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

No clear winner: airlines and hours on this route all land within a few points of 86% on time.

Nonstops


United	PDX	IAH	4h 11m	86%	0.3%	874	Flying now
Alaska	PDX	IAH	4h 30m	85%	0.8%	353	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 Portland). Layovers up to 4 hours. Pick a connection for the details.


United Details →	PDX 22:40 → ORD 04:45UA 2094	2h 50m Chicago	ORD 07:35 → IAH 10:36 +1UA 1231	9h 56m	100%	90%
United Details →	PDX 05:15 → SFO 07:01UA 1896	1h 54m San Francisco	SFO 08:55 → IAH 15:07UA 2498	7h 52m	99%	88%
Alaska Details →	PDX 13:48 → SEA 14:43AS 2205 · flown by Horizon	2h 50m Seattle	SEA 17:33 → IAH 23:59AS 1579	8h 11m	100%	88%
United Details →	PDX 11:16 → SFO 13:07UA 1613	3h 33m San Francisco	SFO 16:40 → IAH 22:52UA 2305	9h 36m	100%	85%
United Details →	PDX 13:14 → SFO 15:05UA 2279	3h 49m San Francisco	SFO 18:54 → IAH 00:59 +1UA 1702	9h 45m	100%	83%
American Details →	PDX 21:47 → CLT 05:44AA 1170	1h 58m Charlotte	CLT 07:42 → IAH 09:25 +1AA 1930	9h 38m	93%	83%
United Details →	PDX 23:30 → IAD 07:32UA 498	1h 08m Dulles	IAD 08:40 → IAH 10:59 +1UA 1524	9h 29m	96%	82%
Delta Details →	PDX 00:33 → MSP 05:49DL 2359	1h 16m Minneapolis	MSP 07:05 → IAH 10:02DL 2656	7h 29m	96%	81%
Tight connection: often missed
United Details →	PDX 14:25 → ORD 20:38UA 2336	1h 02m Chicago	ORD 21:40 → IAH 00:34 +1UA 2665	8h 09m	69%	51%
American Details →	PDX 13:45 → ORD 19:50AA 3303	1h 17m Chicago	ORD 21:07 → IAH 23:51AA 3144	8h 06m	71%	34%
American Details →	PDX 11:54 → DFW 17:49AA 2287	47m Dallas-Fort Worth	DFW 18:36 → IAH 19:54AA 1392	6h 00m	55%	27%

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

MSP · 1h 16m · leaves 00:33 4%

SLC · 46m · leaves 05:45 11%

PHX · 54m · leaves 05:20 13%

Afternoon and evening

EWR · 54m · leaves 10:33 21%

ORD · 1h 02m · leaves 14:25 31%

DFW · 47m · leaves 11:54 45%

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.


Delta DL 4471 PDX 07:20 → SEA United UA 2293 SEA 11:55 → IAH Connection details →	3h 21m	9h 15m	98%	88%
Delta DL 2766 PDX 13:25 → LAX United UA 387 LAX 19:21 → IAH Connection details →	3h 30m	9h 25m	98%	88%
Southwest WN 344 PDX 05:00 → LAS United UA 1711 LAS 10:25 → IAH Connection details →	3h 15m	8h 40m	96%	87%

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