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

No clear winner: Southwest’s HOU → ONT flights land within a few points of 4 in 5 on time whatever the hour.

Nonstops (seasonal or thin)


Southwest	HOU	ONT	3h 25m	80%	0.3%	362	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.


Southwest Details →	HOU 07:35 → OAK 09:30WN 2056	1h 20m Oakland	OAK 10:50 → ONT 12:10WN 3062	6h 35m	96%	93%
Southwest Details →	HOU 06:20 → PHX 06:55WN 2062	3h 10m Phoenix	PHX 10:05 → ONT 11:20WN 431	7h 00m	98%	84%
Southwest Details →	HOU 07:50 → LAS 09:00WN 1998	2h 30m Las Vegas	LAS 11:30 → ONT 12:32WN 2298	6h 42m	98%	80%
Southwest Details →	HOU 05:30 → DEN 06:55WN 1970	55m Denver	DEN 07:50 → ONT 09:10WN 1660	5h 40m	91%	77%
Southwest Details →	HOU 19:50 → PHX 20:32WN 982	2h 23m Phoenix	PHX 22:55 → ONT 00:08 +1WN 223	6h 17m	100%	77%
Southwest Details →	HOU 07:48 → SJC 09:38WN 2079	1h 12m San Jose	SJC 10:50 → ONT 12:05WN 3151	6h 17m	88%	75%
American Details →	HOU 06:03 → DFW 07:30AA 3395 · flown by Envoy	50m Dallas-Fort Worth	DFW 08:20 → ONT 09:29AA 2238	5h 26m	82%	73%
Southwest Details →	HOU 07:35 → SMF 09:25WN 2082	2h 35m Sacramento	SMF 12:00 → ONT 13:25WN 300	7h 50m	100%	71%
Tight connection: often missed
Southwest Details →	HOU 11:00 → BNA 12:55WN 1955	1h 00m Nashville	BNA 13:55 → ONT 16:00WN 855	7h 00m	73%	37%
American Details →	HOU 16:14 → DFW 17:38AA 5002 · flown by SkyWest	1h 12m Dallas-Fort Worth	DFW 18:50 → ONT 19:59AA 2236	5h 45m	63%	37%
American Details →	HOU 18:49 → DFW 20:15AA 6385 · flown by SkyWest	1h 12m Dallas-Fort Worth	DFW 21:27 → ONT 22:32AA 711	5h 43m	65%	30%

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 10m · leaves 08:15 7%

PHX · 55m · leaves 06:20 10%

SJC · 1h 12m · leaves 07:48 12%

Afternoon and evening

DFW · 1h 12m · leaves 16:14 37%

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.


Southwest WN 1970 HOU 05:30 → DEN Frontier F9 2907 DEN 08:44 → ONT Connection details →	1h 49m	6h 35m	100%	91%
Southwest WN 2002 HOU 14:10 → LAS Frontier F9 2231 LAS 18:43 → ONT Connection details →	3h 23m	7h 41m	100%	77%
American AA 5071 HOU 10:18 → DFW Frontier F9 4689 DFW 15:35 → ONT Connection details →	3h 52m	8h 30m	95%	75%

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