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 4% of the time at 9 am and 2 times in 5 at 7 pm.

Nonstops (seasonal or thin)


Delta	BOS	MCI	3h 40m	81%	2.5%	589	Flying now
Southwest	BOS	MCI	3h 20m	56%	0.0%	57	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Southwest Details →	BOS 06:25 → DEN 08:50WN 4156	1h 10m Denver	DEN 10:00 → MCI 12:45WN 3114	7h 20m	95%	93%
Southwest Details →	BOS 05:30 → BWI 07:05WN 727	1h 10m Baltimore	BWI 08:15 → MCI 09:58WN 4215	5h 27m	95%	91%
Southwest Details →	BOS 05:25 → MDW 07:00WN 3239	1h 00m Chicago	MDW 08:00 → MCI 09:30WN 2808	5h 05m	91%	91%
Delta Details →	BOS 05:30 → ATL 08:15DL 2242	1h 50m Atlanta	ATL 10:05 → MCI 11:16DL 2908	6h 46m	100%	87%
United Details →	BOS 07:45 → DEN 10:19UA 647	3h 21m Denver	DEN 13:40 → MCI 16:22UA 586	9h 37m	100%	86%
Delta Details →	BOS 08:05 → ATL 10:49DL 923	2h 35m Atlanta	ATL 13:24 → MCI 14:32DL 1443	7h 27m	98%	85%
United Details →	BOS 05:47 → IAH 08:50UA 1409	3h 15m Houston	IAH 12:05 → MCI 14:15UA 6152 · flown by Mesa	9h 28m	98%	84%
Delta Details →	BOS 06:05 → SLC 09:18DL 859	1h 16m Salt Lake City	SLC 10:34 → MCI 14:00DL 2882	8h 55m	96%	84%
Tight connection: often missed
United Details →	BOS 16:57 → DEN 19:45UA 800	55m Denver	DEN 20:40 → MCI 23:25UA 1596	7h 28m	70%	46%
American Details →	BOS 17:05 → PHL 18:49AA 3309	1h 16m Philadelphia	PHL 20:05 → MCI 22:24AA 2901	6h 19m	69%	44%
Southwest Details →	BOS 20:00 → BNA 21:45WN 2338	50m Nashville	BNA 22:35 → MCI 00:15 +1WN 563	5h 15m	18%	8%

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

MDW · 1h 10m · leaves 07:30 4%

SLC · 1h 16m · leaves 06:05 4%

DTW · 1h 06m · leaves 05:30 5%

Afternoon and evening

DCA · 1h 04m · leaves 17:23 46%

STL · 50m · leaves 18:50 73%

BNA · 50m · leaves 20:00 82%

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 499 BOS 07:45 → DEN United UA 586 DEN 13:40 → MCI Connection details →	3h 21m	9h 37m	99%	85%
Delta DL 2242 BOS 05:30 → ATL Southwest WN 3931 ATL 10:55 → MCI Connection details →	2h 40m	7h 30m	100%	84%
United UA 647 BOS 07:45 → DEN Southwest WN 351 DEN 12:30 → MCI Connection details →	2h 11m	8h 20m	97%	84%

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