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 DAL → STL flights land within a few points of 77% on time whatever the hour.

Nonstops


Southwest	DAL	STL	1h 45m	77%	1.4%	1,939	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. Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	DAL 06:00 → DEN 07:00WN 1296	3h 05m Denver	DEN 10:05 → STL 13:20WN 1753	7h 20m	100%	96%
Southwest Details →	DAL 08:35 → MCI 10:10WN 1343	3h 35m Kansas City	MCI 13:45 → STL 14:50WN 2083	6h 15m	100%	86%
Southwest Details →	DAL 06:05 → MCO 09:45WN 1434	1h 25m Orlando	MCO 11:10 → STL 12:40WN 3316	6h 35m	100%	83%
Southwest Details →	DAL 08:45 → LAS 09:35WN 695	1h 35m Las Vegas	LAS 11:10 → STL 16:25WN 2369	7h 40m	96%	83%
Southwest Details →	DAL 06:00 → PHX 06:28WN 1379	1h 34m Phoenix	PHX 08:02 → STL 13:00WN 1467	7h 00m	100%	79%
Delta Details →	DAL 15:59 → ATL 19:14DL 512	3h 56m Atlanta	ATL 23:10 → STL 23:53DL 1403	7h 57m	97%	78%
Delta Details →	DAL 06:05 → ATL 09:15DL 516	2h 37m Atlanta	ATL 11:52 → STL 12:34DL 566	6h 25m	97%	77%
Southwest Details →	DAL 08:30 → HOU 09:45WN 7	3h 35m Houston	HOU 13:20 → STL 15:20WN 4642	6h 50m	99%	75%
Tight connection: often missed
Southwest Details →	DAL 17:55 → DEN 19:25WN 1303	1h 20m Denver	DEN 20:45 → STL 23:55WN 3317	6h 00m	62%	24%
Southwest Details →	DAL 15:20 → PHX 15:45WN 4129	55m Phoenix	PHX 16:40 → STL 21:35WN 3353	6h 15m	43%	24%
Southwest Details →	DAL 15:15 → AUS 16:15WN 2411	55m Austin	AUS 17:10 → STL 19:15WN 4684	4h 00m	42%	15%

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 10m · leaves 10:45 18%

HOU · 55m · leaves 08:30 19%

Afternoon and evening

DEN · 1h 20m · leaves 17:55 38%

BWI · 1h 10m · leaves 16:45 48%

PHX · 55m · leaves 15:20 57%

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 1296 DAL 06:00 → DEN United UA 652 DEN 09:35 → STL Connection details →	2h 35m	6h 42m	100%	84%
Southwest WN 1261 DAL 06:00 → ATL Delta DL 566 ATL 11:52 → STL Connection details →	2h 47m	6h 30m	98%	80%
Southwest WN 239 DAL 08:40 → DEN United UA 1639 DEN 13:25 → STL Connection details →	3h 40m	7h 53m	97%	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