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 AUS → ONT (3h 05m), on time 3 times in 4. Delta via Salt Lake City (5h 55m) is more reliable, 86%, but takes 2h 50m longer.

Nonstops (seasonal or thin)


Southwest	AUS	ONT	3h 05m	75%	0.6%	335	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 Austin). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	AUS 06:40 → PHX 07:00WN 374	3h 05m Phoenix	PHX 10:05 → ONT 11:20WN 431	6h 40m	100%	87%
Delta Details →	AUS 08:15 → SLC 10:13DL 2618	1h 06m Salt Lake City	SLC 11:19 → ONT 12:10DL 3172	5h 55m	95%	86%
Southwest Details →	AUS 07:20 → SJC 08:50WN 398	2h 00m San Jose	SJC 10:50 → ONT 12:05WN 3151	6h 45m	100%	86%
United Details →	AUS 08:30 → DEN 09:49UA 595	1h 36m Denver	DEN 11:25 → ONT 12:47UA 430	6h 17m	97%	84%
American Details →	AUS 05:01 → DFW 06:12AA 2563	2h 08m Dallas-Fort Worth	DFW 08:20 → ONT 09:29AA 2238	6h 28m	97%	84%
Southwest Details →	AUS 05:50 → LAS 06:35WN 321	2h 30m Las Vegas	LAS 09:05 → ONT 10:10WN 4179	6h 20m	100%	82%
Delta Details →	AUS 19:25 → SLC 21:21DL 2581	1h 38m Salt Lake City	SLC 22:59 → ONT 23:48DL 1614	6h 23m	93%	81%
Southwest Details →	AUS 05:45 → DEN 07:00WN 282	50m Denver	DEN 07:50 → ONT 09:10WN 1660	5h 25m	95%	80%
Tight connection: often missed
American Details →	AUS 15:45 → DFW 17:05AA 1405	1h 45m Dallas-Fort Worth	DFW 18:50 → ONT 19:59AA 2236	6h 14m	69%	38%
Southwest Details →	AUS 18:35 → DEN 20:05WN 2573	1h 10m Denver	DEN 21:15 → ONT 22:35WN 1663	6h 00m	56%	20%
Southwest Details →	AUS 19:35 → PHX 20:00WN 4426	1h 00m Phoenix	PHX 21:00 → ONT 22:10WN 2862	4h 35m	46%	17%

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

SLC · 1h 06m · leaves 08:15 5%

DEN · 50m · leaves 05:45 5%

PHX · 50m · leaves 06:40 7%

Afternoon and evening

DEN · 1h 10m · leaves 18:35 44%

LAS · 1h 10m · leaves 20:30 52%

PHX · 55m · leaves 21:35 56%

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 361 AUS 05:39 → DEN Frontier F9 2907 DEN 08:44 → ONT Connection details →	1h 46m	6h 26m	97%	88%
Frontier F9 1815 AUS 06:30 → DEN United UA 430 DEN 11:25 → ONT Connection details →	3h 36m	8h 17m	98%	87%
American AA 455 AUS 06:16 → PHX Southwest WN 431 PHX 10:05 → ONT Connection details →	3h 25m	7h 04m	96%	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