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 → HOU flights land within a few points of 4 in 5 on time whatever the hour.

Nonstops (seasonal or thin)


Southwest	SDF	HOU	2h 35m	81%	0.7%	283	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Southwest Details →	SDF 05:50 → BWI 07:25WN 4612	2h 35m Baltimore	BWI 10:00 → HOU 12:15WN 956	7h 25m	98%	83%
Southwest Details →	SDF 08:45 → MDW 09:00WN 3609	1h 10m Chicago	MDW 10:10 → HOU 12:50WN 2783	5h 05m	100%	83%
Delta Details →	SDF 06:00 → ATL 07:25DL 2407	3h 40m Atlanta	ATL 11:05 → HOU 12:11DL 1195	7h 12m	99%	82%
Southwest Details →	SDF 06:40 → MCO 08:40WN 4679	1h 00m Orlando	MCO 09:40 → HOU 11:10WN 3174	5h 30m	90%	81%
Delta Details →	SDF 11:17 → ATL 12:45DL 1374	2h 26m Atlanta	ATL 15:11 → HOU 16:23DL 2381	6h 08m	98%	76%
American Details →	SDF 06:38 → DFW 08:08AA 331	2h 43m Dallas-Fort Worth	DFW 10:51 → HOU 12:16AA 6413 · flown by SkyWest	6h 38m	95%	71%
Delta Details →	SDF 16:40 → ATL 18:19DL 3195	2h 16m Atlanta	ATL 20:35 → HOU 21:43DL 2051	6h 03m	94%	68%
American Details →	SDF 11:09 → DFW 12:30AA 3788 · flown by Envoy	1h 52m Dallas-Fort Worth	DFW 14:22 → HOU 15:44AA 5002 · flown by SkyWest	5h 36m	95%	67%
Tight connection: often missed
American Details →	SDF 19:50 → DFW 21:12AA 2519	1h 26m Dallas-Fort Worth	DFW 22:38 → HOU 23:56AA 5465 · flown by PSA	5h 06m	55%	25%
Southwest Details →	SDF 18:05 → BNA 17:55WN 1712	1h 00m Nashville	BNA 18:55 → HOU 21:02WN 534	3h 55m	45%	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

ATL · 55m · leaves 06:00 9%

MCO · 1h 00m · leaves 06:40 10%

Afternoon and evening

DFW · 1h 18m · leaves 15:52 17%

BNA · 1h 00m · leaves 18:05 55%

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.


Delta DL 2407 SDF 06:00 → ATL Southwest WN 4914 ATL 09:30 → HOU Connection details →	2h 05m	5h 35m	95%	74%
Delta DL 1374 SDF 11:17 → ATL Southwest WN 206 ATL 16:05 → HOU Connection details →	3h 20m	6h 58m	99%	63%
Delta DL 1126 SDF 18:34 → ATL Southwest WN 207 ATL 22:50 → HOU Connection details →	2h 35m	6h 31m	90%	56%

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