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

No clear winner: American’s PHL → ACK flights land within a few points of 4 in 5 on time whatever the hour.

Nonstops (seasonal or thin)


American	PHL	ACK	1h 35m	81%	1.6%	122	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Nantucket on time. Total trip = scheduled departure to arrival, layover included. Layovers up to 4 hours. Pick a connection for the details.


JetBlue Details →	PHL 08:49 → BOS 10:10B6 1160	2h 02m Boston	BOS 12:12 → ACK 13:03B6 1352	4h 14m	96%	76%
American Details →	PHL 07:18 → BOS 08:42AA 3225	53m Boston	BOS 09:35 → ACK 10:49AA 4708 · flown by Republic	3h 31m	87%	71%

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

BOS · 53m · leaves 07:18 13%

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 3225 PHL 07:18 → BOS JetBlue B6 1352 BOS 12:12 → ACK Connection details →	3h 30m	5h 45m	100%	80%
Delta DL 5740 PHL 06:00 → BOS American AA 4708 BOS 09:35 → ACK Connection details →	2h 05m	4h 49m	96%	78%

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