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 SJC → DAL flights land within a few points of 85% on time whatever the hour.

Nonstops (seasonal or thin)


Southwest	SJC	DAL	3h 25m	85%	0.9%	427	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Dallas on time. Total trip = scheduled departure to arrival, layover included (Dallas is 2 h ahead of San Jose). Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	SJC 22:00 → ATL 05:34DL 2136	2h 38m Atlanta	ATL 08:12 → DAL 09:24 +1DL 441	9h 26m	98%	86%
Southwest Details →	SJC 06:22 → LGB 07:42WN 4933	1h 48m Long Beach	LGB 09:30 → DAL 14:30WN 264	6h 08m	100%	85%
Southwest Details →	SJC 21:40 → BWI 05:45WN 621	2h 30m Baltimore	BWI 08:15 → DAL 10:25 +1WN 930	10h 45m	100%	85%
Southwest Details →	SJC 07:40 → LAS 09:10WN 1277	1h 28m Las Vegas	LAS 10:38 → DAL 15:25WN 2218	5h 46m	100%	82%
Delta Details →	SJC 06:35 → ATL 14:14DL 654	2h 24m Atlanta	ATL 16:38 → DAL 17:55DL 2780	9h 20m	99%	74%
Southwest Details →	SJC 09:20 → HOU 15:10WN 3673	3h 50m Houston	HOU 19:00 → DAL 20:10WN 52	8h 50m	100%	74%
Southwest Details →	SJC 06:25 → PHX 08:20WN 3186	2h 35m Phoenix	PHX 10:55 → DAL 15:20WN 3255	6h 55m	100%	74%
Southwest Details →	SJC 13:40 → LAS 15:10WN 714	2h 10m Las Vegas	LAS 17:20 → DAL 22:10WN 2220	6h 30m	96%	68%
Tight connection: often missed
Southwest Details →	SJC 12:40 → AUS 18:05WN 3655	1h 00m Austin	AUS 19:05 → DAL 20:10WN 2134	5h 30m	48%	26%
Southwest Details →	SJC 16:05 → PHX 18:00WN 3266	1h 05m Phoenix	PHX 19:05 → DAL 23:30WN 193	5h 25m	55%	21%
Southwest Details →	SJC 14:35 → DEN 18:00WN 3668	1h 05m Denver	DEN 19:05 → DAL 22:05WN 1522	5h 30m	33%	8%

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

BWI · 1h 05m · leaves 21:40 21%

Afternoon and evening

PHX · 1h 05m · leaves 16:05 45%

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.


Delta DL 2136 SJC 22:00 → ATL Southwest WN 4394 ATL 08:55 → DAL Connection details →	3h 21m	10h 05m	98%	77%
American AA 1694 SJC 06:01 → PHX Southwest WN 3255 PHX 10:55 → DAL Connection details →	2h 50m	7h 19m	96%	70%
Alaska AS 3059 SJC 10:03 → SAN Southwest WN 3582 SAN 15:15 → DAL Connection details →	3h 32m	8h 20m	98%	50%

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