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 14% of the time at 7 am and almost half the time at 8 pm.

Nonstops (seasonal or thin)


United	IAH	ONT	3h 26m	79%	0.0%	365	Flying now
Frontier	IAH	ONT	3h 31m	78%	0.5%	196	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Ontario on time. Total trip = scheduled departure to arrival, layover included (Ontario is 2 h behind Houston). Layovers up to 4 hours. Pick a connection for the details.


United Details →	IAH 08:30 → DEN 10:05UA 2816	1h 20m Denver	DEN 11:25 → ONT 12:47UA 430	6h 17m	100%	88%
Delta Details →	IAH 07:35 → SLC 09:51DL 1583	1h 28m Salt Lake City	SLC 11:19 → ONT 12:10DL 3172	6h 35m	93%	84%
Delta Details →	IAH 19:01 → SLC 21:15DL 1299	1h 44m Salt Lake City	SLC 22:59 → ONT 23:48DL 1614	6h 47m	93%	82%
American Details →	IAH 05:02 → DFW 06:19AA 2551	2h 01m Dallas-Fort Worth	DFW 08:20 → ONT 09:29AA 2238	6h 27m	94%	81%
United Details →	IAH 15:30 → SFO 17:35UA 589	3h 25m San Francisco	SFO 21:00 → ONT 22:37UA 552	9h 07m	98%	81%
United Details →	IAH 05:22 → SFO 07:22UA 487	3h 18m San Francisco	SFO 10:40 → ONT 12:12UA 2661	8h 50m	99%	77%
Frontier Details →	IAH 18:14 → DEN 19:58F9 3227	2h 31m Denver	DEN 22:29 → ONT 23:49F9 1261	7h 35m	97%	77%
Alaska Details →	IAH 06:02 → SEA 08:40AS 453	1h 45m Seattle	SEA 10:25 → ONT 13:09AS 565	9h 07m	99%	73%
Tight connection: often missed
United Details →	IAH 18:05 → SFO 20:10UA 1341	50m San Francisco	SFO 21:00 → ONT 22:37UA 552	6h 32m	52%	42%
American Details →	IAH 16:18 → DFW 17:48AA 3583 · flown by Envoy	1h 02m Dallas-Fort Worth	DFW 18:50 → ONT 19:59AA 2236	5h 41m	70%	41%
American Details →	IAH 18:53 → DFW 20:25AA 1929	1h 02m Dallas-Fort Worth	DFW 21:27 → ONT 22:32AA 711	5h 39m	24%	11%

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 15m · leaves 07:20 3%

DFW · 52m · leaves 06:02 14%

Afternoon and evening

SFO · 50m · leaves 18:05 48%

DFW · 1h 02m · leaves 18:53 76%

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 1874 IAH 05:15 → DEN Frontier F9 2907 DEN 08:44 → ONT Connection details →	1h 57m	6h 50m	97%	88%
United UA 756 IAH 09:45 → SLC Delta DL 4443 SLC 15:45 → ONT Connection details →	3h 46m	8h 56m	100%	87%
United UA 740 IAH 09:30 → PDX Alaska AS 2093 PDX 14:30 → ONT Connection details →	2h 34m	9h 22m	94%	87%

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