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

Connect in the morning. The same one-hour layover misses 7% of the time at 8 am and 2 times in 5 at 6 pm.

Nonstops (seasonal or thin)


American	BOS	SDF	2h 44m	86%	1.7%	360	Flying now
Delta	BOS	SDF	2h 43m	86%	1.4%	348	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Southwest Details →	BOS 05:30 → BWI 07:05WN 727	3h 40m Baltimore	BWI 10:45 → SDF 12:30WN 1297	7h 00m	100%	87%
Delta Details →	BOS 05:30 → ATL 08:15DL 2242	2h 15m Atlanta	ATL 10:30 → SDF 11:53DL 1481	6h 23m	100%	86%
United Details →	BOS 05:45 → IAD 07:23UA 1734	1h 08m Dulles	IAD 08:31 → SDF 10:23UA 3526 · flown by Republic	4h 38m	98%	84%
United Details →	BOS 06:05 → EWR 07:29UA 1833	2h 36m Newark	EWR 10:05 → SDF 12:21UA 3421 · flown by Republic	6h 16m	99%	83%
Delta Details →	BOS 12:30 → ATL 15:17DL 2779	2h 42m Atlanta	ATL 17:59 → SDF 19:24DL 2831	6h 54m	100%	83%
Southwest Details →	BOS 07:30 → MDW 09:10WN 745	3h 35m Chicago	MDW 12:45 → SDF 14:55WN 4473	7h 25m	100%	83%
Delta Details →	BOS 06:00 → LGA 07:20DL 5836 · flown by Republic	3h 45m New York	LGA 11:05 → SDF 13:32DL 5637 · flown by Republic	7h 32m	100%	82%
American Details →	BOS 05:10 → ORD 07:04AA 3324	56m Chicago	ORD 08:00 → SDF 10:35AA 4704 · flown by Republic	5h 26m	91%	82%
Tight connection: often missed
American Details →	BOS 13:01 → ORD 15:10AA 4386 · flown by Republic	52m Chicago	ORD 16:02 → SDF 18:36AA 4668 · flown by Republic	5h 37m	74%	58%
Delta Details →	BOS 12:00 → LGA 13:18DL 5854 · flown by Republic	1h 17m New York	LGA 14:35 → SDF 17:11DL 4851 · flown by Endeavor	5h 11m	72%	38%
Delta Details →	BOS 16:00 → LGA 17:30DL 5726 · flown by Republic	50m New York	LGA 18:20 → SDF 20:58DL 5636 · flown by Republic	4h 58m	61%	36%

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

IAD · 1h 08m · leaves 05:45 2%

CLT · 1h 09m · leaves 06:05 4%

ATL · 55m · leaves 05:30 5%

Afternoon and evening

MDW · 1h 10m · leaves 16:45 37%

LGA · 50m · leaves 16:00 39%

EWR · 1h 10m · leaves 17:44 51%

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 5703 BOS 06:35 → BWI Southwest WN 1297 BWI 10:45 → SDF Connection details →	2h 25m	5h 55m	98%	84%
American AA 4424 BOS 06:00 → LGA Delta DL 5637 LGA 11:05 → SDF Connection details →	3h 41m	7h 32m	100%	80%
Delta DL 5764 BOS 06:25 → EWR United UA 3421 EWR 10:05 → SDF Connection details →	2h 10m	5h 56m	97%	80%

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