ON TIMEBOARD
United Airlines / LAS → ORD

UA 664 on time

United Airlines 664: Las Vegas to Chicago at 7:00 a.m.; Chicago to Kansas City at 3:52 p.m. (past 12 months). Figures below the title are for LAS → ORD, its busiest leg

On time
85%
352 flights · likely 81–89%
Cancelled
0.3%
of scheduled flights
Typical arrival
−12 min
median vs schedule
When late
+93 min
average delay
Similar flights
85%
UA, same route & hour

About 1 in 7 UA 664 flights from Las Vegas arrived 15+ minutes late, diverted or cancelled over the past year (15%); 0.3% were cancelled. The typical flight landed 12 minutes early.

UA 664: LAS → ORD

Scheduled to leave Las Vegas at 7:00 a.m. local time. Over the past year it arrived on time 85% of the time (352 flights), in line with other UA flights on the route at that hour (85%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Sep 2025: 97% on time (30 flights)97SepOct 2025: 90% on time (31 flights)90OctNov 2025: 83% on time (29 flights)83NovDec 2025: 97% on time (30 flights)97DecJan 2026: 83% on time (30 flights)83JanFeb 2026: 96% on time (28 flights)96FebMar 2026: 83% on time (30 flights)83MarApr 2026: 100% on time (21 flights)100AprMay 2026: 77% on time (31 flights)77MayJun 2026: 77% on time (30 flights)77JunJul 2026: 74% on time (31 flights)74JulAug 2026: 71% on time (31 flights)71Aug

By day of week

DayFlightsOn time
Monday5391%
Tuesday4789%
Wednesday4785%
Thursday5092%
Friday5175%
Saturday5283%
Sunday5283%

Why it was late

Airline (crew, maintenance, ops) 46%Air traffic & airport (NAS) 45%Late inbound plane 9%

All flights LAS → ORD · Connecting off UA 664? Check the risk

UA 664: ORD → MCI

Scheduled to leave Chicago at 3:52 p.m. local time. Over the past year it arrived on time 60% of the time (136 flights), worse than other UA flights on the route at that hour (66%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Oct 2025: too few flights (6 flights)OctNov 2025: 63% on time (24 flights)63NovDec 2025: 53% on time (17 flights)53DecApr 2026: too few flights (1 flights)AprMay 2026: 70% on time (20 flights)70MayJun 2026: too few flights (6 flights)JunJul 2026: 65% on time (31 flights)65JulAug 2026: 45% on time (31 flights)45Aug

By day of week

DayFlightsOn time
Monday2162%
Tuesday2055%
Wednesday2040%
Thursday19—
Friday2045%
Saturday15—
Sunday2157%

Why it was late

Late inbound plane 56%Airline (crew, maintenance, ops) 26%Air traffic & airport (NAS) 15%Severe weather 3%

All flights ORD → MCI · Connecting off UA 664? Check the risk

Questions

How often is UA 664 from LAS to ORD late?

United Airlines 664 from Las Vegas, NV to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 15% of 352 scheduled flights between September 2025 and August 2026. 0.3% were cancelled.

How often is UA 664 from ORD to MCI late?

United Airlines 664 from Chicago, IL to Kansas City, MO arrived 15 or more minutes late, was diverted or was cancelled on 40% of 136 scheduled flights between September 2025 and August 2026. 1.5% were cancelled.

Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check United Airlines for today's flight. Method.