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, any airlines

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.


Southwest + Deltatwo ticketsDetails →	HOU 07:35 → SMF 09:25WN 2082	3h 35m Sacramento	SMF 13:00 → SEA 15:16DL 4125 · flown by SkyWest	9h 41m	100%	93%
Southwest + Alaskatwo ticketsDetails →	HOU 05:30 → LAS 06:30WN 2251	3h 58m Las Vegas	LAS 10:28 → SEA 13:14AS 629	9h 44m	100%	89%
Southwest + Deltatwo ticketsDetails →	HOU 07:30 → LAX 08:55WN 2007	3h 04m Los Angeles	LAX 11:59 → SEA 14:54DL 1045	9h 24m	100%	88%
Southwest + Deltatwo ticketsDetails →	HOU 07:45 → ONT 08:55WN 4391	3h 04m Ontario	ONT 11:59 → SEA 14:53DL 4070 · flown by SkyWest	9h 15m	96%	88%
Southwest + Deltatwo ticketsDetails →	HOU 07:50 → LAS 09:00WN 1998	1h 59m Las Vegas	LAS 10:59 → SEA 13:51DL 2922	8h 01m	98%	87%
Southwest + Deltatwo ticketsDetails →	HOU 05:50 → ATL 08:50WN 2622	2h 20m Atlanta	ATL 11:10 → SEA 13:38DL 648	9h 48m	100%	87%
Southwest + Deltatwo ticketsDetails →	HOU 06:20 → PHX 06:55WN 2062	2h 25m Phoenix	PHX 09:20 → SEA 12:35DL 2374	8h 15m	98%	85%
Southwest + Deltatwo ticketsDetails →	HOU 07:55 → SAN 09:05WN 3824	2h 00m San Diego	SAN 11:05 → SEA 14:21DL 2508	8h 26m	95%	84%
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.

The table above includes two-ticket connections (marked “two tickets”), held to the 90-minute minimum. One ticket only →

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