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

The best bet has a stop: Southwest via Phoenix (6h 10m) reaches Ontario on time 86% of the time, against 70% on the nonstop.

Nonstops (seasonal or thin)


Southwest	MDW	ONT	4h 15m	71%	1.1%	360	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 Chicago). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	MDW 05:20 → PHX 06:55WN 2858	3h 10m Phoenix	PHX 10:05 → ONT 11:20WN 431	8h 00m	100%	88%
Southwest Details →	MDW 05:15 → DEN 06:50WN 2989	1h 00m Denver	DEN 07:50 → ONT 09:10WN 1660	5h 55m	98%	83%
Southwest Details →	MDW 07:30 → LAS 09:20WN 347	2h 10m Las Vegas	LAS 11:30 → ONT 12:32WN 2298	7h 02m	100%	82%
Southwest Details →	MDW 10:20 → SMF 12:40WN 2094	1h 20m Sacramento	SMF 14:00 → ONT 15:20WN 3807	7h 00m	88%	71%
Southwest Details →	MDW 08:40 → PHX 10:20WN 3016	3h 35m Phoenix	PHX 13:55 → ONT 15:05WN 670	8h 25m	100%	71%
Southwest Details →	MDW 18:35 → PHX 20:15WN 2862	2h 40m Phoenix	PHX 22:55 → ONT 00:08 +1WN 223	7h 32m	96%	69%
Southwest Details →	MDW 10:05 → OAK 12:35WN 3366	2h 40m Oakland	OAK 15:15 → ONT 16:35WN 381	8h 30m	98%	68%
Southwest Details →	MDW 06:50 → DEN 08:20WN 2765	2h 35m Denver	DEN 10:55 → ONT 12:10WN 4080	7h 20m	100%	65%
Tight connection: often missed
Southwest Details →	MDW 11:20 → PHX 12:55WN 4189	1h 00m Phoenix	PHX 13:55 → ONT 15:05WN 670	5h 45m	66%	46%
Southwest Details →	MDW 11:20 → BNA 12:45WN 2733	1h 10m Nashville	BNA 13:55 → ONT 16:00WN 855	6h 40m	69%	36%

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 00m · leaves 05:15 2%

Afternoon and evening

ATL · 1h 10m · leaves 12:50 12%

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 2989 MDW 05:15 → DEN Frontier F9 2907 DEN 08:44 → ONT Connection details →	1h 54m	6h 50m	100%	90%
Southwest WN 2765 MDW 06:50 → DEN United UA 430 DEN 11:25 → ONT Connection details →	3h 05m	7h 57m	100%	88%
Southwest WN 2809 MDW 10:05 → PDX Alaska AS 2093 PDX 14:30 → ONT Connection details →	2h 05m	8h 47m	96%	88%

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