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 4% of the time at 10 am and 1 time in 3 at 5 pm.

Nonstops (seasonal or thin)


Delta	SAT	BOS	4h 15m	61%	2.2%	356	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 1 h ahead of San Antonio). Layovers up to 4 hours. Pick a connection for the details.


United Details →	SAT 05:30 → IAH 06:37UA 469	53m Houston	IAH 07:30 → BOS 12:28UA 1977	5h 58m	95%	86%
United Details →	SAT 05:40 → DEN 06:57UA 1464	2h 43m Denver	DEN 09:40 → BOS 15:44UA 1232	9h 04m	99%	84%
Southwest Details →	SAT 05:25 → DEN 06:38WN 1471	3h 22m Denver	DEN 10:00 → BOS 16:05WN 3690	9h 40m	100%	83%
American Details →	SAT 06:01 → CLT 10:00AA 1119	1h 18m Charlotte	CLT 11:18 → BOS 13:33AA 1611	6h 32m	93%	82%
Delta Details →	SAT 05:25 → ATL 08:53DL 1073	1h 07m Atlanta	ATL 10:00 → BOS 12:44DL 855	6h 19m	95%	80%
American Details →	SAT 19:04 → PHX 19:26AA 2053	2h 19m Phoenix	PHX 21:45 → BOS 05:45 +1AA 2701	9h 41m	93%	79%
Delta Details →	SAT 06:40 → ATL 10:06DL 1066	1h 04m Atlanta	ATL 11:10 → BOS 13:47DL 862	6h 07m	96%	78%
American Details →	SAT 05:01 → MIA 09:00AA 1604	1h 50m Miami	MIA 10:50 → BOS 14:22AA 1565	8h 20m	97%	78%
Tight connection: often missed
United Details →	SAT 06:40 → ORD 09:38UA 1332	47m Chicago	ORD 10:25 → BOS 14:04UA 1606	6h 22m	70%	55%
American Details →	SAT 07:23 → PHL 12:04AA 3293	46m Philadelphia	PHL 12:50 → BOS 14:23AA 2882	6h 00m	72%	55%
Southwest Details →	SAT 16:55 → BNA 19:10WN 4193	1h 25m Nashville	BNA 20:35 → BOS 00:55 +1WN 459	6h 15m	67%	29%

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 10m · leaves 05:10 2%

ATL · 1h 04m · leaves 06:40 4%

MSP · 1h 05m · leaves 06:05 5%

Afternoon and evening

DFW · 1h 16m · leaves 14:48 21%

ATL · 1h 01m · leaves 16:40 22%

IAH · 50m · leaves 16:18 34%

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 3568 SAT 18:30 → DEN United UA 2656 DEN 23:59 → BOS Connection details →	3h 59m	10h 28m	96%	87%
Southwest WN 3565 SAT 05:45 → DEN United UA 1232 DEN 09:40 → BOS Connection details →	2h 40m	8h 59m	100%	85%
United UA 1464 SAT 05:40 → DEN Southwest WN 3690 DEN 10:00 → BOS Connection details →	3h 03m	9h 25m	99%	82%

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