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 7% of the time at 8 am and barely half the time at 4 pm.

Nonstops


United	SEA	IAH	4h 26m	87%	0.3%	1,238	Flying now
Alaska	SEA	IAH	4h 25m	77%	0.6%	852	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Houston on time. Total trip = scheduled departure to arrival, layover included (Houston is 2 h ahead of Seattle). Layovers up to 4 hours. Pick a connection for the details.


United Details →	SEA 06:00 → LAX 08:44UA 1692	1h 26m Los Angeles	LAX 10:10 → IAH 15:40UA 277	7h 40m	100%	88%
American Details →	SEA 21:35 → CLT 05:41AA 2793	2h 01m Charlotte	CLT 07:42 → IAH 09:25 +1AA 1930	9h 50m	96%	87%
United Details →	SEA 23:11 → ORD 05:18UA 747	2h 17m Chicago	ORD 07:35 → IAH 10:36 +1UA 1231	9h 25m	96%	86%
United Details →	SEA 05:15 → SFO 07:35UA 5676 · flown by SkyWest	1h 20m San Francisco	SFO 08:55 → IAH 15:07UA 2498	7h 52m	96%	84%
United Details →	SEA 10:29 → SFO 12:47UA 1482	3h 53m San Francisco	SFO 16:40 → IAH 22:52UA 2305	10h 23m	98%	83%
Delta Details →	SEA 23:59 → MSP 05:17DL 953	1h 48m Minneapolis	MSP 07:05 → IAH 10:02 +1DL 2656	8h 03m	98%	82%
Delta Details →	SEA 05:30 → SLC 08:30DL 1128	55m Salt Lake City	SLC 09:25 → IAH 13:28DL 2502	5h 58m	93%	82%
Delta Details →	SEA 12:35 → LAX 15:26DL 2914	3h 09m Los Angeles	LAX 18:35 → IAH 23:59DL 1287	9h 24m	99%	82%
Tight connection: often missed
United Details →	SEA 13:30 → SFO 15:48UA 737	52m San Francisco	SFO 16:40 → IAH 22:52UA 2305	7h 22m	49%	41%
United Details →	SEA 08:45 → SFO 11:03UA 2831	1h 12m San Francisco	SFO 12:15 → IAH 18:27UA 1387	7h 42m	47%	35%
American Details →	SEA 11:40 → DFW 17:50AA 767	46m Dallas-Fort Worth	DFW 18:36 → IAH 19:54AA 1392	6h 14m	49%	24%

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

SFO · 1h 20m · leaves 05:15 4%

IAD · 1h 18m · leaves 23:20 6%

SLC · 55m · leaves 05:30 7%

Afternoon and evening

LAX · 55m · leaves 14:55 20%

DFW · 46m · leaves 11:40 51%

SFO · 52m · leaves 13:30 51%

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 524 SEA 18:10 → LAX United UA 491 LAX 00:51 → IAH Connection details →	3h 51m	10h 02m	100%	91%
Alaska AS 507 SEA 08:06 → MKE United UA 6261 MKE 17:56 → IAH Connection details →	3h 55m	10h 49m	100%	90%
Alaska AS 639 SEA 21:18 → TPA United UA 2319 TPA 09:15 → IAH Connection details →	3h 27m	11h 24m	99%	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