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

Nonstops


Southwest	STL	DAL	1h 45m	77%	1.5%	1,952	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Dallas 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 20m Phoenix	PHX 08:15 → DAL 12:40WN 875	6h 55m	100%	93%
Delta Details →	STL 06:00 → ATL 08:38DL 1524	1h 37m Atlanta	ATL 10:15 → DAL 11:24DL 1115	5h 24m	99%	88%
Southwest Details →	STL 07:55 → HOU 10:00WN 3928	1h 30m Houston	HOU 11:30 → DAL 12:40WN 22	4h 45m	100%	84%
Southwest Details →	STL 05:20 → HOU 07:25WN 3919	2h 05m Houston	HOU 09:30 → DAL 10:35WN 14	5h 15m	100%	82%
Delta Details →	STL 09:24 → ATL 12:02DL 1571	1h 57m Atlanta	ATL 13:59 → DAL 15:03DL 512	5h 48m	98%	80%
Delta Details →	STL 15:57 → ATL 18:37DL 2700	2h 38m Atlanta	ATL 21:15 → DAL 22:34DL 1104	6h 37m	97%	75%
Southwest Details →	STL 08:10 → SAT 10:15WN 3978	1h 30m San Antonio	SAT 11:45 → DAL 12:55WN 4195	4h 45m	92%	74%
Delta Details →	STL 10:51 → ATL 13:25DL 1400	3h 13m Atlanta	ATL 16:38 → DAL 17:55DL 2780	7h 04m	98%	74%
Tight connection: often missed
Southwest Details →	STL 15:25 → LGA 18:55WN 4962	1h 05m New York	LGA 20:00 → DAL 22:45WN 4650	7h 25m	71%	30%
Southwest Details →	STL 13:20 → DCA 16:20WN 2084	1h 00m Washington	DCA 17:20 → DAL 19:30WN 1403	6h 10m	58%	15%
Southwest Details →	STL 16:25 → ATL 19:00WN 3882	50m Atlanta	ATL 19:50 → DAL 21:00WN 196	4h 35m	32%	14%

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 20m · leaves 05:45 0%

MSY · 55m · leaves 08:25 6%

MCO · 1h 00m · leaves 05:05 9%

Afternoon and evening

LGA · 1h 05m · leaves 15:25 29%

ATL · 50m · leaves 16:25 68%

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.


United UA 362 STL 05:10 → DEN Southwest WN 1518 DEN 10:05 → DAL Connection details →	3h 33m	8h 00m	100%	72%
American AA 858 STL 05:10 → CLT Southwest WN 148 CLT 10:35 → DAL Connection details →	2h 32m	6h 55m	98%	71%
American AA 2574 STL 08:01 → PHX Southwest WN 3255 PHX 10:55 → DAL Connection details →	1h 38m	7h 19m	81%	58%

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