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 5% of the time at 8 am and almost half the time at 7 pm.

Nonstops


JetBlue	BOS	SEA	6h 25m	79%	1.2%	247	Flying now
Delta	BOS	SEA	6h 25m	73%	1.4%	1,035	Flying now
Alaska	BOS	SEA	6h 22m	72%	1.1%	1,222	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Seattle on time. Total trip = scheduled departure to arrival, layover included (Seattle is 3 h behind Boston). Layovers up to 4 hours. Pick a connection for the details.


United Details →	BOS 06:21 → LAX 09:35UA 360	2h 08m Los Angeles	LAX 11:43 → SEA 14:36UA 325	11h 15m	100%	89%
United Details →	BOS 05:45 → IAD 07:23UA 1734	1h 37m Dulles	IAD 09:00 → SEA 11:51UA 2101	9h 06m	99%	89%
Delta Details →	BOS 07:50 → LAS 10:31DL 497	3h 04m Las Vegas	LAS 13:35 → SEA 16:23DL 2905	11h 33m	99%	87%
United Details →	BOS 08:15 → ORD 10:12UA 1834	3h 18m Chicago	ORD 13:30 → SEA 16:09UA 1660	10h 54m	100%	86%
Delta Details →	BOS 06:05 → SLC 09:18DL 859	2h 17m Salt Lake City	SLC 11:35 → SEA 12:52DL 2995	9h 47m	99%	86%
Delta Details →	BOS 05:30 → ATL 08:15DL 2242	2h 55m Atlanta	ATL 11:10 → SEA 13:38DL 648	11h 08m	100%	86%
Alaska Details →	BOS 06:03 → PDX 09:19AS 311	2h 44m Portland	PDX 12:03 → SEA 13:03AS 3078 · flown by SkyWest	10h 00m	100%	85%
Delta Details →	BOS 06:30 → AUS 09:48DL 1410	1h 31m Austin	AUS 11:19 → SEA 13:54DL 1684	10h 24m	92%	85%
Tight connection: often missed
Delta Details →	BOS 11:15 → SLC 14:24DL 464	50m Salt Lake City	SLC 15:14 → SEA 16:30DL 2817	8h 15m	66%	50%
Delta Details →	BOS 17:05 → JFK 18:43DL 5814 · flown by Republic	47m New York	JFK 19:30 → SEA 23:08DL 688	9h 03m	51%	31%
American Details →	BOS 18:31 → ORD 21:00AA 1554	1h 15m Chicago	ORD 22:15 → SEA 00:52 +1AA 1459	9h 21m	69%	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

IAH · 1h 10m · leaves 05:47 2%

PDX · 1h 16m · leaves 06:03 5%

PHL · 58m · leaves 06:00 5%

Afternoon and evening

JFK · 47m · leaves 17:05 49%

PHL · 46m · leaves 17:05 53%

DEN · 1h 00m · leaves 17:30 71%

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 2315 BOS 07:00 → PHX Delta DL 2419 PHX 12:05 → SEA Connection details →	2h 32m	11h 18m	98%	91%
United UA 360 BOS 06:21 → LAX Delta DL 1045 LAX 11:59 → SEA Connection details →	2h 24m	11h 33m	99%	87%
Alaska AS 311 BOS 06:03 → PDX Delta DL 3818 PDX 11:20 → SEA Connection details →	2h 01m	9h 33m	95%	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