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

No clear winner: Southwest’s STL → SAT flights land within a few points of 82% on time whatever the hour.

Nonstops (seasonal or thin)


Southwest	STL	SAT	2h 20m	82%	0.2%	548	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach San Antonio on time. Total trip = scheduled departure to arrival, layover included. Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	STL 05:45 → PHX 06:55WN 3967	1h 00m Phoenix	PHX 07:55 → SAT 12:05WN 4081	6h 20m	98%	94%
United Details →	STL 05:10 → DEN 06:32UA 362	3h 03m Denver	DEN 09:35 → SAT 12:43UA 2625	7h 33m	100%	91%
United Details →	STL 09:06 → DEN 10:30UA 2459	3h 14m Denver	DEN 13:44 → SAT 16:55UA 1022	7h 49m	99%	89%
United Details →	STL 06:00 → ORD 07:30UA 2805	1h 55m Chicago	ORD 09:25 → SAT 12:29UA 490	6h 29m	97%	83%
Delta Details →	STL 08:49 → MSP 10:30DL 5325 · flown by Endeavor	3h 50m Minneapolis	MSP 14:20 → SAT 17:11DL 2580	8h 22m	99%	82%
Delta Details →	STL 06:00 → ATL 08:38DL 1524	3h 37m Atlanta	ATL 12:15 → SAT 13:38DL 1408	7h 41m	99%	82%
United Details →	STL 11:10 → IAH 13:25UA 6213 · flown by Mesa	3h 10m Houston	IAH 16:35 → SAT 17:44UA 5379 · flown by SkyWest	6h 34m	99%	81%
Southwest Details →	STL 05:45 → DEN 07:00WN 3909	2h 20m Denver	DEN 09:20 → SAT 12:25WN 3149	6h 40m	98%	80%
Tight connection: often missed
Delta Details →	STL 15:57 → MSP 17:40DL 4167 · flown by SkyWest	55m Minneapolis	MSP 18:35 → SAT 21:32DL 2773	5h 35m	53%	37%
American Details →	STL 17:13 → DFW 19:15AA 2712	1h 33m Dallas-Fort Worth	DFW 20:48 → SAT 22:00AA 1406	4h 47m	49%	25%
American Details →	STL 19:22 → DFW 21:20AA 2491	1h 30m Dallas-Fort Worth	DFW 22:50 → SAT 23:58AA 1599	4h 36m	61%	22%

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%

ATL · 1h 04m · leaves 06:00 4%

IAH · 1h 16m · leaves 08:35 6%

Afternoon and evening

ATL · 1h 16m · leaves 18:58 14%

IAH · 50m · leaves 18:30 28%

MSP · 55m · leaves 15:57 47%

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 1022 DEN 13:44 → SAT Connection details →	3h 42m	8h 13m	100%	90%
Southwest WN 3909 STL 05:45 → DEN United UA 2625 DEN 09:35 → SAT Connection details →	2h 35m	6h 58m	97%	89%
United UA 362 STL 05:10 → DEN Southwest WN 3149 DEN 09:20 → SAT Connection details →	2h 48m	7h 15m	100%	80%

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