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: United ORD → ONT (4h 31m), on time 3 times in 5. United via Denver (7h 42m) is more reliable, 87%, but takes 3h 11m longer.

Nonstops (seasonal or thin)


United	ORD	ONT	4h 31m	62%	1.4%	290	Flying now

Best connections, any airlines

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 Chicago). Layovers up to 4 hours. Pick a connection for the details.


American + Alaskatwo ticketsDetails →	ORD 08:00 → PDX 10:32AA 2284	3h 58m Portland	PDX 14:30 → ONT 16:52AS 2093 · flown by Horizon	10h 52m	99%	90%
United + Frontiertwo ticketsDetails →	ORD 05:00 → DEN 06:42UA 2666	2h 02m Denver	DEN 08:44 → ONT 10:05F9 2907	7h 05m	99%	90%
United Details →	ORD 06:00 → DEN 07:42UA 2806	3h 43m Denver	DEN 11:25 → ONT 12:47UA 430	8h 47m	100%	87%
American + Deltatwo ticketsDetails →	ORD 10:05 → SLC 12:35AA 2616	3h 10m Salt Lake City	SLC 15:45 → ONT 16:41DL 4443 · flown by SkyWest	8h 36m	99%	86%
Alaska + Deltatwo ticketsDetails →	ORD 08:02 → SEA 10:37AS 587	3h 58m Seattle	SEA 14:35 → ONT 17:19DL 4031 · flown by SkyWest	11h 17m	98%	86%
American + Southwesttwo ticketsDetails →	ORD 05:00 → PHX 06:32AA 2434	3h 33m Phoenix	PHX 10:05 → ONT 11:20WN 431	8h 20m	99%	85%
United + Deltatwo ticketsDetails →	ORD 13:30 → SEA 16:09UA 1660	3h 41m Seattle	SEA 19:50 → ONT 22:41DL 3884 · flown by SkyWest	11h 11m	100%	83%
United + Frontiertwo ticketsDetails →	ORD 07:00 → SEA 09:40UA 341	2h 13m Seattle	SEA 11:53 → ONT 14:39F9 2276	9h 39m	97%	82%
Tight connection: often missed
American Details →	ORD 17:34 → PHX 19:19AA 3261	1h 11m Phoenix	PHX 20:30 → ONT 21:44AA 1238	6h 10m	62%	44%
American Details →	ORD 14:59 → DFW 17:36AA 2257	1h 14m Dallas-Fort Worth	DFW 18:50 → ONT 19:59AA 2236	7h 00m	69%	40%
American Details →	ORD 19:26 → DFW 22:08AA 3544 · flown by Envoy	47m Dallas-Fort Worth	DFW 22:55 → ONT 23:59 +1AA 1534	6h 36m	64%	23%

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 04m · leaves 07:45 17%

DFW · 50m · leaves 05:00 19%

Afternoon and evening

DFW · 47m · leaves 19:26 36%

PHX · 55m · leaves 14:25 70%

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