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 82% on time.

Nonstops


United	SJC	DEN	2h 36m	89%	0.3%	990	Flying now
Southwest	SJC	DEN	2h 30m	76%	0.5%	1,528	Flying now
Frontier	SJC	DEN	2h 47m	87%	0.0%	46	Not 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 San Jose). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	SJC 06:30 → BUR 07:40WN 4843	55m Burbank	BUR 08:35 → DEN 11:50WN 351	4h 20m	96%	93%
Alaska Details →	SJC 15:15 → SAN 16:49AS 3429 · flown by SkyWest	3h 12m San Diego	SAN 20:01 → DEN 23:30AS 1619	7h 15m	98%	92%
Southwest Details →	SJC 06:00 → LAS 07:35WN 2280	1h 20m Las Vegas	LAS 08:55 → DEN 11:50WN 247	4h 50m	100%	86%
Southwest Details →	SJC 06:22 → LGB 07:42WN 4933	2h 03m Long Beach	LGB 09:45 → DEN 13:00WN 4238	5h 38m	100%	84%
Southwest Details →	SJC 22:55 → MDW 05:00WN 3886	1h 50m Chicago	MDW 06:50 → DEN 08:20 +1WN 2765	8h 25m	100%	84%
Southwest Details →	SJC 06:25 → PHX 08:20WN 3186	2h 40m Phoenix	PHX 11:00 → DEN 13:45WN 3262	6h 20m	100%	81%
Delta Details →	SJC 06:00 → SLC 08:55DL 1314	1h 20m Salt Lake City	SLC 10:15 → DEN 11:53DL 1553	4h 53m	97%	80%
Southwest Details →	SJC 12:10 → BUR 13:20WN 3661	1h 25m Burbank	BUR 14:45 → DEN 18:10WN 138	5h 00m	100%	79%
Tight connection: often missed
Alaska Details →	SJC 08:20 → SEA 10:31AS 1426	1h 13m Seattle	SEA 11:44 → DEN 15:38AS 535	6h 18m	61%	46%
Southwest Details →	SJC 17:00 → SAN 18:25WN 3702	1h 10m San Diego	SAN 19:35 → DEN 22:55WN 4152	4h 55m	61%	24%
Southwest Details →	SJC 14:58 → SAN 16:22WN 3701	58m San Diego	SAN 17:20 → DEN 20:40WN 4151	4h 42m	41%	18%

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 06:00 0%

SNA · 1h 17m · leaves 08:12 2%

SLC · 1h 20m · leaves 06:00 3%

Afternoon and evening

MDW · 1h 15m · leaves 10:40 19%

DFW · 1h 00m · leaves 11:47 25%

SAN · 58m · leaves 14:58 59%

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 3701 SJC 14:58 → SAN Alaska AS 1619 SAN 20:01 → DEN Connection details →	3h 39m	7h 32m	98%	94%
Southwest WN 3707 SJC 06:30 → SNA United UA 2843 SNA 10:20 → DEN Connection details →	2h 25m	6h 13m	100%	94%
Southwest WN 940 SJC 14:30 → LAX United UA 2829 LAX 19:45 → DEN Connection details →	3h 55m	7h 45m	100%	92%

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