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

The nonstop is quickest: Southwest ONT → DAL (2h 50m), on time 3 times in 4. Southwest via Phoenix (5h 25m) is more reliable, 91%, but takes 2h 35m longer.

Nonstops (seasonal or thin)


Southwest	ONT	DAL	2h 50m	76%	1.5%	399	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Southwest Details →	ONT 05:15 → PHX 06:30WN 864	1h 45m Phoenix	PHX 08:15 → DAL 12:40WN 875	5h 25m	98%	91%
Southwest Details →	ONT 23:55 → MDW 05:40WN 3153	1h 00m Chicago	MDW 06:40 → DAL 09:00 +1WN 3796	7h 05m	83%	76%
Delta Details →	ONT 11:50 → ATL 19:11DL 665	2h 04m Atlanta	ATL 21:15 → DAL 22:34DL 1104	8h 44m	95%	75%
Southwest Details →	ONT 08:00 → PHX 09:15WN 4421	1h 40m Phoenix	PHX 10:55 → DAL 15:20WN 3255	5h 20m	100%	74%
Southwest Details →	ONT 06:12 → OAK 07:38WN 3042	3h 22m Oakland	OAK 11:00 → DAL 16:25WN 3014	8h 13m	100%	73%
Delta Details →	ONT 07:05 → ATL 14:23DL 761	2h 15m Atlanta	ATL 16:38 → DAL 17:55DL 2780	8h 50m	97%	73%
Southwest Details →	ONT 09:40 → HOU 14:50WN 4868	2h 40m Houston	HOU 17:30 → DAL 18:40WN 46	7h 00m	100%	72%
Southwest Details →	ONT 05:50 → DEN 09:05WN 3144	1h 00m Denver	DEN 10:05 → DAL 13:10WN 1518	5h 20m	97%	71%
Tight connection: often missed
Southwest Details →	ONT 12:45 → PHX 14:00WN 3062	50m Phoenix	PHX 14:50 → DAL 19:15WN 1937	4h 30m	73%	45%
Southwest Details →	ONT 14:30 → DEN 17:40WN 3147	1h 25m Denver	DEN 19:05 → DAL 22:05WN 1522	5h 35m	65%	16%
Southwest Details →	ONT 16:40 → LAS 17:45WN 2213	1h 00m Las Vegas	LAS 18:45 → DAL 23:30WN 2221	4h 50m	34%	12%

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

LAS · 1h 15m · leaves 05:30 2%

DEN · 1h 00m · leaves 05:50 3%

MDW · 1h 00m · leaves 23:55 17%

Afternoon and evening

LAS · 1h 00m · leaves 16:40 66%

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.


American AA 1194 ONT 06:11 → PHX Southwest WN 3255 PHX 10:55 → DAL Connection details →	3h 25m	7h 09m	96%	70%
United UA 2446 ONT 05:00 → DEN Southwest WN 1518 DEN 10:05 → DAL Connection details →	1h 45m	6h 10m	94%	68%
Frontier F9 1500 ONT 06:00 → DEN Southwest WN 2354 DEN 11:40 → DAL Connection details →	2h 16m	6h 45m	95%	60%

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