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 8% of the time at 8 am and 2 times in 5 at 7 pm.

Nonstops


United	ATL	IAH	2h 27m	84%	0.7%	1,630	Flying now
Delta	ATL	IAH	2h 13m	76%	1.9%	2,521	Flying now
Frontier	ATL	IAH	2h 22m	71%	1.9%	798	Flying now
Spirit	ATL	IAH	2h 18m	66%	5.0%	342	Not 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 Atlanta). Layovers up to 4 hours. Pick a connection for the details.


United Details →	ATL 05:30 → IAD 07:20UA 641	1h 20m Dulles	IAD 08:40 → IAH 10:59UA 1524	6h 29m	98%	85%
United Details →	ATL 09:25 → IAD 11:15UA 632	1h 35m Dulles	IAD 12:50 → IAH 15:11UA 1535	6h 46m	97%	80%
Delta Details →	ATL 10:05 → SLC 12:10DL 387	1h 35m Salt Lake City	SLC 13:45 → IAH 17:53DL 1299	8h 48m	98%	78%
American Details →	ATL 05:00 → CLT 06:25AA 5507 · flown by PSA	1h 17m Charlotte	CLT 07:42 → IAH 09:25AA 1930	5h 25m	88%	78%
United Details →	ATL 09:26 → EWR 11:44UA 1705	2h 28m Newark	EWR 14:12 → IAH 17:10UA 2690	8h 44m	100%	78%
Delta Details →	ATL 15:28 → DTW 17:28DL 1005	2h 57m Detroit	DTW 20:25 → IAH 22:24DL 1633	7h 56m	98%	78%
Delta Details →	ATL 13:55 → SLC 15:51DL 423	1h 54m Salt Lake City	SLC 17:45 → IAH 21:52DL 2514	8h 57m	98%	77%
United Details →	ATL 11:10 → DEN 12:28UA 1327	3h 07m Denver	DEN 15:35 → IAH 19:10UA 489	9h 00m	98%	77%
Tight connection: often missed
United Details →	ATL 15:30 → ORD 16:57UA 516	48m Chicago	ORD 17:45 → IAH 20:50UA 1954	6h 20m	62%	47%
Frontier Details →	ATL 13:38 → BWI 15:34F9 2634	1h 10m Baltimore	BWI 16:44 → IAH 19:07F9 3067	6h 34m	66%	37%
American Details →	ATL 19:00 → MIA 21:00AA 1367	1h 15m Miami	MIA 22:15 → IAH 23:59AA 2230	5h 59m	46%	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 20m · leaves 05:30 2%

LGA · 1h 12m · leaves 07:30 6%

DEN · 1h 16m · leaves 07:30 6%

Afternoon and evening

EWR · 51m · leaves 16:25 40%

MIA · 1h 15m · leaves 19:00 54%

DFW · 47m · leaves 16:16 62%

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.


Delta DL 1380 ATL 07:30 → PIT United UA 1964 PIT 13:05 → IAH Connection details →	3h 54m	8h 38m	100%	96%
Southwest WN 212 ATL 07:40 → MCO United UA 1493 MCO 11:57 → IAH Connection details →	2h 47m	6h 49m	97%	92%
Delta DL 2545 ATL 13:36 → CLE United UA 1645 CLE 18:41 → IAH Connection details →	3h 18m	8h 19m	99%	90%

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