ON TIMEBOARD
United Airlines / DCA → ORD

UA 511 on time

United Airlines 511: Washington to Chicago at 1:00 p.m.; Chicago to San Francisco at 4:30 p.m. (past 12 months). Figures below the title are for DCA → ORD, its busiest leg

On time
71%
167 flights · likely 64–78%
Cancelled
3.6%
of scheduled flights
Typical arrival
−3 min
median vs schedule
When late
+110 min
average delay
Similar flights
77%
UA, same route & hour

About 1 in 3 UA 511 flights from Washington arrived 15+ minutes late, diverted or cancelled over the past year (29%); 3.6% were cancelled. The typical flight landed 3 minutes early.

UA 511: DCA → ORD

Scheduled to leave Washington at 1:00 p.m. local time. Over the past year it arrived on time 71% of the time (167 flights), worse than other UA flights on the route at that hour (77%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Mar 2026: 65% on time (23 flights)65MarApr 2026: 63% on time (30 flights)63AprMay 2026: 84% on time (31 flights)84MayJun 2026: 86% on time (29 flights)86JunJul 2026: 62% on time (26 flights)62JulAug 2026: 64% on time (28 flights)64Aug

By day of week

DayFlightsOn time
Monday2669%
Tuesday2568%
Wednesday2576%
Thursday2673%
Friday2568%
Saturday15—
Sunday2560%

Why it was late

Air traffic & airport (NAS) 59%Late inbound plane 35%Airline (crew, maintenance, ops) 6%

All flights DCA → ORD · Connecting off UA 511? Check the risk

UA 511: ORD → SFO

Scheduled to leave Chicago at 4:30 p.m. local time. Over the past year it arrived on time 61% of the time (154 flights), worse than other UA flights on the route at that hour (67%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Mar 2026: 74% on time (27 flights)74MarApr 2026: 55% on time (29 flights)55AprMay 2026: too few flights (9 flights)MayJun 2026: 52% on time (27 flights)52JunJul 2026: 65% on time (31 flights)65JulAug 2026: 61% on time (31 flights)61Aug

By day of week

DayFlightsOn time
Monday2370%
Tuesday2268%
Wednesday2264%
Thursday2335%
Friday2357%
Saturday18—
Sunday2361%

Why it was late

Late inbound plane 53%Air traffic & airport (NAS) 28%Airline (crew, maintenance, ops) 14%Severe weather 6%

All flights ORD → SFO · Connecting off UA 511? Check the risk

Questions

How often is UA 511 from DCA to ORD late?

United Airlines 511 from Washington, DC to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 29% of 167 scheduled flights between September 2025 and August 2026. 3.6% were cancelled.

How often is UA 511 from ORD to SFO late?

United Airlines 511 from Chicago, IL to San Francisco, CA arrived 15 or more minutes late, was diverted or was cancelled on 39% of 154 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.