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 1% of the time at 9 am and 1 time in 5 at 8 pm.

Nonstops (seasonal or thin)


Alaska	PDX	STL	4h 00m	83%	1.2%	80	Flying now
Southwest	PDX	STL	3h 45m	79%few flights	0.0%	34	Not flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

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


Southwest Details →	PDX 23:30 → MDW 05:20WN 3203	2h 30m Chicago	MDW 07:50 → STL 09:10 +1WN 2900	7h 40m	100%	93%
Delta Details →	PDX 05:45 → SLC 08:39DL 1270	1h 02m Salt Lake City	SLC 09:41 → STL 13:36DL 2455	5h 51m	99%	90%
Southwest Details →	PDX 05:00 → LAS 07:10WN 344	4h 00m Las Vegas	LAS 11:10 → STL 16:25WN 2369	9h 25m	100%	90%
Alaska Details →	PDX 05:00 → SEA 05:53AS 2431 · flown by Horizon	2h 02m Seattle	SEA 07:55 → STL 13:52AS 618	6h 52m	100%	90%
Alaska + Americantwo ticketsDetails →	PDX 22:59 → ORD 05:00AS 376	2h 05m Chicago	ORD 07:05 → STL 08:31 +1AA 4104 · flown by Envoy	7h 33m	96%	89%
United + Southwesttwo ticketsDetails →	PDX 05:00 → DEN 08:31UA 459	1h 34m Denver	DEN 10:05 → STL 13:20WN 1753	6h 20m	93%	89%
Southwest + Unitedtwo ticketsDetails →	PDX 07:30 → DEN 11:00WN 4099	2h 25m Denver	DEN 13:25 → STL 16:33UA 1639	7h 03m	100%	87%
Delta + Southwesttwo ticketsDetails →	PDX 00:33 → MSP 05:49DL 2359	1h 56m Minneapolis	MSP 07:45 → STL 09:15WN 2973	6h 42m	95%	87%
Tight connection: often missed
Delta Details →	PDX 11:55 → DTW 19:08DL 2171	52m Detroit	DTW 20:00 → STL 20:39DL 1541	6h 44m	72%	55%
Southwest Details →	PDX 10:00 → SMF 11:25WN 300	55m Sacramento	SMF 12:20 → STL 18:00WN 920	6h 00m	67%	48%
Southwest Details →	PDX 14:45 → DEN 18:20WN 2519	55m Denver	DEN 19:15 → STL 22:28WN 1756	5h 45m	42%	16%

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

SLC · 1h 02m · leaves 05:45 1%

DEN · 1h 04m · leaves 05:00 3%

MSP · 1h 11m · leaves 00:33 5%

Afternoon and evening

DTW · 52m · leaves 11:55 28%

ORD · 55m · leaves 10:46 29%

DEN · 55m · leaves 14:45 58%

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