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 13% of the time at 11 am and 58% of the time at 7 pm.

Nonstops


United	IAD	LAS	5h 09m	89%	0.5%	978	Flying now
Frontier	IAD	LAS	4h 58m	66%	0.0%	99	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	IAD 06:30 → IAH 08:39UA 1935	3h 16m Houston	IAH 11:55 → LAS 13:13UA 1524	9h 43m	100%	88%
United Details →	IAD 06:10 → ORD 07:27UA 2070	3h 33m Chicago	ORD 11:00 → LAS 13:05UA 2440	9h 55m	100%	87%
United Details →	IAD 06:33 → EWR 07:52UA 2147	1h 08m Newark	EWR 09:00 → LAS 11:28UA 1631	7h 55m	97%	84%
United Details →	IAD 08:40 → IAH 10:59UA 1524	3h 21m Houston	IAH 14:20 → LAS 15:37UA 1971	9h 57m	99%	83%
United Details →	IAD 07:00 → LAX 09:26UA 325	3h 46m Los Angeles	LAX 13:12 → LAS 14:34UA 2741	10h 34m	100%	83%
United Details →	IAD 08:29 → EWR 09:55UA 2396	2h 30m Newark	EWR 12:25 → LAS 14:53UA 1864	9h 24m	99%	83%
United Details →	IAD 06:30 → DEN 08:22UA 2031	3h 00m Denver	DEN 11:22 → LAS 12:24UA 526	8h 54m	100%	83%
American Details →	IAD 06:33 → CLT 08:00AA 1216	3h 26m Charlotte	CLT 11:26 → LAS 13:06AA 2038	9h 33m	99%	81%
Tight connection: often missed
United Details →	IAD 17:42 → ORD 18:50UA 2497	1h 00m Chicago	ORD 19:50 → LAS 21:59UA 2242	7h 17m	48%	37%
American Details →	IAD 19:31 → DFW 21:50AA 1904	1h 09m Dallas-Fort Worth	DFW 22:59 → LAS 23:48AA 2998	7h 17m	55%	27%
United Details →	IAD 17:42 → EWR 19:10UA 1831	49m Newark	EWR 19:59 → LAS 22:38UA 1800	7h 56m	42%	23%

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

MSP · 1h 18m · leaves 06:00 6%

DTW · 1h 19m · leaves 06:00 12%

EWR · 59m · leaves 08:29 12%

Afternoon and evening

DFW · 1h 09m · leaves 19:31 45%

ORD · 1h 00m · leaves 17:42 52%

EWR · 49m · leaves 17:42 58%

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 367 IAD 22:21 → SFO Southwest WN 4231 SFO 05:00 → LAS Connection details →	3h 45m	11h 14m	99%	89%
United UA 2054 IAD 18:00 → SAN Southwest WN 3510 SAN 22:40 → LAS Connection details →	2h 17m	9h 12m	93%	86%
United UA 2031 IAD 06:30 → DEN Southwest WN 1561 DEN 11:00 → LAS Connection details →	2h 38m	8h 25m	100%	83%

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