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

No nonstop, and no clear pattern: the best connection reaches Dulles on time 87% of the time.

Nonstops (none in the current schedule)


United	SJC	IAD	–	100%few flights	0.0%	1	Not flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Dulles on time. Total trip = scheduled departure to arrival, layover included (Dulles is 3 h ahead of San Jose). Layovers up to 4 hours. Pick a connection for the details.


Southwest + Unitedtwo ticketsDetails →	SJC 17:05 → DEN 20:30WN 4246	3h 29m Denver	DEN 23:59 → IAD 05:27 +1UA 1924	9h 22m	100%	93%
Southwest + Unitedtwo ticketsDetails →	SJC 16:20 → LAX 17:40WN 4541	3h 50m Los Angeles	LAX 21:30 → IAD 05:36 +1UA 2632	10h 16m	100%	93%
Delta + Unitedtwo ticketsDetails →	SJC 07:20 → SEA 09:49DL 4041 · flown by SkyWest	3h 11m Seattle	SEA 13:00 → IAD 21:06UA 2131	10h 46m	99%	92%
Southwest + Unitedtwo ticketsDetails →	SJC 11:35 → LAX 12:55WN 2384	3h 54m Los Angeles	LAX 16:49 → IAD 00:55 +1UA 1573	10h 20m	100%	88%
Delta + Unitedtwo ticketsDetails →	SJC 07:00 → LAX 08:27DL 1654	2h 12m Los Angeles	LAX 10:39 → IAD 18:48UA 2667	8h 48m	97%	87%
Alaska + Unitedtwo ticketsDetails →	SJC 18:37 → PDX 20:29AS 3030 · flown by SkyWest	3h 01m Portland	PDX 23:30 → IAD 07:32 +1UA 498	9h 55m	98%	87%
Southwest + Unitedtwo ticketsDetails →	SJC 09:00 → SAN 10:25WN 3507	2h 32m San Diego	SAN 12:57 → IAD 21:05UA 444	9h 05m	100%	87%
Delta + Unitedtwo ticketsDetails →	SJC 18:12 → LAX 19:37DL 1438	3h 53m Los Angeles	LAX 23:30 → IAD 07:33 +1UA 2282	10h 21m	100%	87%
Tight connection: often missed
United Details →	SJC 14:32 → DEN 18:10UA 719	1h 03m Denver	DEN 19:13 → IAD 00:45 +1UA 1412	7h 13m	70%	51%

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.

Afternoon and evening

SLC · 57m · leaves 13:40 8%

IAH · 1h 15m · leaves 13:10 17%

DFW · 1h 14m · leaves 11:47 21%

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.

The table above includes two-ticket connections (marked “two tickets”), held to the 90-minute minimum. One ticket only →

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