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

No clear winner: Southwest’s DAL → SEA flights land within a few points of 3 in 4 on time whatever the hour.

Nonstops (seasonal or thin)


Southwest	DAL	SEA	4h 15m	75%	0.0%	219	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 2 h behind Dallas). Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	DAL 06:05 → ATL 09:15DL 516	1h 55m Atlanta	ATL 11:10 → SEA 13:38DL 648	9h 33m	96%	81%
Southwest Details →	DAL 06:00 → DEN 07:00WN 1296	3h 05m Denver	DEN 10:05 → SEA 12:05WN 3051	8h 05m	100%	76%
Southwest Details →	DAL 08:50 → PHX 09:20WN 4410	1h 25m Phoenix	PHX 10:45 → SEA 13:50WN 814	7h 00m	97%	76%
Delta Details →	DAL 15:59 → ATL 19:14DL 512	2h 21m Atlanta	ATL 21:35 → SEA 23:59DL 903	10h 00m	95%	73%
Delta Details →	DAL 10:09 → ATL 13:20DL 441	1h 12m Atlanta	ATL 14:32 → SEA 16:49DL 481	8h 39m	91%	70%
Southwest Details →	DAL 06:00 → PHX 06:28WN 1379	2h 07m Phoenix	PHX 08:35 → SEA 11:40WN 3330	7h 40m	100%	70%
Delta Details →	DAL 12:19 → ATL 15:31DL 1115	2h 54m Atlanta	ATL 18:25 → SEA 20:49DL 714	10h 30m	97%	64%
Southwest Details →	DAL 06:05 → LAS 06:50WN 1318	50m Las Vegas	LAS 07:40 → SEA 10:25WN 739	6h 20m	80%	60%
Tight connection: often missed
Southwest Details →	DAL 11:50 → SAN 12:45WN 1394	1h 10m San Diego	SAN 13:55 → SEA 16:50WN 4769	7h 00m	58%	30%
Southwest Details →	DAL 15:20 → PHX 15:45WN 4129	1h 13m Phoenix	PHX 16:58 → SEA 19:55WN 3585	6h 36m	62%	22%
Southwest Details →	DAL 14:05 → MDW 16:20WN 1358	55m Chicago	MDW 17:15 → SEA 19:45WN 2890	7h 40m	54%	14%

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

LAS · 50m · leaves 06:05 20%

Afternoon and evening

ATL · 1h 14m · leaves 12:19 10%

PHX · 1h 13m · leaves 15:20 38%

MDW · 55m · leaves 14:05 46%

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 1326 DAL 06:00 → LAX Delta DL 1714 LAX 09:40 → SEA Connection details →	2h 30m	8h 34m	100%	92%
Southwest WN 1265 DAL 07:35 → AUS Delta DL 1684 AUS 11:19 → SEA Connection details →	2h 39m	8h 19m	95%	89%
Southwest WN 1393 DAL 06:10 → SAN Delta DL 2508 SAN 11:05 → SEA Connection details →	4h 00m	10h 11m	100%	89%

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