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 90-minute layover misses 1% of the time at 7 am and 27% of the time at 6 pm.

Nonstops


United	ORD	LAS	4h 09m	81%	0.5%	2,335	Flying now
American	ORD	LAS	4h 08m	67%	2.3%	1,893	Flying now
Frontier	ORD	LAS	4h 20m	61%	5.3%	206	Flying now
Spirit	ORD	LAS	4h 01m	84%	1.5%	198	Not flying now
Southwest	ORD	LAS	4h 05m	75%	0.8%	609	Not 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 2 h behind Chicago). Layovers up to 4 hours. Pick a connection for the details.


United Details →	ORD 05:00 → DEN 06:42UA 2666	1h 23m Denver	DEN 08:05 → LAS 09:07UA 2316	6h 07m	99%	93%
United Details →	ORD 06:30 → IAD 09:24UA 1689	3h 36m Dulles	IAD 13:00 → LAS 15:09UA 2156	10h 39m	100%	89%
United Details →	ORD 06:29 → IAH 09:18UA 1799	2h 37m Houston	IAH 11:55 → LAS 13:13UA 1524	8h 44m	100%	88%
American Details →	ORD 05:00 → PHX 06:32AA 2434	3h 52m Phoenix	PHX 10:24 → LAS 11:37AA 2037	8h 37m	99%	87%
United Details →	ORD 05:30 → IAH 08:18UA 2310	2h 37m Houston	IAH 10:55 → LAS 12:14UA 1799	8h 44m	99%	86%
United Details →	ORD 08:51 → IAH 11:51UA 535	2h 29m Houston	IAH 14:20 → LAS 15:37UA 1971	8h 46m	99%	83%
United Details →	ORD 06:00 → EWR 09:12UA 2295	3h 13m Newark	EWR 12:25 → LAS 14:53UA 1864	10h 53m	100%	83%
United Details →	ORD 07:00 → LAX 09:33UA 2361	3h 39m Los Angeles	LAX 13:12 → LAS 14:34UA 2741	9h 34m	100%	82%
Tight connection: often missed
American Details →	ORD 11:40 → PHL 14:54AA 1743	1h 01m Philadelphia	PHL 15:55 → LAS 18:22AA 3040	8h 42m	75%	56%
American Details →	ORD 15:50 → DFW 18:28AA 2754	54m Dallas-Fort Worth	DFW 19:22 → LAS 20:11AA 1771	6h 21m	58%	32%
American Details →	ORD 13:25 → DFW 15:59AA 1120	59m Dallas-Fort Worth	DFW 16:58 → LAS 17:48AA 2864	6h 23m	48%	28%

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

IAH · 1h 19m · leaves 07:35 5%

IAD · 1h 08m · leaves 08:40 5%

ATL · 1h 19m · leaves 06:35 7%

Afternoon and evening

SFO · 48m · leaves 15:57 48%

DFW · 59m · leaves 13:25 52%

SLC · 59m · leaves 19:37 54%

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.


American AA 3800 ORD 08:15 → SGF Allegiant G4 85 SGF 13:21 → LAS Connection details →	3h 17m	8h 12m	100%	89%
United UA 3422 ORD 09:05 → CLE Southwest WN 1158 CLE 15:05 → LAS Connection details →	3h 24m	9h 25m	100%	83%
United UA 1994 ORD 09:00 → PDX Alaska AS 778 PDX 14:46 → LAS Connection details →	3h 08m	10h 06m	98%	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