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 83% on time.

Nonstops (seasonal or thin)


Delta	RDU	MCI	2h 42m	85%	2.9%	348	Flying now
Southwest	RDU	MCI	–	63%	0.0%	46	Not 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 Raleigh/Durham). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	RDU 06:10 → BWI 07:15WN 3422	1h 00m Baltimore	BWI 08:15 → MCI 09:58WN 4215	4h 47m	93%	91%
American Details →	RDU 11:10 → MIA 13:19AA 2405	1h 29m Miami	MIA 14:48 → MCI 17:23AA 3939 · flown by Envoy	7h 13m	97%	87%
Delta Details →	RDU 05:20 → ATL 06:44DL 1552	1h 36m Atlanta	ATL 08:20 → MCI 09:31DL 2471	5h 11m	98%	87%
American Details →	RDU 05:16 → DFW 07:27AA 2605	2h 33m Dallas-Fort Worth	DFW 10:00 → MCI 11:44AA 3661 · flown by Envoy	7h 28m	98%	86%
Delta Details →	RDU 08:50 → ATL 10:20DL 1530	3h 04m Atlanta	ATL 13:24 → MCI 14:32DL 1443	6h 42m	99%	86%
Delta Details →	RDU 06:20 → ATL 07:48DL 1192	2h 17m Atlanta	ATL 10:05 → MCI 11:16DL 2908	5h 56m	99%	84%
Delta Details →	RDU 11:15 → ATL 12:42DL 1699	2h 42m Atlanta	ATL 15:24 → MCI 16:35DL 1660	6h 20m	99%	84%
Delta Details →	RDU 11:33 → MSP 13:20DL 2519	2h 00m Minneapolis	MSP 15:20 → MCI 16:47DL 1630	6h 15m	96%	83%
Tight connection: often missed
Delta Details →	RDU 07:10 → SLC 09:42DL 580	52m Salt Lake City	SLC 10:34 → MCI 14:00DL 2882	7h 50m	75%	66%
American Details →	RDU 17:30 → MIA 19:49AA 2406	1h 36m Miami	MIA 21:25 → MCI 23:50AA 670	7h 16m	74%	47%
Southwest Details →	RDU 19:50 → STL 20:55WN 3457	50m St Louis	STL 21:45 → MCI 22:50WN 2453	4h 00m	19%	12%

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

BNA · 1h 02m · leaves 06:38 6%

BWI · 1h 00m · leaves 06:10 7%

ATL · 1h 06m · leaves 07:30 7%

Afternoon and evening

DEN · 55m · leaves 16:55 69%

DCA · 49m · leaves 18:41 70%

STL · 50m · leaves 19:50 81%

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.


United UA 2383 RDU 08:30 → DEN Southwest WN 351 DEN 12:30 → MCI Connection details →	2h 13m	7h 35m	97%	85%
Delta DL 1192 RDU 06:20 → ATL Southwest WN 3931 ATL 10:55 → MCI Connection details →	3h 07m	6h 40m	99%	82%
Frontier F9 1741 RDU 10:14 → IAH United UA 3987 IAH 14:35 → MCI Connection details →	2h 23m	7h 33m	94%	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