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

No clear winner: airlines and hours on this route all land within a few points of 77% on time.

Nonstops


Frontier	LAS	ONT	1h 10m	82%	1.0%	727	Flying now
Southwest	LAS	ONT	1h 05m	74%	0.6%	1,749	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. Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	LAS 07:35 → OAK 09:10WN 5052	1h 40m Oakland	OAK 10:50 → ONT 12:10WN 3062	4h 35m	100%	96%
Southwest Details →	LAS 06:10 → SMF 07:45WN 4589	1h 25m Sacramento	SMF 09:10 → ONT 10:30WN 3805	4h 20m	98%	90%
Delta Details →	LAS 06:00 → SLC 08:20DL 2674	2h 59m Salt Lake City	SLC 11:19 → ONT 12:10DL 3172	6h 10m	99%	90%
Alaska Details →	LAS 11:00 → PDX 13:20AS 1467	1h 10m Portland	PDX 14:30 → ONT 16:52AS 2093 · flown by Horizon	5h 52m	95%	87%
Southwest Details →	LAS 06:20 → PHX 07:35WN 2309	2h 30m Phoenix	PHX 10:05 → ONT 11:20WN 431	5h 00m	98%	87%
Delta Details →	LAS 17:00 → SLC 19:25DL 1672	3h 34m Salt Lake City	SLC 22:59 → ONT 23:48DL 1614	6h 48m	99%	86%
Southwest Details →	LAS 07:10 → SJC 08:40WN 1160	2h 10m San Jose	SJC 10:50 → ONT 12:05WN 3151	4h 55m	100%	86%
Delta Details →	LAS 10:00 → SLC 12:27DL 1698	3h 18m Salt Lake City	SLC 15:45 → ONT 16:41DL 4443 · flown by SkyWest	6h 41m	98%	85%
Tight connection: often missed
United Details →	LAS 18:20 → SFO 20:02UA 1603	58m San Francisco	SFO 21:00 → ONT 22:37UA 552	4h 17m	63%	52%
American Details →	LAS 15:23 → DFW 20:24AA 2376	1h 03m Dallas-Fort Worth	DFW 21:27 → ONT 22:32AA 711	7h 09m	66%	33%
American Details →	LAS 16:53 → DFW 21:49AA 3286	1h 06m Dallas-Fort Worth	DFW 22:55 → ONT 23:59 +1AA 1534	7h 09m	70%	25%

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

SEA · 1h 17m · leaves 07:45 12%

SFO · 52m · leaves 07:00 33%

Afternoon and evening

DFW · 1h 03m · leaves 15:23 34%

SFO · 1h 01m · leaves 13:34 42%

PHX · 50m · leaves 19:45 60%

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 2966 LAS 06:30 → DEN United UA 430 DEN 11:25 → ONT Connection details →	2h 05m	6h 17m	100%	88%
Frontier F9 3016 LAS 07:00 → SLC Delta DL 3172 SLC 11:19 → ONT Connection details →	1h 49m	5h 10m	94%	85%
American AA 1808 LAS 06:44 → PHX Southwest WN 431 PHX 10:05 → ONT Connection details →	2h 07m	4h 36m	95%	83%

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