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 3 in 4 on time.

Nonstops


United	DEN	SJC	2h 39m	81%	0.0%	988	Flying now
Southwest	DEN	SJC	2h 35m	70%	0.6%	1,526	Flying now
Frontier	DEN	SJC	2h 40m	83%	0.0%	46	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Southwest Details →	DEN 07:45 → LGB 09:15WN 1580	2h 45m Long Beach	LGB 12:00 → SJC 13:10WN 4973	6h 25m	100%	93%
Southwest Details →	DEN 06:32 → SAN 07:58WN 4331	1h 32m San Diego	SAN 09:30 → SJC 11:00WN 4509	5h 28m	100%	93%
Southwest Details →	DEN 07:50 → SNA 09:15WN 1745	2h 45m Santa Ana	SNA 12:00 → SJC 13:25WN 3861	6h 35m	100%	91%
Southwest Details →	DEN 07:45 → BOI 09:45WN 818	2h 35m Boise	BOI 12:20 → SJC 13:05WN 714	6h 20m	100%	91%
Southwest Details →	DEN 07:40 → LAS 08:35WN 1559	3h 35m Las Vegas	LAS 12:10 → SJC 13:45WN 1242	7h 05m	100%	90%
Southwest Details →	DEN 06:15 → PHX 07:05WN 1675	2h 35m Phoenix	PHX 09:40 → SJC 11:35WN 3336	6h 20m	98%	89%
Delta Details →	DEN 07:05 → SLC 08:36DL 1581	3h 04m Salt Lake City	SLC 11:40 → SJC 12:38DL 1254	6h 33m	96%	87%
Southwest Details →	DEN 10:28 → SNA 11:50WN 4175	3h 10m Santa Ana	SNA 15:00 → SJC 16:20WN 3863	6h 52m	100%	86%
Tight connection: often missed
Southwest Details →	DEN 17:30 → LAS 18:30WN 1564	1h 40m Las Vegas	LAS 20:10 → SJC 21:40WN 2352	5h 10m	74%	51%
Alaska Details →	DEN 12:55 → SEA 14:53AS 381	49m Seattle	SEA 15:42 → SJC 17:53AS 319	5h 58m	61%	31%
American Details →	DEN 18:56 → PHX 19:52AA 1638	59m Phoenix	PHX 20:51 → SJC 22:41AA 1197	4h 45m	50%	30%

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 20m · leaves 07:40 6%

DFW · 1h 10m · leaves 05:00 7%

MSP · 1h 06m · leaves 06:00 8%

Afternoon and evening

SAN · 1h 10m · leaves 16:55 46%

PHX · 59m · leaves 18:56 50%

LGB · 55m · leaves 14:05 61%

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 1569 DEN 09:35 → LAX Delta DL 3822 LAX 14:32 → SJC Connection details →	3h 27m	7h 11m	100%	95%
United UA 4765 DEN 07:45 → BOI Southwest WN 714 BOI 12:20 → SJC Connection details →	2h 27m	6h 20m	100%	91%
Southwest WN 1568 DEN 07:50 → LAX Delta DL 3842 LAX 12:57 → SJC Connection details →	3h 37m	7h 29m	100%	90%

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