%	84%
United Details →	IAH 07:20 → IAD 11:28UA 1549	1h 07m Dulles	IAD 12:35 → CHS 14:27UA 3487 · flown by Republic	6h 07m	94%	84%
Delta Details →	IAH 07:02 → ATL 10:05DL 1315	2h 24m Atlanta	ATL 12:29 → CHS 13:41DL 2179	5h 39m	98%	81%
Delta Details →	IAH 08:05 → ATL 11:09DL 644	3h 33m Atlanta	ATL 14:42 → CHS 15:58DL 1381	6h 53m	100%	81%
United Details →	IAH 06:01 → EWR 10:36UA 1797	1h 34m Newark	EWR 12:10 → CHS 14:16UA 1760	7h 15m	98%	77%
Delta Details →	IAH 09:42 → ATL 12:48DL 1585	3h 11m Atlanta	ATL 15:59 → CHS 17:18DL 2174	6h 34m	99%	77%
Tight connection: often missed
United Details →	IAH 14:30 → ORD 17:22UA 699	1h 03m Chicago	ORD 18:25 → CHS 21:48UA 2362	6h 18m	68%	42%
American Details →	IAH 16:27 → PHL 20:55AA 1925	1h 00m Philadelphia	PHL 21:55 → CHS 23:56AA 5068 · flown by PSA	6h 29m	70%	35%
American Details →	IAH 16:18 → DFW 17:48AA 3583 · flown by Envoy	1h 29m Dallas-Fort Worth	DFW 19:17 → CHS 22:55AA 2559	5h 37m	74%	32%

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

IAD · 1h 07m · leaves 07:20 6%

ATL · 1h 20m · leaves 08:05 7%

MSP · 1h 12m · leaves 06:30 8%

Afternoon and evening

DTW · 1h 16m · leaves 15:27 12%

ATL · 1h 16m · leaves 18:34 20%

PHL · 1h 00m · leaves 16:27 30%

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