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 11 am and 42% of the time at 8 pm.

Nonstops


United	IAH	ORD	2h 48m	79%	0.7%	4,048	Flying now
American	IAH	ORD	2h 48m	71%	3.0%	1,537	Flying now
Frontier	IAH	ORD	2h 50m	66%	4.2%	262	Flying now
Spirit	IAH	ORD	2h 40m	64%	4.8%	272	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Chicago on time. Total trip = scheduled departure to arrival, layover included. Layovers up to 4 hours. Pick a connection for the details.


United Details →	IAH 05:15 → DEN 06:47UA 1874	53m Denver	DEN 07:40 → ORD 11:23UA 1928	6h 08m	95%	88%
United Details →	IAH 07:25 → TPA 10:45UA 1353	1h 45m Tampa	TPA 12:30 → ORD 14:40UA 2223	7h 15m	98%	83%
United Details →	IAH 07:35 → FLL 11:22UA 2261	1h 04m Fort Lauderdale	FLL 12:26 → ORD 14:55UA 1755	7h 20m	95%	82%
Delta Details →	IAH 05:20 → DTW 09:11DL 1389	1h 04m Detroit	DTW 10:15 → ORD 10:50DL 3673 · flown by SkyWest	5h 30m	93%	82%
United Details →	IAH 07:20 → LAS 08:35UA 1264	1h 50m Las Vegas	LAS 10:25 → ORD 16:21UA 1583	9h 01m	99%	81%
American Details →	IAH 06:01 → CLT 09:43AA 2011	1h 18m Charlotte	CLT 11:01 → ORD 12:19AA 2908	6h 18m	94%	81%
United Details →	IAH 06:30 → DEN 08:02UA 2643	3h 13m Denver	DEN 11:15 → ORD 14:55UA 2865	8h 25m	100%	81%
United Details →	IAH 20:05 → LAS 21:23UA 1360	2h 07m Las Vegas	LAS 23:30 → ORD 05:11 +1UA 2102	9h 06m	87%	80%
Tight connection: often missed
United Details →	IAH 09:56 → COS 11:25UA 6122 · flown by Mesa	46m Colorado Springs	COS 12:11 → ORD 15:56UA 1398	6h 00m	75%	57%
American Details →	IAH 08:31 → PHX 09:24AA 1937	51m Phoenix	PHX 10:15 → ORD 16:12AA 2252	7h 41m	69%	52%
United Details →	IAH 09:50 → ASE 11:40UA 5814 · flown by SkyWest	59m Aspen	ASE 12:39 → ORD 16:45UA 5956 · flown by SkyWest	6h 55m	71%	49%

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

DEN · 1h 13m · leaves 05:15 3%

FLL · 1h 04m · leaves 07:35 5%

STL · 1h 18m · leaves 08:00 6%

Afternoon and evening

DEN · 51m · leaves 18:19 42%

ATL · 1h 10m · leaves 14:40 42%

PHL · 51m · leaves 12:21 69%

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 491 IAH 07:30 → MSY American AA 4748 MSY 12:35 → ORD Connection details →	3h 49m	7h 51m	100%	86%
American AA 2551 IAH 05:02 → DFW United UA 1114 DFW 09:45 → ORD Connection details →	3h 26m	7h 24m	96%	84%
United UA 2469 IAH 08:00 → MSP American AA 3432 MSP 13:57 → ORD Connection details →	3h 04m	7h 42m	100%	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