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 7% of the time at 10 am and 29% of the time at 3 pm.

Nonstops


Delta	SAN	BOS	5h 30m	81%	1.6%	364	Flying now
JetBlue	SAN	BOS	5h 44m	79%	2.0%	919	Flying now
Alaska	SAN	BOS	5h 48m	79%	1.2%	508	Flying now
Southwest	SAN	BOS	5h 30m	34%	0.0%	58	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


American Details →	SAN 21:25 → CLT 05:12AA 1860	3h 43m Charlotte	CLT 08:55 → BOS 11:08 +1AA 1533	10h 43m	99%	95%
United Details →	SAN 22:25 → ORD 04:36UA 1457	2h 57m Chicago	ORD 07:33 → BOS 11:05 +1UA 1076	9h 40m	98%	92%
Southwest Details →	SAN 22:40 → MDW 04:40WN 257	3h 00m Chicago	MDW 07:40 → BOS 10:55 +1WN 4611	9h 15m	100%	90%
Delta Details →	SAN 22:30 → ATL 05:50DL 819	2h 45m Atlanta	ATL 08:35 → BOS 11:14 +1DL 2432	9h 44m	99%	89%
Delta Details →	SAN 17:01 → SLC 20:00DL 1210	3h 31m Salt Lake City	SLC 23:31 → BOS 06:05 +1DL 696	10h 04m	100%	89%
United Details →	SAN 21:59 → IAD 05:59UA 2129	2h 36m Dulles	IAD 08:35 → BOS 10:20 +1UA 641	9h 21m	98%	88%
American Details →	SAN 22:45 → ORD 05:11AA 1543	3h 19m Chicago	ORD 08:30 → BOS 12:07 +1AA 4106 · flown by Envoy	10h 22m	99%	88%
United Details →	SAN 11:01 → SFO 12:47UA 2309	3h 28m San Francisco	SFO 16:15 → BOS 01:11 +1UA 2001	11h 10m	100%	88%
Tight connection: often missed
United Details →	SAN 06:40 → ORD 13:09UA 1069	46m Chicago	ORD 13:55 → BOS 17:31UA 1693	7h 51m	59%	36%
United Details →	SAN 07:15 → SFO 09:01UA 2274	1h 04m San Francisco	SFO 10:05 → BOS 18:59UA 2356	8h 44m	57%	35%
American Details →	SAN 09:58 → ORD 16:29AA 2484	52m Chicago	ORD 17:21 → BOS 20:59AA 1461	8h 02m	68%	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

ATL · 1h 20m · leaves 22:30 1%

LAX · 1h 14m · leaves 06:20 3%

SEA · 1h 10m · leaves 07:00 7%

Afternoon and evening

IAH · 50m · leaves 11:58 31%

ORD · 52m · leaves 09:58 32%

PHX · 1h 01m · leaves 19:15 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.


American AA 1543 SAN 22:45 → ORD United UA 1076 ORD 07:33 → BOS Connection details →	2h 22m	9h 20m	97%	91%
United UA 1457 SAN 22:25 → ORD American AA 4106 ORD 08:30 → BOS Connection details →	3h 54m	10h 42m	98%	88%
Southwest WN 1677 SAN 11:15 → SFO United UA 2001 SFO 16:15 → BOS Connection details →	3h 15m	10h 56m	100%	88%

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