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 SDF → DAL flights land within a few points of 84% on time whatever the hour.

Nonstops (seasonal or thin)


Southwest	SDF	DAL	2h 15m	84%	0.6%	350	Flying now

Best connections, any airlines

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 behind Louisville). Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	SDF 06:00 → ATL 07:25DL 2407	2h 50m Atlanta	ATL 10:15 → DAL 11:24DL 1115	6h 24m	99%	88%
Southwest Details →	SDF 05:50 → BWI 07:25WN 4612	2h 10m Baltimore	BWI 09:35 → DAL 11:45WN 931	6h 55m	98%	84%
Delta Details →	SDF 10:00 → ATL 11:24DL 1523	2h 35m Atlanta	ATL 13:59 → DAL 15:03DL 512	6h 12m	97%	80%
Delta Details →	SDF 16:40 → ATL 18:19DL 3195	2h 56m Atlanta	ATL 21:15 → DAL 22:34DL 1104	6h 54m	98%	77%
Delta Details →	SDF 13:02 → ATL 14:32DL 1481	2h 06m Atlanta	ATL 16:38 → DAL 17:55DL 2780	5h 53m	98%	74%
Southwest Details →	SDF 15:00 → HOU 16:20WN 3606	2h 40m Houston	HOU 19:00 → DAL 20:10WN 52	6h 10m	97%	72%
Southwest Details →	SDF 08:45 → MDW 09:00WN 3609	1h 00m Chicago	MDW 10:00 → DAL 12:15WN 1487	4h 30m	97%	69%
Southwest Details →	SDF 07:25 → BNA 07:15WN 3604	3h 55m Nashville	BNA 11:10 → DAL 13:05WN 487	6h 40m	100%	66%
Tight connection: often missed
Southwest Details →	SDF 15:00 → HOU 16:20WN 3606	1h 10m Houston	HOU 17:30 → DAL 18:40WN 46	4h 40m	67%	48%
Southwest Details →	SDF 18:05 → BNA 17:55WN 1712	1h 03m Nashville	BNA 18:58 → DAL 20:52WN 490	3h 48m	50%	21%

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

ATL · 47m · leaves 06:00 11%

BNA · 50m · leaves 07:25 12%

BWI · 50m · leaves 05:50 18%

Afternoon and evening

ATL · 1h 00m · leaves 18:34 18%

BNA · 1h 03m · leaves 18:05 50%

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