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 12% of the time at 11 am and barely half the time at 5 pm.

Nonstops


Delta	ATL	SEA	5h 24m	78%	0.5%	2,380	Flying now
Alaska	ATL	SEA	5h 31m	75%	1.0%	898	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 Atlanta). Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	ATL 08:10 → PHX 09:11DL 348	2h 54m Phoenix	PHX 12:05 → SEA 15:18DL 2419	10h 08m	99%	92%
Delta Details →	ATL 08:10 → AUS 09:30DL 2976	1h 49m Austin	AUS 11:19 → SEA 13:54DL 1684	8h 44m	100%	91%
Delta Details →	ATL 17:55 → SLC 19:58DL 653	2h 47m Salt Lake City	SLC 22:45 → SEA 23:59DL 2998	9h 04m	98%	90%
Delta Details →	ATL 11:00 → PDX 13:00DL 2206	2h 26m Portland	PDX 15:26 → SEA 16:40DL 4062 · flown by SkyWest	8h 41m	100%	89%
United Details →	ATL 05:30 → IAD 07:20UA 641	1h 40m Dulles	IAD 09:00 → SEA 11:51UA 2101	9h 21m	98%	89%
Delta Details →	ATL 09:16 → SMF 11:07DL 904	1h 53m Sacramento	SMF 13:00 → SEA 15:16DL 4125 · flown by SkyWest	9h 00m	97%	89%
Delta Details →	ATL 07:15 → LAX 08:55DL 996	3h 04m Los Angeles	LAX 11:59 → SEA 14:54DL 1045	10h 39m	98%	86%
Delta Details →	ATL 08:05 → SAN 09:33DL 725	1h 32m San Diego	SAN 11:05 → SEA 14:21DL 2508	9h 16m	97%	86%
Tight connection: often missed
Delta Details →	ATL 16:00 → MCO 17:40DL 1742	1h 03m Orlando	MCO 18:43 → SEA 22:05DL 328	9h 05m	60%	39%
Delta Details →	ATL 17:55 → SLC 19:58DL 653	46m Salt Lake City	SLC 20:44 → SEA 22:05DL 2016	7h 10m	60%	27%
American Details →	ATL 19:43 → ORD 21:11AA 1372	1h 04m Chicago	ORD 22:15 → SEA 00:52 +1AA 1459	8h 09m	48%	21%

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

MSP · 1h 08m · leaves 08:26 6%

SLC · 1h 20m · leaves 08:15 7%

ONT · 1h 19m · leaves 09:15 7%

Afternoon and evening

MSP · 46m · leaves 16:31 45%

DFW · 1h 05m · leaves 17:34 53%

ORD · 51m · leaves 15:50 55%

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 4363 ATL 06:00 → AUS Delta DL 1684 AUS 11:19 → SEA Connection details →	3h 59m	10h 54m	100%	94%
American AA 1777 ATL 07:48 → PHX Delta DL 2419 PHX 12:05 → SEA Connection details →	3h 05m	10h 30m	97%	90%
Delta DL 1219 ATL 15:40 → LAX Alaska AS 495 LAX 21:12 → SEA Connection details →	3h 52m	11h 19m	98%	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