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 DEN → OAK flights land within a few points of 2 in 3 on time whatever the hour.

Nonstops


Southwest	DEN	OAK	2h 40m	67%	0.6%	1,605	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Alaska Details →	DEN 12:02 → PDX 13:46AS 684	3h 47m Portland	PDX 17:33 → OAK 19:23AS 2082 · flown by Horizon	8h 21m	100%	98%
Southwest Details →	DEN 07:45 → BUR 09:15WN 2929	2h 20m Burbank	BUR 11:35 → OAK 12:50WN 803	6h 05m	100%	94%
Southwest Details →	DEN 05:45 → LAS 06:40WN 3106	55m Las Vegas	LAS 07:35 → OAK 09:10WN 5052	4h 25m	100%	92%
Southwest Details →	DEN 07:50 → ONT 09:10WN 1660	1h 55m Ontario	ONT 11:05 → OAK 12:20WN 3154	5h 30m	100%	90%
Delta Details →	DEN 19:00 → SLC 20:38DL 2663	2h 12m Salt Lake City	SLC 22:50 → OAK 23:50DL 3797 · flown by SkyWest	5h 51m	95%	90%
Delta Details →	DEN 05:40 → SLC 07:13DL 2544	3h 32m Salt Lake City	SLC 10:45 → OAK 11:53DL 4134 · flown by SkyWest	7h 13m	97%	89%
Southwest Details →	DEN 06:15 → PHX 07:05WN 1675	2h 35m Phoenix	PHX 09:40 → OAK 11:35WN 2680	6h 20m	98%	86%
Southwest Details →	DEN 07:45 → SLC 09:20WN 452	3h 40m Salt Lake City	SLC 13:00 → OAK 13:50WN 2951	7h 05m	100%	85%
Tight connection: often missed
Southwest Details →	DEN 17:30 → LAS 18:30WN 1564	1h 20m Las Vegas	LAS 19:50 → OAK 21:20WN 4270	4h 55m	64%	35%
Southwest Details →	DEN 20:35 → LAS 21:30WN 1566	1h 15m Las Vegas	LAS 22:45 → OAK 00:18 +1WN 596	4h 42m	50%	17%
Southwest Details →	DEN 18:45 → LAX 20:15WN 2217	50m Los Angeles	LAX 21:05 → OAK 22:25WN 4554	4h 40m	11%	6%

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 15m · leaves 10:05 6%

SEA · 59m · leaves 08:40 17%

Afternoon and evening

PHX · 1h 10m · leaves 14:20 23%

LAS · 1h 15m · leaves 20:35 50%

LAX · 50m · leaves 18:45 89%

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 4271 DEN 12:20 → PDX Alaska AS 2082 PDX 17:33 → OAK Connection details →	3h 38m	8h 03m	100%	98%
Southwest WN 4027 DEN 10:05 → SLC Delta DL 3903 SLC 15:20 → OAK Connection details →	3h 35m	7h 18m	100%	91%
United UA 644 DEN 11:27 → PDX Alaska AS 2035 PDX 15:08 → OAK Connection details →	1h 59m	6h 28m	91%	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