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 7 pm.

Nonstops (seasonal or thin)


Delta	BOS	SAT	4h 33m	78%	2.2%	356	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach San Antonio on time. Total trip = scheduled departure to arrival, layover included (San Antonio is 1 h behind Boston). Layovers up to 4 hours. Pick a connection for the details.


United Details →	BOS 05:45 → IAD 07:23UA 1734	1h 02m Dulles	IAD 08:25 → SAT 10:59UA 1789	6h 14m	97%	89%
United Details →	BOS 07:45 → DEN 10:19UA 647	3h 25m Denver	DEN 13:44 → SAT 16:55UA 1022	10h 10m	100%	88%
United Details →	BOS 08:00 → EWR 09:23UA 570	2h 57m Newark	EWR 12:20 → SAT 15:21UA 515	8h 21m	99%	85%
United Details →	BOS 06:05 → EWR 07:29UA 1833	2h 00m Newark	EWR 09:29 → SAT 12:30UA 591	7h 25m	98%	83%
Delta Details →	BOS 05:30 → ATL 08:15DL 2242	4h 00m Atlanta	ATL 12:15 → SAT 13:38DL 1408	9h 11m	100%	83%
United Details →	BOS 06:00 → ORD 07:58UA 1414	1h 27m Chicago	ORD 09:25 → SAT 12:29UA 490	7h 29m	99%	82%
American Details →	BOS 06:00 → PHL 07:37AA 1146	2h 53m Philadelphia	PHL 10:30 → SAT 13:30AA 2489	8h 30m	99%	81%
Southwest Details →	BOS 05:25 → MDW 07:00WN 3239	3h 35m Chicago	MDW 10:35 → SAT 13:15WN 2570	8h 50m	100%	81%
Tight connection: often missed
American Details →	BOS 15:19 → DCA 17:21AA 4380 · flown by Republic	1h 11m Washington	DCA 18:32 → SAT 21:13AA 1947	6h 54m	73%	38%
United Details →	BOS 17:00 → ORD 19:00UA 2040	58m Chicago	ORD 19:58 → SAT 22:57UA 1394	6h 57m	52%	28%
American Details →	BOS 17:38 → ORD 19:59AA 1592	1h 09m Chicago	ORD 21:08 → SAT 23:59AA 431	7h 21m	42%	18%

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 02m · leaves 05:45 3%

JFK · 1h 12m · leaves 06:06 4%

DFW · 1h 18m · leaves 06:00 4%

Afternoon and evening

STL · 1h 20m · leaves 18:50 42%

ORD · 1h 09m · leaves 17:38 58%

DAL · 50m · leaves 17:45 73%

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 1022 DEN 13:44 → SAT Connection details →	3h 25m	10h 10m	99%	87%
American AA 377 BOS 09:41 → PHX Southwest WN 1230 PHX 16:05 → SAT Connection details →	3h 42m	11h 34m	96%	84%
JetBlue B6 917 BOS 05:15 → JFK Delta DL 1166 JFK 08:37 → SAT Connection details →	2h 09m	7h 35m	98%	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