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

No clear winner: airlines and hours on this route all land within a few points of 4 in 5 on time.

Nonstops


United	IAH	MIA	2h 38m	82%	0.2%	1,469	Flying now
American	IAH	MIA	2h 38m	78%	1.2%	1,688	Flying now
Frontier	IAH	MIA	2h 54m	68%	4.0%	175	Flying now
Spirit	IAH	MIA	2h 33m	70%	3.2%	380	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Delta Details →	IAH 19:01 → SLC 21:15DL 1299	1h 45m Salt Lake City	SLC 23:00 → MIA 05:42 +1DL 2040	9h 41m	93%	84%
American Details →	IAH 06:01 → CLT 09:43AA 2011	1h 18m Charlotte	CLT 11:01 → MIA 13:11AA 969	6h 09m	94%	79%
Delta Details →	IAH 05:40 → ATL 08:43DL 1069	2h 17m Atlanta	ATL 11:00 → MIA 13:04DL 1332	6h 24m	99%	78%
United Details →	IAH 05:04 → ORD 07:59UA 1044	2h 34m Chicago	ORD 10:33 → MIA 14:57UA 1620	8h 53m	100%	76%
Delta Details →	IAH 07:02 → ATL 10:05DL 1315	2h 49m Atlanta	ATL 12:54 → MIA 14:55DL 1579	6h 53m	98%	72%
United Details →	IAH 06:01 → EWR 10:36UA 1797	55m Newark	EWR 11:31 → MIA 14:38UA 2295	7h 37m	92%	72%
Frontier Details →	IAH 06:10 → ATL 09:41F9 1404	2h 06m Atlanta	ATL 11:47 → MIA 13:53F9 4406	6h 39m	96%	69%
American Details →	IAH 06:13 → ORD 09:07AA 3106	57m Chicago	ORD 10:04 → MIA 14:16AA 1474	7h 04m	87%	68%
Tight connection: often missed
American Details →	IAH 16:27 → PHL 20:55AA 1925	1h 00m Philadelphia	PHL 21:55 → MIA 00:52 +1AA 2936	7h 25m	70%	38%
American Details →	IAH 15:06 → CLT 18:51AA 1919	1h 24m Charlotte	CLT 20:15 → MIA 22:21AA 2321	6h 15m	71%	35%
American Details →	IAH 13:36 → ORD 16:35AA 1915	1h 25m Chicago	ORD 18:00 → MIA 22:17AA 2690	7h 41m	68%	29%

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

CLT · 1h 18m · leaves 06:01 6%

EWR · 55m · leaves 06:01 8%

DEN · 1h 17m · leaves 07:20 9%

Afternoon and evening

PHL · 1h 00m · leaves 16:27 30%

ATL · 55m · leaves 18:34 30%

DFW · 1h 04m · leaves 14:04 47%

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 1043 IAH 11:32 → DTW American AA 3358 DTW 18:57 → MIA Connection details →	3h 37m	9h 38m	99%	90%
United UA 6152 IAH 12:05 → MCI American AA 3939 MCI 17:53 → MIA Connection details →	3h 38m	9h 00m	98%	81%
United UA 1044 IAH 05:04 → ORD American AA 1474 ORD 10:04 → MIA Connection details →	2h 05m	8h 13m	99%	81%

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