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 3% of the time at 7 am and 3 times in 5 at 10 pm.

Nonstops


United	LAS	IAD	4h 30m	89%	0.6%	980	Flying now
Frontier	LAS	IAD	4h 35m	65%	0.0%	98	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Dulles on time. Total trip = scheduled departure to arrival, layover included (Dulles is 3 h ahead of Las Vegas). Layovers up to 4 hours. Pick a connection for the details.


United Details →	LAS 23:30 → ORD 05:11UA 2102	1h 19m Chicago	ORD 06:30 → IAD 09:24 +1UA 1689	6h 54m	95%	94%
United Details →	LAS 23:59 → ORD 05:40UA 726	3h 00m Chicago	ORD 08:40 → IAD 11:52 +1UA 2277	8h 53m	100%	92%
United Details →	LAS 06:00 → LAX 07:14UA 2039	3h 25m Los Angeles	LAX 10:39 → IAD 18:48UA 2667	9h 48m	100%	90%
United Details →	LAS 18:10 → DEN 21:11UA 1291	2h 48m Denver	DEN 23:59 → IAD 05:27 +1UA 1924	8h 17m	96%	89%
United Details →	LAS 14:15 → LAX 15:35UA 2184	1h 14m Los Angeles	LAX 16:49 → IAD 00:55 +1UA 1573	7h 40m	93%	85%
United Details →	LAS 11:30 → SFO 13:12UA 574	3h 22m San Francisco	SFO 16:34 → IAD 00:55 +1UA 1453	10h 25m	98%	85%
Delta Details →	LAS 00:33 → ATL 07:18DL 857	2h 32m Atlanta	ATL 09:50 → IAD 11:39DL 1444	8h 05m	100%	84%
Delta Details →	LAS 22:00 → ATL 05:00DL 879	2h 43m Atlanta	ATL 07:43 → IAD 09:26 +1DL 1324	8h 28m	100%	84%
Tight connection: often missed
United Details →	LAS 13:34 → SFO 15:16UA 1799	1h 18m San Francisco	SFO 16:34 → IAD 00:55 +1UA 1453	8h 21m	72%	62%
American Details →	LAS 12:47 → DFW 17:49AA 3285	55m Dallas-Fort Worth	DFW 18:44 → IAD 22:46AA 1132	7h 05m	64%	29%
United Details →	LAS 19:52 → SFO 21:34UA 1267	1h 01m San Francisco	SFO 22:35 → IAD 06:58 +1UA 2837	8h 06m	41%	27%

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

LAX · 1h 01m · leaves 06:00 3%

IAH · 1h 02m · leaves 06:00 4%

ORD · 1h 19m · leaves 23:30 5%

Afternoon and evening

DFW · 55m · leaves 12:47 36%

LAX · 46m · leaves 20:31 36%

SFO · 1h 01m · leaves 19:52 59%

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 2248 LAS 19:05 → IND United UA 3997 IND 05:35 → IAD Connection details →	3h 50m	9h 14m	98%	95%
Southwest WN 4590 LAS 22:50 → MCO United UA 276 MCO 08:55 → IAD Connection details →	2h 30m	9h 24m	98%	94%
Southwest WN 739 LAS 07:40 → SEA United UA 2131 SEA 13:00 → IAD Connection details →	2h 35m	10h 26m	100%	93%

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