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 8% of the time at 8 am and almost half the time at 4 pm.

Nonstops


American	SEA	PHL	5h 13m	85%	2.2%	648	Flying now
Delta	SEA	PHL	5h 10m	84%	1.2%	83	Flying now
Alaska	SEA	PHL	5h 15m	81%	0.9%	657	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 (Philadelphia is 3 h ahead of Seattle). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	SEA 23:05 → MDW 05:00WN 2304	4h 00m Chicago	MDW 09:00 → PHL 11:55 +1WN 4901	9h 50m	100%	96%
Delta Details →	SEA 23:59 → MSP 05:17DL 953	1h 53m Minneapolis	MSP 07:10 → PHL 10:47 +1DL 2688	7h 48m	98%	85%
Delta Details →	SEA 23:15 → BOS 07:35DL 473	3h 15m Boston	BOS 10:50 → PHL 12:28 +1DL 5805 · flown by Republic	10h 13m	100%	85%
Delta Details →	SEA 23:10 → DTW 06:27DL 810	3h 43m Detroit	DTW 10:10 → PHL 11:46 +1DL 2331	9h 39m	99%	85%
American Details →	SEA 20:45 → MIA 05:37AA 1471	3h 23m Miami	MIA 09:00 → PHL 11:55 +1AA 551	12h 10m	99%	85%
Delta Details →	SEA 22:58 → ATL 06:45DL 409	2h 10m Atlanta	ATL 08:55 → PHL 10:57 +1DL 2270	9h 03m	100%	84%
American Details →	SEA 23:23 → DFW 05:18AA 2003	3h 22m Dallas-Fort Worth	DFW 08:40 → PHL 13:02 +1AA 2128	10h 39m	98%	84%
United Details →	SEA 23:11 → ORD 05:18UA 747	1h 57m Chicago	ORD 07:15 → PHL 10:30 +1UA 2038	8h 19m	95%	84%
Tight connection: often missed
United Details →	SEA 10:52 → ORD 17:05UA 2835	54m Chicago	ORD 17:59 → PHL 21:19UA 1776	7h 27m	61%	36%
Delta Details →	SEA 11:15 → BOS 19:43DL 438	57m Boston	BOS 20:40 → PHL 22:22DL 5610 · flown by Republic	8h 07m	59%	31%
American Details →	SEA 13:58 → ORD 20:26AA 2520	1h 16m Chicago	ORD 21:42 → PHL 00:55 +1AA 490	7h 58m	60%	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

DFW · 1h 12m · leaves 05:05 4%

SLC · 57m · leaves 07:15 5%

IAD · 1h 13m · leaves 23:20 7%

Afternoon and evening

BOS · 57m · leaves 11:15 41%

SFO · 54m · leaves 13:30 49%

MDW · 55m · leaves 11:45 51%

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.


Alaska AS 394 SEA 21:33 → MCO American AA 629 MCO 08:40 → PHL Connection details →	2h 24m	10h 43m	97%	89%
Southwest WN 536 SEA 22:45 → BNA American AA 5576 BNA 08:57 → PHL Connection details →	3h 57m	10h 21m	100%	87%
Alaska AS 542 SEA 23:03 → DFW American AA 2128 DFW 08:40 → PHL Connection details →	3h 38m	10h 59m	100%	87%

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