Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: airlines and hours on this route all land within a few points of 86% on time.

Nonstops (seasonal or thin)


Southwest	SDF	LAS	4h 15m	87%	0.8%	365	Flying now
Spirit	SDF	LAS	4h 05m	73%few flights	0.0%	33	Not flying now
American	SDF	LAS	–	0%few flights	0.0%	1	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Las Vegas on time. Total trip = scheduled departure to arrival, layover included (Las Vegas is 3 h behind Louisville). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	SDF 05:50 → BWI 07:25WN 4612	2h 10m Baltimore	BWI 09:35 → LAS 11:35WN 974	8h 45m	98%	86%
United Details →	SDF 06:15 → IAH 07:42UA 6266 · flown by Mesa	3h 13m Houston	IAH 10:55 → LAS 12:14UA 1799	8h 59m	98%	85%
United Details →	SDF 07:15 → ORD 07:56UA 3422 · flown by Republic	3h 04m Chicago	ORD 11:00 → LAS 13:05UA 2440	8h 50m	99%	85%
Southwest Details →	SDF 06:40 → MCO 08:40WN 4679	1h 20m Orlando	MCO 10:00 → LAS 11:45WN 4696	8h 05m	97%	85%
American Details →	SDF 06:00 → MIA 08:33AA 1325	52m Miami	MIA 09:25 → LAS 11:41AA 2010	8h 41m	89%	82%
United Details →	SDF 06:30 → EWR 08:38UA 3594 · flown by Republic	3h 47m Newark	EWR 12:25 → LAS 14:53UA 1864	11h 23m	100%	82%
United Details →	SDF 08:00 → DEN 08:59UA 1506	2h 23m Denver	DEN 11:22 → LAS 12:24UA 526	7h 24m	99%	81%
United Details →	SDF 10:05 → IAD 11:45UA 3717 · flown by Republic	1h 15m Dulles	IAD 13:00 → LAS 15:09UA 2156	8h 04m	89%	81%
Tight connection: often missed
Delta Details →	SDF 14:19 → DTW 15:46DL 5160 · flown by Endeavor	49m Detroit	DTW 16:35 → LAS 17:56DL 766	6h 37m	62%	44%
American Details →	SDF 12:00 → CLT 13:38AA 5395 · flown by PSA	47m Charlotte	CLT 14:25 → LAS 16:03AA 750	7h 03m	55%	39%
American Details →	SDF 19:50 → DFW 21:12AA 2519	1h 47m Dallas-Fort Worth	DFW 22:59 → LAS 23:48AA 2998	6h 58m	69%	33%

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

MCO · 1h 20m · leaves 06:40 3%

ATL · 1h 20m · leaves 08:10 7%

ORD · 1h 04m · leaves 07:15 8%

Afternoon and evening

MDW · 1h 05m · leaves 15:35 19%

CLT · 1h 06m · leaves 15:39 24%

DTW · 49m · leaves 14:19 38%

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.


American AA 4622 SDF 06:51 → ORD United UA 2440 ORD 11:00 → LAS Connection details →	3h 22m	9h 14m	97%	83%
United UA 1506 SDF 08:00 → DEN Southwest WN 1561 DEN 11:00 → LAS Connection details →	2h 01m	6h 55m	96%	80%
American AA 331 SDF 06:38 → DFW Frontier F9 1051 DFW 11:56 → LAS Connection details →	3h 48m	9h 19m	95%	76%

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