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 9 in 10 on time.

Nonstops


Alaska	ONT	PDX	2h 24m	92%	1.4%	1,020	Flying now
Frontier	ONT	PDX	2h 26m	75%	0.0%	60	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Portland on time. Total trip = scheduled departure to arrival, layover included. Layovers up to 4 hours. Pick a connection for the details.


Alaska Details →	ONT 06:02 → SEA 08:44AS 607	1h 30m Seattle	SEA 10:14 → PDX 11:21AS 3090 · flown by SkyWest	5h 19m	96%	92%
Southwest Details →	ONT 09:45 → SMF 11:10WN 3166	3h 05m Sacramento	SMF 14:15 → PDX 15:45WN 422	6h 00m	100%	88%
Southwest Details →	ONT 06:00 → SMF 07:25WN 3165	2h 47m Sacramento	SMF 10:12 → PDX 11:42WN 949	5h 42m	98%	86%
Delta Details →	ONT 09:40 → SLC 12:28DL 1302	2h 56m Salt Lake City	SLC 15:24 → PDX 16:19DL 1244	6h 39m	100%	86%
Delta Details →	ONT 17:21 → SLC 20:17DL 4443 · flown by SkyWest	2h 33m Salt Lake City	SLC 22:50 → PDX 23:44DL 1373	6h 24m	96%	86%
Delta Details →	ONT 06:00 → SLC 08:50DL 2708	2h 25m Salt Lake City	SLC 11:15 → PDX 12:10DL 1209	6h 10m	98%	85%
Southwest Details →	ONT 05:30 → LAS 06:35WN 3150	2h 45m Las Vegas	LAS 09:20 → PDX 11:40WN 4132	6h 10m	100%	83%
Alaska Details →	ONT 14:05 → SEA 16:45AS 567	3h 40m Seattle	SEA 20:25 → PDX 21:22AS 2387 · flown by Horizon	7h 17m	100%	81%
Tight connection: often missed
Southwest Details →	ONT 15:40 → SMF 17:05WN 670	1h 00m Sacramento	SMF 18:05 → PDX 19:35WN 3813	3h 55m	71%	32%
Southwest Details →	ONT 12:40 → LAS 13:45WN 3151	55m Las Vegas	LAS 14:40 → PDX 16:55WN 2126	4h 15m	48%	28%
Southwest Details →	ONT 14:30 → DEN 17:40WN 3147	1h 45m Denver	DEN 19:25 → PDX 21:00WN 1670	6h 30m	71%	3%

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

PHX · 1h 20m · leaves 05:15 2%

DEN · 1h 05m · leaves 08:05 4%

SEA · 1h 18m · leaves 06:20 6%

Afternoon and evening

SEA · 1h 14m · leaves 14:05 7%

BOI · 1h 15m · leaves 16:18 15%

SMF · 1h 00m · leaves 15:40 29%

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 383 ONT 06:30 → SJC Alaska AS 2256 SJC 09:46 → PDX Connection details →	1h 56m	5h 01m	100%	94%
Southwest WN 3162 ONT 10:50 → SJC Alaska AS 1633 SJC 14:31 → PDX Connection details →	2h 31m	5h 25m	98%	90%
Delta DL 2708 ONT 06:00 → SLC Alaska AS 2333 SLC 11:22 → PDX Connection details →	2h 32m	6h 23m	98%	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