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 4 in 5 on time.

Nonstops (seasonal or thin)


Alaska	STL	PDX	4h 17m	91%	2.5%	80	Flying now
Southwest	STL	PDX	–	58%few flights	2.9%	34	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Alaska Details →	STL 06:02 → SEA 08:30AS 473	1h 44m Seattle	SEA 10:14 → PDX 11:21AS 3090 · flown by SkyWest	7h 19m	99%	94%
United Details →	STL 09:06 → DEN 10:30UA 2459	2h 57m Denver	DEN 13:27 → PDX 15:13UA 2455	8h 07m	99%	89%
Southwest Details →	STL 08:15 → SMF 10:15WN 4362	4h 00m Sacramento	SMF 14:15 → PDX 15:45WN 422	9h 30m	100%	88%
United Details →	STL 05:10 → DEN 06:32UA 362	1h 33m Denver	DEN 08:05 → PDX 09:47UA 1247	6h 37m	98%	85%
Delta Details →	STL 06:21 → MSP 07:57DL 1597	3h 03m Minneapolis	MSP 11:00 → PDX 12:40DL 2167	8h 19m	98%	85%
United Details →	STL 06:00 → ORD 07:30UA 2805	1h 30m Chicago	ORD 09:00 → PDX 11:38UA 1994	7h 38m	97%	83%
Southwest Details →	STL 05:40 → MDW 06:45WN 1008	3h 20m Chicago	MDW 10:05 → PDX 12:25WN 2809	8h 45m	100%	82%
Southwest Details →	STL 05:05 → DAL 06:45WN 1396	1h 10m Dallas	DAL 07:55 → PDX 09:55WN 1377	6h 50m	92%	81%
Tight connection: often missed
United Details →	STL 16:48 → DEN 18:23UA 1483	1h 07m Denver	DEN 19:30 → PDX 21:15UA 498	6h 27m	59%	47%
Delta Details →	STL 15:57 → MSP 17:40DL 4167 · flown by SkyWest	54m Minneapolis	MSP 18:34 → PDX 20:17DL 2151	6h 20m	52%	41%
United Details →	STL 19:23 → SFO 21:43UA 2482	1h 09m San Francisco	SFO 22:52 → PDX 00:50 +1UA 2384	7h 27m	38%	29%

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

ATL · 1h 15m · leaves 07:08 3%

PHX · 55m · leaves 05:45 7%

DAL · 1h 10m · leaves 05:05 8%

Afternoon and evening

DEN · 55m · leaves 16:00 60%

SFO · 1h 09m · leaves 19:23 62%

LAS · 1h 10m · leaves 19:40 78%

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 3910 STL 08:42 → DEN United UA 2455 DEN 13:27 → PDX Connection details →	3h 25m	8h 31m	100%	90%
Southwest WN 3934 STL 06:00 → LAS Alaska AS 1467 LAS 11:00 → PDX Connection details →	3h 35m	9h 20m	100%	89%
Delta DL 2363 STL 08:00 → SLC Alaska AS 3117 SLC 12:46 → PDX Connection details →	2h 34m	7h 49m	97%	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