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 DEN → DAL flights land within a few points of 7 in 10 on time whatever the hour.

Nonstops


Southwest	DEN	DAL	1h 55m	71%	1.2%	2,983	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 (Dallas is 1 h ahead of Denver). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	DEN 05:15 → HOU 08:40WN 1730	50m Houston	HOU 09:30 → DAL 10:35WN 14	4h 20m	94%	80%
Southwest Details →	DEN 07:20 → HOU 10:42WN 2215	48m Houston	HOU 11:30 → DAL 12:40WN 22	4h 20m	83%	69%
Southwest Details →	DEN 10:15 → HOU 13:55WN 1543	1h 05m Houston	HOU 15:00 → DAL 16:10WN 36	4h 55m	82%	62%
Southwest Details →	DEN 07:45 → SAT 10:55WN 2664	50m San Antonio	SAT 11:45 → DAL 12:55WN 4195	4h 10m	77%	62%
Southwest Details →	DEN 12:30 → HOU 16:05WN 1544	1h 25m Houston	HOU 17:30 → DAL 18:40WN 46	5h 10m	83%	60%
Southwest Details →	DEN 10:05 → STL 13:20WN 1753	55m St Louis	STL 14:15 → DAL 15:55WN 1322	4h 50m	94%	60%
Southwest Details →	DEN 12:30 → MCI 15:05WN 351	1h 50m Kansas City	MCI 16:55 → DAL 18:30WN 1323	5h 00m	98%	52%
Southwest Details →	DEN 14:30 → AUS 17:40WN 1478	1h 25m Austin	AUS 19:05 → DAL 20:10WN 2134	4h 40m	88%	47%
Tight connection: often missed
Southwest Details →	DEN 17:08 → HOU 20:45WN 1545	1h 15m Houston	HOU 22:00 → DAL 23:10WN 64	5h 02m	51%	32%
Southwest Details →	DEN 17:20 → PHX 18:15WN 1682	50m Phoenix	PHX 19:05 → DAL 23:30WN 193	5h 10m	15%	6%

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

HOU · 48m · leaves 07:20 17%

SAT · 50m · leaves 07:45 23%

Afternoon and evening

HOU · 1h 15m · leaves 17:08 49%

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 5270 DEN 13:40 → MAF Southwest WN 57 MAF 18:35 → DAL Connection details →	2h 01m	5h 15m	90%	78%
United UA 5333 DEN 10:05 → MAF Southwest WN 1277 MAF 14:40 → DAL Connection details →	1h 41m	4h 55m	84%	65%
United UA 5311 DEN 13:40 → TUL Southwest WN 4054 TUL 18:40 → DAL Connection details →	2h 11m	5h 05m	94%	60%

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