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

Connect in the morning. The same one-hour layover misses 7% of the time at 9 am and 38% of the time at 6 pm.

Nonstops


United	IAH	RDU	2h 47m	86%	0.9%	1,037	Flying now
Frontier	IAH	RDU	2h 56m	78%	2.2%	227	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Delta Details →	IAH 05:40 → ATL 08:43DL 1069	2h 31m Atlanta	ATL 11:14 → RDU 12:44DL 1488	6h 04m	99%	87%
United Details →	IAH 06:30 → DEN 08:02UA 2643	1h 47m Denver	DEN 09:49 → RDU 15:16UA 2269	7h 46m	98%	87%
United Details →	IAH 05:04 → ORD 07:59UA 1044	1h 11m Chicago	ORD 09:10 → RDU 12:33UA 5326 · flown by SkyWest	6h 29m	99%	85%
Delta Details →	IAH 07:02 → ATL 10:05DL 1315	2h 57m Atlanta	ATL 13:02 → RDU 14:29DL 2026	6h 27m	98%	84%
Delta Details →	IAH 08:05 → ATL 11:09DL 644	3h 36m Atlanta	ATL 14:45 → RDU 16:14DL 1550	7h 09m	100%	82%
United Details →	IAH 06:10 → ORD 09:05UA 2616	1h 43m Chicago	ORD 10:48 → RDU 14:01UA 2616	6h 51m	98%	81%
Delta Details →	IAH 05:20 → DTW 09:11DL 1389	1h 04m Detroit	DTW 10:15 → RDU 11:57DL 2164	5h 40m	93%	80%
American Details →	IAH 06:01 → CLT 09:43AA 2011	1h 21m Charlotte	CLT 11:04 → RDU 12:02AA 2363	5h 01m	94%	80%
Tight connection: often missed
United Details →	IAH 14:30 → ORD 17:22UA 699	1h 03m Chicago	ORD 18:25 → RDU 21:37UA 1989	6h 07m	68%	35%
Delta Details →	IAH 14:10 → LGA 18:56DL 2088	54m New York	LGA 19:50 → RDU 21:57DL 5442 · flown by Endeavor	6h 47m	71%	28%
United Details →	IAH 13:46 → EWR 18:30UA 1397	50m Newark	EWR 19:20 → RDU 21:10UA 1233	6h 24m	62%	23%

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

ORD · 1h 11m · leaves 05:04 1%

DTW · 1h 04m · leaves 05:20 7%

ATL · 1h 09m · leaves 07:02 9%

Afternoon and evening

LGA · 54m · leaves 14:10 29%

ATL · 1h 12m · leaves 16:51 34%

EWR · 50m · leaves 13:46 38%

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.


United UA 1030 IAH 07:20 → ATL Delta DL 2026 ATL 13:02 → RDU Connection details →	2h 23m	6h 09m	97%	85%
United UA 2174 IAH 07:40 → BNA American AA 4639 BNA 12:00 → RDU Connection details →	2h 13m	6h 03m	96%	84%
United UA 6312 IAH 07:30 → CVG Delta DL 5400 CVG 13:31 → RDU Connection details →	2h 32m	6h 32m	98%	80%

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