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 4% of the time at 8 am and 18% of the time at 3 pm.

Nonstops (seasonal or thin)


Alaska	SEA	STL	3h 57m	85%	0.3%	780	Flying now
Southwest	SEA	STL	4h 00m	74%	1.0%	103	Flying now

Best connections, one ticket

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 Seattle). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	SEA 23:05 → MDW 05:00WN 2304	2h 50m Chicago	MDW 07:50 → STL 09:10 +1WN 2900	8h 05m	98%	93%
Southwest Details →	SEA 05:15 → DEN 08:50WN 3615	1h 15m Denver	DEN 10:05 → STL 13:20WN 1753	6h 05m	96%	92%
Delta Details →	SEA 05:30 → SLC 08:30DL 1128	1h 11m Salt Lake City	SLC 09:41 → STL 13:36DL 2455	6h 06m	96%	88%
American Details →	SEA 23:56 → ORD 06:02AA 2881	1h 03m Chicago	ORD 07:05 → STL 08:31 +1AA 4104 · flown by Envoy	6h 36m	94%	88%
Delta Details →	SEA 21:45 → ATL 05:36DL 567	2h 07m Atlanta	ATL 07:43 → STL 08:19 +1DL 1571	8h 34m	98%	87%
American Details →	SEA 22:35 → PHL 06:48AA 2522	2h 12m Philadelphia	PHL 09:00 → STL 10:36 +1AA 2720	10h 00m	99%	87%
Delta Details →	SEA 23:10 → DTW 06:27DL 810	2h 23m Detroit	DTW 08:50 → STL 09:32 +1DL 2868	8h 22m	99%	86%
American Details →	SEA 21:35 → CLT 05:41AA 2793	1h 55m Charlotte	CLT 07:36 → STL 08:32 +1AA 2733	8h 57m	94%	86%
Tight connection: often missed
United Details →	SEA 08:45 → SFO 11:03UA 2831	1h 09m San Francisco	SFO 12:12 → STL 18:17UA 2090	7h 32m	44%	32%
American Details →	SEA 15:28 → ORD 22:00AA 2524	1h 00m Chicago	ORD 23:00 → STL 00:16 +1AA 1004	6h 48m	60%	31%
American Details →	SEA 15:21 → DFW 21:24AA 757	46m Dallas-Fort Worth	DFW 22:10 → STL 23:58AA 3049	6h 38m	61%	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

DEN · 1h 15m · leaves 05:15 4%

SLC · 1h 11m · leaves 05:30 4%

ORD · 1h 03m · leaves 23:56 6%

Afternoon and evening

DFW · 46m · leaves 15:21 39%

ORD · 50m · leaves 10:52 44%

DEN · 55m · leaves 14:35 90%

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 394 SEA 21:33 → MCO Southwest WN 4501 MCO 08:50 → STL Connection details →	2h 34m	10h 47m	98%	92%
Alaska AS 522 SEA 22:02 → PHL American AA 2720 PHL 09:00 → STL Connection details →	2h 47m	10h 33m	99%	91%
Delta DL 953 SEA 23:59 → MSP Southwest WN 2973 MSP 07:45 → STL Connection details →	2h 28m	7h 16m	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