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 72% on time.

Nonstops


Frontier	DFW	ONT	3h 13m	82%	1.8%	327	Flying now
American	DFW	ONT	3h 15m	70%	2.7%	1,969	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 Dallas-Fort Worth). Layovers up to 4 hours. Pick a connection for the details.


Frontier Details →	DFW 05:18 → DEN 06:31F9 2147	2h 13m Denver	DEN 08:44 → ONT 10:05F9 2907	6h 47m	99%	89%
Delta Details →	DFW 07:45 → SLC 09:34DL 1291	1h 45m Salt Lake City	SLC 11:19 → ONT 12:10DL 3172	6h 25m	96%	85%
United Details →	DFW 08:45 → DEN 10:06UA 644	1h 19m Denver	DEN 11:25 → ONT 12:47UA 430	6h 02m	95%	84%
American Details →	DFW 13:40 → PHX 14:08AA 2113	2h 59m Phoenix	PHX 17:07 → ONT 18:21AA 864	6h 41m	99%	82%
Delta Details →	DFW 12:30 → SLC 14:25DL 2798	1h 20m Salt Lake City	SLC 15:45 → ONT 16:41DL 4443 · flown by SkyWest	6h 11m	94%	80%
Delta Details →	DFW 18:12 → SLC 20:00DL 2812	2h 59m Salt Lake City	SLC 22:59 → ONT 23:48DL 1614	7h 36m	92%	79%
Frontier Details →	DFW 18:18 → DEN 19:35F9 2631	2h 54m Denver	DEN 22:29 → ONT 23:49F9 1261	7h 31m	95%	76%
Alaska Details →	DFW 17:45 → PDX 19:49AS 646	1h 41m Portland	PDX 21:30 → ONT 23:51AS 97	8h 06m	94%	76%
Tight connection: often missed
United Details →	DFW 16:50 → DEN 18:20UA 1303	1h 00m Denver	DEN 19:20 → ONT 20:42UA 2028	5h 52m	59%	44%
United Details →	DFW 16:13 → ORD 18:55UA 2299	1h 23m Chicago	ORD 20:18 → ONT 22:51UA 658	8h 38m	73%	41%
American Details →	DFW 15:57 → CLT 19:45AA 2407	58m Charlotte	CLT 20:43 → ONT 22:34AA 3036	8h 37m	34%	20%

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 19m · leaves 08:45 5%

PHX · 1h 16m · leaves 08:55 14%

Afternoon and evening

SEA · 1h 12m · leaves 16:15 18%

DEN · 1h 00m · leaves 16:50 41%

CLT · 58m · leaves 15:57 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.


United UA 773 DFW 05:45 → DEN Frontier F9 2907 DEN 08:44 → ONT Connection details →	1h 51m	6h 20m	96%	86%
American AA 1523 DFW 07:04 → DEN United UA 430 DEN 11:25 → ONT Connection details →	3h 17m	7h 43m	98%	86%
American AA 1969 DFW 07:00 → LAS Southwest WN 2298 LAS 11:30 → ONT Connection details →	3h 39m	7h 32m	99%	80%

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