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

Connect in the morning. The same one-hour layover misses 3% of the time at 7 am and almost half the time at 10 pm.

Nonstops


JetBlue	BOS	SAN	6h 10m	85%	1.7%	919	Flying now
Alaska	BOS	SAN	6h 20m	75%	1.2%	508	Flying now
Delta	BOS	SAN	6h 16m	70%	1.6%	364	Flying now
Southwest	BOS	SAN	6h 10m	46%	3.4%	58	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	BOS 05:45 → IAD 07:23UA 1734	1h 03m Dulles	IAD 08:26 → SAN 10:49UA 1930	8h 04m	97%	89%
United Details →	BOS 07:45 → DEN 10:19UA 647	3h 11m Denver	DEN 13:30 → SAN 14:55UA 1302	10h 10m	100%	85%
Delta Details →	BOS 05:30 → ATL 08:15DL 2242	3h 38m Atlanta	ATL 11:53 → SAN 13:21DL 540	10h 51m	100%	84%
United Details →	BOS 09:40 → DEN 12:12UA 662	3h 43m Denver	DEN 15:55 → SAN 17:20UA 1281	10h 40m	99%	84%
American Details →	BOS 06:00 → PHL 07:37AA 1146	1h 02m Philadelphia	PHL 08:39 → SAN 11:20AA 1621	8h 20m	95%	83%
JetBlue Details →	BOS 05:15 → JFK 06:28B6 917	1h 17m New York	JFK 07:45 → SAN 10:34B6 189	8h 19m	97%	83%
Alaska Details →	BOS 06:03 → PDX 09:19AS 311	1h 27m Portland	PDX 10:46 → SAN 13:27AS 1394	10h 24m	97%	81%
Delta Details →	BOS 16:25 → LAX 19:47DL 318	2h 53m Los Angeles	LAX 22:40 → SAN 23:40DL 3746 · flown by SkyWest	10h 15m	95%	81%
Tight connection: often missed
United Details →	BOS 18:26 → LAX 21:51UA 639	1h 05m Los Angeles	LAX 22:56 → SAN 23:54UA 594	8h 28m	70%	56%
American Details →	BOS 15:15 → MIA 18:58AA 1565	1h 14m Miami	MIA 20:12 → SAN 22:38AA 2463	10h 23m	75%	33%
American Details →	BOS 17:38 → ORD 19:59AA 1592	1h 11m Chicago	ORD 21:10 → SAN 23:26AA 2457	8h 48m	43%	17%

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

IAD · 1h 03m · leaves 05:45 3%

JFK · 1h 17m · leaves 05:15 3%

PHL · 1h 02m · leaves 06:00 5%

Afternoon and evening

MDW · 1h 05m · leaves 18:15 53%

ORD · 1h 11m · leaves 17:38 57%

DEN · 1h 20m · leaves 17:30 60%

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 499 BOS 07:45 → DEN United UA 1302 DEN 13:30 → SAN Connection details →	3h 11m	10h 10m	99%	84%
Delta DL 5614 BOS 09:10 → MKE Southwest WN 2956 MKE 14:30 → SAN Connection details →	3h 36m	10h 30m	100%	84%
Southwest WN 4156 BOS 06:25 → DEN United UA 1940 DEN 11:15 → SAN Connection details →	2h 25m	9h 16m	98%	81%

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