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 8% of the time at 10 am and 1 time in 4 at 10 pm.

Nonstops (seasonal or thin)


Southwest	STL	SAN	4h 00m	79%	0.2%	473	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	STL 09:06 → DEN 10:30UA 2459	3h 00m Denver	DEN 13:30 → SAN 14:55UA 1302	7h 49m	99%	85%
Southwest Details →	STL 05:45 → DEN 07:00WN 3909	1h 15m Denver	DEN 08:15 → SAN 09:40WN 1699	5h 55m	97%	83%
Delta Details →	STL 06:00 → ATL 08:38DL 1524	3h 15m Atlanta	ATL 11:53 → SAN 13:21DL 540	9h 21m	99%	83%
United Details →	STL 05:10 → DEN 06:32UA 362	1h 11m Denver	DEN 07:43 → SAN 09:05UA 2309	5h 55m	93%	82%
United Details →	STL 06:14 → IAH 08:31UA 6283 · flown by Mesa	3h 29m Houston	IAH 12:00 → SAN 13:21UA 2399	9h 07m	99%	81%
United Details →	STL 06:00 → ORD 07:30UA 2805	1h 16m Chicago	ORD 08:46 → SAN 11:21UA 660	7h 21m	97%	81%
Delta Details →	STL 06:21 → MSP 07:57DL 1597	3h 41m Minneapolis	MSP 11:38 → SAN 13:29DL 2125	9h 08m	99%	80%
United Details →	STL 07:20 → ORD 09:00UA 4423 · flown by GoJet	4h 00m Chicago	ORD 13:00 → SAN 15:25UA 2683	10h 05m	99%	79%
Tight connection: often missed
Delta Details →	STL 15:57 → MSP 17:40DL 4167 · flown by SkyWest	1h 10m Minneapolis	MSP 18:50 → SAN 20:36DL 2145	6h 43m	71%	52%
United Details →	STL 16:48 → DEN 18:23UA 1483	57m Denver	DEN 19:20 → SAN 20:46UA 540	5h 58m	54%	35%
American Details →	STL 17:13 → DFW 19:15AA 2712	2h 19m Dallas-Fort Worth	DFW 21:34 → SAN 22:37AA 1011	7h 24m	67%	20%

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

PHX · 1h 00m · leaves 05:45 2%

DEN · 1h 15m · leaves 05:45 3%

LAS · 1h 15m · leaves 06:00 6%

Afternoon and evening

DEN · 57m · leaves 16:48 46%

SFO · 59m · leaves 19:23 74%

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 1302 DEN 13:30 → SAN Connection details →	3h 28m	8h 13m	100%	87%
Southwest WN 4312 STL 11:30 → DEN United UA 1281 DEN 15:55 → SAN Connection details →	3h 15m	7h 50m	96%	82%
Southwest WN 236 STL 10:00 → ATL Delta DL 843 ATL 15:36 → SAN Connection details →	3h 01m	9h 01m	96%	79%

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