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 4% of the time at 7 am and 42% of the time at 8 pm.

Nonstops


United	RDU	DEN	4h 03m	87%	0.5%	745	Flying now
Frontier	RDU	DEN	4h 10m	82%	1.4%	291	Flying now
Southwest	RDU	DEN	3h 50m	76%	1.0%	709	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Denver on time. Total trip = scheduled departure to arrival, layover included (Denver is 2 h behind Raleigh/Durham). Layovers up to 4 hours. Pick a connection for the details.


United Details →	RDU 06:00 → IAD 07:11UA 1789	3h 02m Dulles	IAD 10:13 → DEN 12:05UA 1865	8h 05m	100%	92%
American Details →	RDU 05:01 → CLT 06:00AA 1903	1h 39m Charlotte	CLT 07:39 → DEN 09:10AA 1754	6h 09m	98%	89%
American Details →	RDU 05:01 → MIA 07:12AA 1088	1h 45m Miami	MIA 08:57 → DEN 11:19AA 1739	8h 18m	96%	89%
United Details →	RDU 16:51 → IAH 18:58UA 2407	3h 12m Houston	IAH 22:10 → DEN 23:57UA 1066	9h 06m	98%	87%
Delta Details →	RDU 07:30 → ATL 08:59DL 2478	3h 51m Atlanta	ATL 12:50 → DEN 14:04DL 957	8h 34m	98%	87%
Southwest Details →	RDU 06:25 → STL 07:30WN 3435	1h 12m St Louis	STL 08:42 → DEN 10:02WN 3910	5h 37m	95%	85%
Delta Details →	RDU 07:10 → SLC 09:42DL 580	3h 38m Salt Lake City	SLC 13:20 → DEN 14:56DL 1623	9h 46m	100%	85%
Southwest Details →	RDU 06:10 → BWI 07:15WN 3422	2h 25m Baltimore	BWI 09:40 → DEN 11:25WN 275	7h 15m	100%	84%
Tight connection: often missed
United Details →	RDU 17:12 → ORD 18:42UA 630	1h 18m Chicago	ORD 20:00 → DEN 22:01UA 767	6h 49m	65%	44%
American Details →	RDU 19:12 → ORD 21:06AA 4492 · flown by Republic	1h 28m Chicago	ORD 22:34 → DEN 00:17 +1AA 1387	7h 04m	72%	36%
American Details →	RDU 16:15 → CLT 17:34AA 2402	58m Charlotte	CLT 18:32 → DEN 20:17AA 1736	6h 02m	63%	30%

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 04m · leaves 06:00 4%

DTW · 1h 06m · leaves 09:54 5%

EWR · 1h 20m · leaves 07:00 5%

Afternoon and evening

DFW · 1h 02m · leaves 19:31 48%

MDW · 57m · leaves 19:28 51%

JFK · 48m · leaves 17:44 63%

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.


Southwest WN 3430 RDU 07:15 → MCO United UA 1520 MCO 12:50 → DEN Connection details →	3h 55m	9h 36m	100%	93%
Delta DL 4921 RDU 07:00 → AUS United UA 1541 AUS 12:55 → DEN Connection details →	3h 44m	9h 14m	98%	92%
Delta DL 2538 RDU 06:00 → MSP United UA 2232 MSP 11:34 → DEN Connection details →	3h 48m	8h 45m	98%	91%

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