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 70-minute layover misses 5% of the time at 8 am and 1 time in 5 at 5 pm.

Nonstops (seasonal or thin)


Delta	SDF	BOS	2h 34m	74%	2.9%	348	Flying now
American	SDF	BOS	2h 26m	71%	1.4%	360	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


American Details →	SDF 05:04 → CLT 06:41AA 5255 · flown by PSA	2h 14m Charlotte	CLT 08:55 → BOS 11:08AA 1533	6h 04m	90%	86%
Delta Details →	SDF 06:00 → ATL 07:25DL 2407	1h 10m Atlanta	ATL 08:35 → BOS 11:14DL 2432	5h 14m	95%	85%
American Details →	SDF 06:00 → DCA 07:50AA 4549 · flown by Republic	1h 50m Washington	DCA 09:40 → BOS 11:24AA 4691 · flown by Republic	5h 24m	97%	85%
United Details →	SDF 06:00 → IAD 07:35UA 3438 · flown by Republic	1h 00m Dulles	IAD 08:35 → BOS 10:20UA 641	4h 20m	93%	83%
United Details →	SDF 07:15 → ORD 07:56UA 3422 · flown by Republic	1h 19m Chicago	ORD 09:15 → BOS 12:57UA 1117	5h 42m	95%	82%
United Details →	SDF 06:30 → EWR 08:38UA 3594 · flown by Republic	3h 21m Newark	EWR 11:59 → BOS 13:16UA 1669	6h 46m	100%	80%
Delta Details →	SDF 07:05 → ATL 08:34DL 1610	1h 26m Atlanta	ATL 10:00 → BOS 12:44DL 855	5h 39m	95%	80%
Delta Details →	SDF 08:10 → ATL 09:40DL 2299	1h 30m Atlanta	ATL 11:10 → BOS 13:47DL 862	5h 37m	93%	77%
Tight connection: often missed
United Details →	SDF 09:00 → ORD 09:38UA 3696 · flown by Republic	47m Chicago	ORD 10:25 → BOS 14:04UA 1606	5h 02m	71%	58%
Delta Details →	SDF 17:55 → MSP 19:09DL 5017 · flown by Endeavor	1h 00m Minneapolis	MSP 20:09 → BOS 23:57DL 2614	6h 02m	58%	45%
United Details →	SDF 17:50 → ORD 18:40UA 5929 · flown by SkyWest	1h 05m Chicago	ORD 19:45 → BOS 23:21UA 1032	5h 31m	74%	39%

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

ORD · 1h 19m · leaves 07:15 5%

ATL · 1h 10m · leaves 06:00 5%

IAD · 1h 00m · leaves 06:00 7%

Afternoon and evening

ORD · 1h 01m · leaves 19:55 22%

DCA · 1h 01m · leaves 14:18 39%

MSP · 1h 00m · leaves 17:55 42%

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 4549 SDF 06:00 → DCA Delta DL 5611 DCA 10:00 → BOS Connection details →	2h 10m	5h 43m	96%	80%
Southwest WN 4679 SDF 06:40 → MCO Delta DL 1580 MCO 11:20 → BOS Connection details →	2h 40m	7h 44m	98%	79%
Delta DL 5652 SDF 06:00 → LGA American AA 4367 LGA 10:30 → BOS Connection details →	2h 15m	5h 53m	97%	78%

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