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 5% of the time at 9 am and almost half the time at 8 pm.

Nonstops


United	IAH	DEN	2h 40m	83%	0.3%	3,899	Flying now
Frontier	IAH	DEN	2h 49m	80%	1.0%	816	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	IAH 05:04 → ORD 07:59UA 1044	2h 55m Chicago	ORD 10:54 → DEN 12:45UA 581	8h 41m	100%	97%
United Details →	IAH 07:20 → MCO 10:51UA 2245	1h 59m Orlando	MCO 12:50 → DEN 14:51UA 1520	8h 31m	99%	92%
United Details →	IAH 07:35 → AUS 08:39UA 2016	2h 48m Austin	AUS 11:27 → DEN 12:45UA 779	6h 10m	100%	91%
United Details →	IAH 08:00 → MCI 10:03UA 2266	1h 30m Kansas City	MCI 11:33 → DEN 12:38UA 5358 · flown by SkyWest	5h 38m	97%	91%
United Details →	IAH 06:00 → LAX 07:29UA 2110	1h 18m Los Angeles	LAX 08:47 → DEN 12:13UA 1912	7h 13m	100%	91%
United Details →	IAH 14:54 → LAX 16:27UA 1951	2h 18m Los Angeles	LAX 18:45 → DEN 22:15UA 2610	8h 21m	100%	91%
United Details →	IAH 10:15 → AUS 11:19UA 1823	1h 36m Austin	AUS 12:55 → DEN 14:14UA 1541	4h 59m	94%	90%
United Details →	IAH 07:20 → LAX 08:57UA 2600	1h 58m Los Angeles	LAX 10:55 → DEN 14:27UA 2061	8h 07m	99%	90%
Tight connection: often missed
Delta Details →	IAH 10:52 → MSP 13:41DL 2656	46m Minneapolis	MSP 14:27 → DEN 15:38DL 1025	5h 46m	71%	56%
United Details →	IAH 18:05 → SFO 20:10UA 1341	50m San Francisco	SFO 21:00 → DEN 00:47 +1UA 301	7h 42m	52%	44%
American Details →	IAH 11:26 → ORD 14:17AA 1909	58m Chicago	ORD 15:15 → DEN 17:00AA 1734	6h 34m	62%	39%

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

SFO · 1h 09m · leaves 05:22 2%

IAD · 1h 20m · leaves 07:20 3%

ATL · 1h 07m · leaves 05:40 4%

Afternoon and evening

DFW · 59m · leaves 16:20 30%

SHV · 46m · leaves 14:28 38%

SFO · 50m · leaves 18:05 48%

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 2751 IAH 16:20 → SAN Alaska AS 1619 SAN 20:01 → DEN Connection details →	2h 20m	8h 10m	94%	91%
Delta DL 1216 IAH 07:10 → LAX United UA 2061 LAX 10:55 → DEN Connection details →	2h 16m	8h 17m	98%	88%
Delta DL 1583 IAH 07:35 → SLC United UA 4720 SLC 13:05 → DEN Connection details →	3h 14m	8h 16m	96%	88%

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