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 BUF → PHL flights land within a few points of 4 in 5 on time whatever the hour.

Nonstops


American	BUF	PHL	1h 26m	81%	2.5%	1,362	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Delta Details →	BUF 06:29 → DTW 07:42DL 2898	2h 28m Detroit	DTW 10:10 → PHL 11:46DL 2331	5h 20m	98%	83%
Delta Details →	BUF 06:00 → ATL 08:10DL 2664	3h 11m Atlanta	ATL 11:21 → PHL 13:24DL 2279	7h 26m	99%	81%
American Details →	BUF 07:15 → BOS 08:51AA 4788 · flown by Republic	3h 47m Boston	BOS 12:38 → PHL 14:16AA 3043	7h 01m	100%	79%
United Details →	BUF 10:34 → IAD 11:50UA 3430 · flown by Republic	1h 05m Dulles	IAD 12:55 → PHL 14:10UA 3541 · flown by Republic	3h 36m	88%	76%
American Details →	BUF 06:01 → CLT 08:01AA 1204	2h 59m Charlotte	CLT 11:00 → PHL 12:43AA 2498	6h 42m	98%	76%
American Details →	BUF 06:00 → ORD 07:03AA 1195	1h 26m Chicago	ORD 08:29 → PHL 11:41AA 471	5h 41m	94%	72%
United Details →	BUF 06:15 → IAD 07:34UA 3668 · flown by Republic	1h 01m Dulles	IAD 08:35 → PHL 09:45UA 4015 · flown by Mesa	3h 30m	90%	69%
American Details →	BUF 11:22 → BOS 12:55AA 4666 · flown by Republic	2h 11m Boston	BOS 15:06 → PHL 16:44AA 1776	5h 22m	100%	68%
Tight connection: often missed
JetBlue Details →	BUF 09:14 → FLL 12:10B6 2465	54m Fort Lauderdale	FLL 13:04 → PHL 15:54B6 2276	6h 36m	74%	53%
American Details →	BUF 13:47 → CLT 15:49AA 1616	56m Charlotte	CLT 16:45 → PHL 18:41AA 1838	4h 50m	68%	46%
American Details →	BUF 19:35 → CLT 21:36AA 1614	53m Charlotte	CLT 22:29 → PHL 00:17 +1AA 2189	4h 42m	58%	41%

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 05m · leaves 10:34 12%

BOS · 46m · leaves 07:15 15%

Afternoon and evening

ATL · 1h 11m · leaves 19:24 12%

IAD · 55m · leaves 19:52 19%

CLT · 53m · leaves 19:35 42%

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 769 BUF 06:25 → TPA American AA 2807 TPA 10:48 → PHL Connection details →	1h 38m	7h 02m	100%	89%
JetBlue B6 716 BUF 06:00 → BOS Delta DL 5805 BOS 10:50 → PHL Connection details →	3h 23m	6h 28m	96%	80%
Delta DL 3639 BUF 09:03 → DTW American AA 5530 DTW 12:58 → PHL Connection details →	2h 40m	5h 36m	94%	76%

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