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 → MIA flights land within a few points of 72% on time whatever the hour.

Nonstops (seasonal or thin)


Southwest	DAL	MIA	2h 40m	72%	2.2%	417	Flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Miami on time. Total trip = scheduled departure to arrival, layover included (Miami is 1 h ahead of Dallas). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	DAL 06:05 → MCI 07:35WN 4631	2h 25m Kansas City	MCI 10:00 → MIA 14:10WN 2575	7h 05m	98%	94%
Southwest + Americantwo ticketsDetails →	DAL 06:20 → MSY 07:45WN 1466	2h 13m New Orleans	MSY 09:58 → MIA 12:58AA 2168	5h 38m	98%	82%
Southwest Details →	DAL 06:00 → BWI 09:55WN 1280	1h 50m Baltimore	BWI 11:45 → MIA 14:20WN 4737	7h 20m	98%	79%
Southwest + Deltatwo ticketsDetails →	DAL 06:00 → ATL 09:05WN 1261	1h 55m Atlanta	ATL 11:00 → MIA 13:04DL 1332	6h 04m	95%	77%
Southwest + Americantwo ticketsDetails →	DAL 06:10 → DCA 10:00WN 3351	1h 55m Washington	DCA 11:55 → MIA 14:38AA 1627	7h 28m	98%	74%
Southwest + Frontiertwo ticketsDetails →	DAL 19:10 → DEN 20:30WN 1304	3h 10m Denver	DEN 23:40 → MIA 05:51 +1F9 1280	9h 41m	95%	72%
Delta Details →	DAL 06:05 → ATL 09:15DL 516	3h 39m Atlanta	ATL 12:54 → MIA 14:55DL 1579	7h 50m	98%	71%
Southwest + Americantwo ticketsDetails →	DAL 07:35 → AUS 08:40WN 1265	2h 05m Austin	AUS 10:45 → MIA 14:39AA 1417	6h 04m	95%	71%
Tight connection: often missed
Delta Details →	DAL 15:59 → ATL 19:14DL 512	1h 02m Atlanta	ATL 20:16 → MIA 22:17DL 1588	5h 18m	73%	47%
Delta Details →	DAL 18:40 → ATL 22:00DL 2780	49m Atlanta	ATL 22:49 → MIA 00:51 +1DL 1589	5h 11m	70%	46%

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

STL · 1h 20m · leaves 09:40 10%

BNA · 1h 20m · leaves 08:20 15%

Afternoon and evening

ATL · 49m · leaves 18:40 30%

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.

The table above includes two-ticket connections (marked “two tickets”), held to the 90-minute minimum. One ticket only →

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