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 3% of the time at 9 am and 44% of the time at 8 pm.

Nonstops


Alaska	IAH	SEA	4h 43m	81%	0.6%	852	Flying now
United	IAH	SEA	4h 48m	79%	0.2%	1,238	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.


United Details →	IAH 07:20 → LAX 08:57UA 2600	2h 46m Los Angeles	LAX 11:43 → SEA 14:36UA 325	9h 16m	100%	89%
United Details →	IAH 05:15 → DEN 06:47UA 1874	1h 14m Denver	DEN 08:01 → SEA 10:00UA 2271	6h 45m	97%	87%
Delta Details →	IAH 07:10 → LAX 08:39DL 1216	3h 20m Los Angeles	LAX 11:59 → SEA 14:54DL 1045	9h 44m	99%	87%
United Details →	IAH 06:30 → DEN 08:02UA 2643	3h 20m Denver	DEN 11:22 → SEA 13:22UA 1424	8h 52m	100%	85%
United Details →	IAH 07:24 → ORD 10:20UA 2182	3h 10m Chicago	ORD 13:30 → SEA 16:09UA 1660	10h 45m	99%	85%
Delta Details →	IAH 05:40 → ATL 08:43DL 1069	2h 27m Atlanta	ATL 11:10 → SEA 13:38DL 648	9h 58m	99%	84%
United Details →	IAH 08:30 → DEN 10:05UA 2816	3h 55m Denver	DEN 14:00 → SEA 16:00UA 2164	9h 30m	100%	84%
United Details →	IAH 07:20 → IAD 11:28UA 1549	1h 42m Dulles	IAD 13:10 → SEA 15:55UA 2241	10h 35m	97%	83%
Tight connection: often missed
United Details →	IAH 14:49 → EWR 19:35UA 2608	55m Newark	EWR 20:30 → SEA 23:44UA 1796	10h 55m	56%	30%
American Details →	IAH 13:36 → ORD 16:35AA 1915	1h 12m Chicago	ORD 17:47 → SEA 20:37AA 3105	9h 01m	60%	26%
JetBlue Details →	IAH 11:51 → JFK 16:41B6 1382	51m New York	JFK 17:32 → SEA 21:02B6 263	11h 09m	43%	26%

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 · 1h 14m · leaves 05:15 3%

ATL · 1h 09m · leaves 05:40 3%

LAX · 1h 01m · leaves 07:10 5%

Afternoon and evening

ORD · 1h 12m · leaves 13:36 40%

EWR · 55m · leaves 14:49 44%

JFK · 51m · leaves 11:51 57%

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.


United UA 2110 IAH 06:00 → LAX Delta DL 1714 LAX 09:40 → SEA Connection details →	2h 11m	8h 34m	100%	92%
United UA 2016 IAH 07:35 → AUS Delta DL 1684 AUS 11:19 → SEA Connection details →	2h 40m	8h 19m	97%	91%
Frontier F9 1755 IAH 16:02 → LAX Alaska AS 495 LAX 21:12 → SEA Connection details →	3h 42m	9h 57m	98%	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