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

No clear winner: Southwest’s OAK → DEN flights land within a few points of 3 in 4 on time whatever the hour.

Nonstops


Southwest	OAK	DEN	2h 25m	74%	0.3%	1,602	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Denver on time. Total trip = scheduled departure to arrival, layover included (Denver is 1 h ahead of Oakland). Layovers up to 4 hours. Pick a connection for the details.


Alaska Details →	OAK 14:50 → SAN 16:26AS 3311 · flown by SkyWest	3h 35m San Diego	SAN 20:01 → DEN 23:30AS 1619	7h 40m	98%	94%
Southwest Details →	OAK 05:00 → PDX 06:40WN 471	50m Portland	PDX 07:30 → DEN 11:00WN 4099	5h 00m	94%	90%
Southwest Details →	OAK 05:00 → LAS 06:30WN 2325	2h 25m Las Vegas	LAS 08:55 → DEN 11:50WN 247	5h 50m	98%	86%
Delta Details →	OAK 06:00 → SLC 08:55DL 4061 · flown by SkyWest	1h 20m Salt Lake City	SLC 10:15 → DEN 11:53DL 1553	4h 53m	98%	82%
Southwest Details →	OAK 05:10 → PHX 07:05WN 3066	3h 55m Phoenix	PHX 11:00 → DEN 13:45WN 3262	7h 35m	100%	81%
Alaska Details →	OAK 06:22 → SEA 08:26AS 491	3h 18m Seattle	SEA 11:44 → DEN 15:38AS 535	8h 16m	100%	77%
Southwest Details →	OAK 11:05 → BUR 12:15WN 1268	2h 30m Burbank	BUR 14:45 → DEN 18:10WN 138	6h 05m	96%	76%
Southwest Details →	OAK 13:55 → SNA 15:25WN 3087	2h 40m Santa Ana	SNA 18:05 → DEN 21:25WN 1538	6h 30m	100%	76%
Tight connection: often missed
Southwest Details →	OAK 23:55 → MDW 06:00WN 3059	50m Chicago	MDW 06:50 → DEN 08:20 +1WN 2765	7h 25m	57%	48%
Southwest Details →	OAK 16:20 → PHX 18:20WN 878	1h 10m Phoenix	PHX 19:30 → DEN 22:20WN 3267	5h 00m	71%	35%
Southwest Details →	OAK 12:05 → SAN 13:35WN 3075	1h 20m San Diego	SAN 14:55 → DEN 18:20WN 3497	5h 15m	68%	21%

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

LAS · 1h 10m · leaves 09:00 0%

SLC · 1h 20m · leaves 06:00 2%

SAN · 1h 05m · leaves 08:05 12%

Afternoon and evening

SLC · 1h 05m · leaves 17:05 7%

PHX · 1h 10m · leaves 16:20 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 471 OAK 05:00 → PDX United UA 2375 PDX 08:50 → DEN Connection details →	2h 10m	6h 24m	100%	96%
Southwest WN 1926 OAK 15:45 → SAN Alaska AS 1619 SAN 20:01 → DEN Connection details →	2h 41m	6h 45m	97%	93%
Southwest WN 4978 OAK 13:20 → LAX United UA 2610 LAX 18:45 → DEN Connection details →	4h 00m	7h 55m	100%	91%

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