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

No nonstop, and no clear pattern: the best connection reaches Miami on time 87% of the time.

Best connections, any airlines

Ranked by chance you reach Miami on time. Total trip = scheduled departure to arrival, layover included (Miami is 3 h ahead of Ontario). Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	ONT 17:21 → SLC 20:17DL 4443 · flown by SkyWest	2h 43m Salt Lake City	SLC 23:00 → MIA 05:42 +1DL 2040	9h 21m	96%	87%
Delta Details →	ONT 22:00 → ATL 05:18DL 2892	2h 12m Atlanta	ATL 07:30 → MIA 09:30 +1DL 2836	8h 33m	100%	86%
American Details →	ONT 22:10 → CLT 05:48AA 2237	3h 37m Charlotte	CLT 09:25 → MIA 11:37 +1AA 1436	10h 27m	99%	84%
United Details →	ONT 18:39 → SFO 20:07UA 5624 · flown by SkyWest	2h 47m San Francisco	SFO 22:54 → MIA 07:39 +1UA 1769	10h 00m	96%	82%
Southwest Details →	ONT 21:40 → BWI 05:30WN 3143	2h 42m Baltimore	BWI 08:12 → MIA 10:52 +1WN 3278	10h 12m	100%	80%
Delta + Americantwo ticketsDetails →	ONT 06:20 → SEA 09:17DL 3816 · flown by SkyWest	3h 39m Seattle	SEA 12:56 → MIA 21:55AA 654	12h 35m	99%	78%
Southwest + Americantwo ticketsDetails →	ONT 05:50 → DEN 09:05WN 3144	3h 07m Denver	DEN 12:12 → MIA 18:20AA 3118	9h 30m	100%	77%
Southwest + Americantwo ticketsDetails →	ONT 08:35 → LAS 09:40WN 2333	3h 05m Las Vegas	LAS 12:45 → MIA 20:41AA 1105	9h 06m	100%	77%
Tight connection: often missed
American Details →	ONT 23:59 → DFW 05:00AA 3006	1h 00m Dallas-Fort Worth	DFW 06:00 → MIA 10:00 +1AA 3055	7h 01m	70%	56%
American Details →	ONT 19:15 → PHX 20:36AA 2639	1h 24m Phoenix	PHX 22:00 → MIA 05:22 +1AA 2205	7h 07m	69%	46%

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

SFO · 1h 15m · leaves 06:00 4%

DEN · 55m · leaves 08:05 5%

PHX · 1h 19m · leaves 06:11 7%

Afternoon and evening

ATL · 1h 05m · leaves 11:50 13%

DFW · 57m · leaves 10:25 19%

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.

The table above includes two-ticket connections (marked “two tickets”), held to the 90-minute minimum. One ticket only →

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