ON TIMEBOARD
United Airlines / SFO → ORD

UA 2091 on time

United Airlines 2091: San Francisco to Chicago at 6:00 a.m.; Chicago to Raleigh at 2:13 p.m. (past 12 months). Figures below the title are for SFO → ORD, its busiest leg

On time
92%
340 flights · likely 88–94%
Cancelled
0.0%
of scheduled flights
Typical arrival
−16 min
median vs schedule
When late
+54 min
average delay
Similar flights
92%
UA, same route & hour

About 1 in 12 UA 2091 flights from San Francisco arrived 15+ minutes late, diverted or cancelled over the past year (8%); 0.0% were cancelled. The typical flight landed 16 minutes early.

UA 2091: SFO → ORD

Scheduled to leave San Francisco at 6:00 a.m. local time. Over the past year it arrived on time 92% of the time (340 flights), in line with other UA flights on the route at that hour (92%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Sep 2025: too few flights (6 flights)SepOct 2025: 94% on time (31 flights)94OctNov 2025: 87% on time (30 flights)87NovDec 2025: 90% on time (31 flights)90DecJan 2026: 90% on time (31 flights)90JanFeb 2026: 100% on time (27 flights)100FebMar 2026: 84% on time (31 flights)84MarApr 2026: 90% on time (30 flights)90AprMay 2026: 97% on time (31 flights)97MayJun 2026: 97% on time (30 flights)97JunJul 2026: 87% on time (31 flights)87JulAug 2026: 94% on time (31 flights)94Aug

By day of week

DayFlightsOn time
Monday4992%
Tuesday4894%
Wednesday4796%
Thursday4992%
Friday4986%
Saturday4994%
Sunday4990%

Why it was late

Air traffic & airport (NAS) 72%Airline (crew, maintenance, ops) 19%Late inbound plane 9%

All flights SFO → ORD · Connecting off UA 2091? Check the risk

UA 2091: ORD → RDU

Scheduled to leave Chicago at 2:13 p.m. local time. Over the past year it arrived on time 75% of the time (194 flights), in line with other UA flights on the route at that hour (76%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Feb 2026: too few flights (14 flights)FebMar 2026: 67% on time (27 flights)67MarApr 2026: 83% on time (30 flights)83AprMay 2026: 84% on time (31 flights)84MayJun 2026: 80% on time (30 flights)80JunJul 2026: 65% on time (31 flights)65JulAug 2026: 58% on time (31 flights)58Aug

By day of week

DayFlightsOn time
Monday2976%
Tuesday2882%
Wednesday2882%
Thursday2972%
Friday2969%
Saturday2268%
Sunday2972%

Why it was late

Late inbound plane 51%Air traffic & airport (NAS) 30%Airline (crew, maintenance, ops) 14%Severe weather 5%

All flights ORD → RDU · Connecting off UA 2091? Check the risk

Questions

How often is UA 2091 from SFO to ORD late?

United Airlines 2091 from San Francisco, CA to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 8% of 340 scheduled flights between September 2025 and August 2026. 0.0% were cancelled.

How often is UA 2091 from ORD to RDU late?

United Airlines 2091 from Chicago, IL to Raleigh/Durham, NC arrived 15 or more minutes late, was diverted or was cancelled on 25% of 194 scheduled flights between September 2025 and August 2026. 0.0% 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.