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 HOU → SEA flights land within a few points of 68% on time whatever the hour.

Nonstops (seasonal or thin)


Southwest	HOU	SEA	4h 35m	68%	0.0%	120	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 Houston). Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	HOU 06:00 → ATL 09:05DL 2557	2h 05m Atlanta	ATL 11:10 → SEA 13:38DL 648	9h 38m	97%	83%
Southwest Details →	HOU 06:20 → PHX 06:55WN 2062	3h 50m Phoenix	PHX 10:45 → SEA 13:50WN 814	9h 30m	100%	79%
Southwest Details →	HOU 05:30 → DEN 06:55WN 1970	50m Denver	DEN 07:45 → SEA 09:45WN 1713	6h 15m	91%	77%
Delta Details →	HOU 10:16 → ATL 13:20DL 1509	1h 12m Atlanta	ATL 14:32 → SEA 16:49DL 481	8h 32m	92%	71%
American Details →	HOU 06:03 → DFW 07:30AA 3395 · flown by Envoy	3h 17m Dallas-Fort Worth	DFW 10:47 → SEA 13:08AA 717	9h 02m	95%	68%
Delta Details →	HOU 17:12 → ATL 20:28DL 2381	1h 07m Atlanta	ATL 21:35 → SEA 23:59DL 903	8h 47m	82%	63%
American Details →	HOU 09:30 → DFW 10:59AA 3573 · flown by Envoy	1h 18m Dallas-Fort Worth	DFW 12:17 → SEA 14:31AA 757	7h 01m	87%	62%
Delta Details →	HOU 13:10 → ATL 16:18DL 1195	2h 07m Atlanta	ATL 18:25 → SEA 20:49DL 714	9h 39m	93%	61%
Tight connection: often missed
American Details →	HOU 20:23 → DFW 21:50AA 3351 · flown by Envoy	51m Dallas-Fort Worth	DFW 22:41 → SEA 00:57 +1AA 1487	6h 34m	67%	26%
Southwest Details →	HOU 13:30 → MDW 15:55WN 2041	1h 20m Chicago	MDW 17:15 → SEA 19:45WN 2890	8h 15m	55%	15%
Southwest Details →	HOU 17:55 → DEN 19:40WN 1974	1h 30m Denver	DEN 21:10 → SEA 23:10WN 3856	7h 10m	52%	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

DEN · 50m · leaves 05:30 9%

DFW · 1h 18m · leaves 09:30 13%

ATL · 47m · leaves 06:00 21%

Afternoon and evening

ATL · 1h 07m · leaves 17:12 18%

DFW · 51m · leaves 20:23 33%

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 2082 HOU 07:35 → SMF Delta DL 4125 SMF 13:00 → SEA Connection details →	3h 35m	9h 41m	100%	93%
Southwest WN 2251 HOU 05:30 → LAS Alaska AS 629 LAS 10:28 → SEA Connection details →	3h 58m	9h 44m	100%	89%
Southwest WN 2007 HOU 07:30 → LAX Delta DL 1045 LAX 11:59 → SEA Connection details →	3h 04m	9h 24m	100%	88%

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