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United Airlines / DEN → SFO

UA 1506 on time

United Airlines 1506: Denver to San Francisco at 9:43 a.m.; San Francisco to Los Angeles at 12:15 p.m. (past 12 months). Figures below the title are for DEN → SFO, its busiest leg

On time
48%
201 flights · likely 41–55%
Cancelled
0.5%
of scheduled flights
Typical arrival
+16 min
median vs schedule
When late
+40 min
average delay
Similar flights
53%
UA, same route & hour

About 5 in 10 UA 1506 flights from Denver arrived 15+ minutes late, diverted or cancelled over the past year (52%); 0.5% were cancelled. The typical flight landed 16 minutes late.

UA 1506: DEN → SFO

Scheduled to leave Denver at 9:43 a.m. local time. Over the past year it arrived on time 48% of the time (201 flights), worse than other UA flights on the route at that hour (53%). Last seen in the data Aug 31, 2026.

Month by month

20%60%100%Feb 2026: 82% on time (17 flights)82FebMar 2026: 77% on time (31 flights)77MarApr 2026: 33% on time (30 flights)33AprMay 2026: 35% on time (31 flights)35MayJun 2026: 30% on time (30 flights)30JunJul 2026: 35% on time (31 flights)35JulAug 2026: 58% on time (31 flights)58Aug

By day of week

DayFlightsOn time
Monday2934%
Tuesday2843%
Wednesday2850%
Thursday2945%
Friday2948%
Saturday2959%
Sunday2959%

Why it was late

Air traffic & airport (NAS) 74%Late inbound plane 17%Airline (crew, maintenance, ops) 8%

All flights DEN → SFO · Connecting off UA 1506? Check the risk

UA 1506: SFO → LAX

Scheduled to leave San Francisco at 12:15 p.m. local time. Over the past year it arrived on time 69% of the time (172 flights), worse than 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: 47% on time (17 flights)47FebMar 2026: too few flights (7 flights)MarApr 2026: 54% on time (26 flights)54AprMay 2026: 65% on time (31 flights)65MayJun 2026: 79% on time (29 flights)79JunJul 2026: 90% on time (31 flights)90JulAug 2026: 65% on time (31 flights)65Aug

By day of week

DayFlightsOn time
Monday2662%
Tuesday2576%
Wednesday2564%
Thursday2552%
Friday2572%
Saturday2186%
Sunday2576%

Why it was late

Late inbound plane 54%Airline (crew, maintenance, ops) 28%Air traffic & airport (NAS) 18%

All flights SFO → LAX · Connecting off UA 1506? Check the risk

Questions

How often is UA 1506 from DEN to SFO late?

United Airlines 1506 from Denver, CO to San Francisco, CA arrived 15 or more minutes late, was diverted or was cancelled on 52% of 201 scheduled flights between September 2025 and August 2026. 0.5% were cancelled.

How often is UA 1506 from SFO to LAX late?

United Airlines 1506 from San Francisco, CA to Los Angeles, CA arrived 15 or more minutes late, was diverted or was cancelled on 31% of 172 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.