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


Delta	RDU	AUS	3h 35m	86%	0.7%	700	Flying now
Southwest	RDU	AUS	3h 10m	80%	0.6%	521	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Southwest Details →	RDU 05:05 → HOU 06:50WN 4771	2h 35m Houston	HOU 09:25 → AUS 10:20WN 270	6h 15m	100%	92%
United Details →	RDU 06:00 → IAD 07:11UA 1789	1h 19m Dulles	IAD 08:30 → AUS 10:56UA 637	5h 56m	97%	88%
Delta Details →	RDU 05:20 → ATL 06:44DL 1552	1h 26m Atlanta	ATL 08:10 → AUS 09:30DL 2976	5h 10m	97%	86%
American Details →	RDU 06:41 → CLT 07:49AA 2420	2h 29m Charlotte	CLT 10:18 → AUS 12:11AA 1419	6h 29m	100%	84%
Delta Details →	RDU 06:20 → ATL 07:48DL 1192	3h 17m Atlanta	ATL 11:05 → AUS 12:25DL 2011	7h 06m	99%	83%
Southwest Details →	RDU 06:25 → STL 07:30WN 3435	55m St Louis	STL 08:25 → AUS 10:25WN 3884	5h 00m	93%	83%
Delta Details →	RDU 07:30 → ATL 08:59DL 2478	3h 17m Atlanta	ATL 12:16 → AUS 13:39DL 2104	7h 09m	98%	82%
Delta Details →	RDU 05:33 → DTW 07:18DL 1388	1h 46m Detroit	DTW 09:04 → AUS 11:00DL 1218	6h 27m	96%	80%
Tight connection: often missed
United Details →	RDU 17:12 → ORD 18:42UA 630	1h 16m Chicago	ORD 19:58 → AUS 22:54UA 312	6h 42m	64%	41%
American Details →	RDU 16:15 → CLT 17:34AA 2402	1h 27m Charlotte	CLT 19:01 → AUS 20:57AA 1905	5h 42m	73%	41%
Southwest Details →	RDU 19:50 → STL 20:55WN 3457	1h 00m St Louis	STL 21:55 → AUS 23:55WN 4515	5h 05m	33%	17%

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 19m · leaves 06:00 3%

DTW · 1h 13m · leaves 09:54 4%

ATL · 54m · leaves 09:58 6%

Afternoon and evening

DFW · 1h 07m · leaves 19:31 42%

BNA · 50m · leaves 21:15 45%

STL · 1h 00m · leaves 19:50 67%

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 4083 RDU 05:15 → DEN Delta DL 3876 DEN 09:35 → AUS Connection details →	2h 45m	8h 34m	98%	82%
Frontier F9 4797 RDU 06:15 → ATL Delta DL 2011 ATL 11:05 → AUS Connection details →	2h 57m	7h 11m	95%	81%
Southwest WN 3430 RDU 07:15 → MCO Delta DL 2259 MCO 12:37 → AUS Connection details →	3h 42m	8h 15m	100%	81%

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