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

No clear winner: airlines and hours on this route all land within a few points of 83% on time.

Nonstops


United	SEA	EWR	5h 21m	84%	1.6%	996	Flying now
Alaska	SEA	EWR	5h 26m	83%	2.2%	1,268	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Alaska Details →	SEA 17:59 → PDX 18:56AS 2302 · flown by Horizon	2h 35m Portland	PDX 21:31 → EWR 05:59 +1AS 1631	9h 00m	98%	92%
Delta Details →	SEA 23:59 → MSP 05:17DL 953	1h 53m Minneapolis	MSP 07:10 → EWR 10:49 +1DL 2864	7h 53m	98%	85%
United Details →	SEA 23:11 → ORD 05:18UA 747	1h 52m Chicago	ORD 07:10 → EWR 10:30 +1UA 563	8h 19m	94%	84%
American Details →	SEA 20:45 → MIA 05:37AA 1471	2h 48m Miami	MIA 08:25 → EWR 11:30 +1AA 1822	11h 45m	97%	83%
Delta Details →	SEA 17:59 → SLC 21:09DL 1165	2h 29m Salt Lake City	SLC 23:38 → EWR 06:00 +1DL 2038	8h 56m	98%	83%
Delta Details →	SEA 22:58 → ATL 06:45DL 409	3h 18m Atlanta	ATL 10:03 → EWR 12:24 +1DL 2401	10h 26m	100%	83%
American Details →	SEA 21:35 → CLT 05:41AA 2793	2h 19m Charlotte	CLT 08:00 → EWR 09:59 +1AA 1782	9h 24m	97%	83%
United Details →	SEA 05:00 → DEN 08:43UA 2601	1h 19m Denver	DEN 10:02 → EWR 16:00UA 1423	8h 00m	99%	82%
Tight connection: often missed
United Details →	SEA 13:55 → ORD 20:21UA 2101	1h 09m Chicago	ORD 21:30 → EWR 00:53 +1UA 1209	7h 58m	74%	48%
United Details →	SEA 08:45 → SFO 11:03UA 2831	1h 32m San Francisco	SFO 12:35 → EWR 21:25UA 1597	9h 40m	68%	43%
United Details →	SEA 19:05 → SFO 21:21UA 2241	1h 14m San Francisco	SFO 22:35 → EWR 07:00 +1UA 1141	8h 55m	34%	27%

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

DEN · 1h 19m · leaves 05:00 1%

IAD · 1h 07m · leaves 23:20 9%

IAH · 1h 10m · leaves 23:49 14%

Afternoon and evening

ATL · 1h 00m · leaves 13:35 20%

ORD · 1h 09m · leaves 13:55 26%

PHX · 56m · leaves 18:15 31%

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 624 SEA 22:39 → IND United UA 3451 IND 09:05 → EWR Connection details →	3h 21m	9h 32m	99%	92%
Alaska AS 280 SEA 22:12 → CMH United UA 3467 CMH 09:12 → EWR Connection details →	3h 32m	9h 53m	100%	90%
Alaska AS 77 SEA 22:37 → PIT United UA 3560 PIT 09:12 → EWR Connection details →	3h 02m	9h 06m	100%	90%

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