ON TIMEBOARD
United Airlines / DEN → PDX

UA 1337 on time

United Airlines 1337: Denver to Portland at 4:00 p.m.; San Diego to Denver at 11:00 a.m. (past 12 months). Figures below the title are for DEN → PDX, its busiest leg

On time
83%
327 flights · likely 79–87%
Cancelled
0.3%
of scheduled flights
Typical arrival
−6 min
median vs schedule
When late
+73 min
average delay
Similar flights
82%
UA, same route & hour

About 1 in 6 UA 1337 flights from Denver arrived 15+ minutes late, diverted or cancelled over the past year (17%); 0.3% were cancelled. The typical flight landed 6 minutes early.

UA 1337: DEN → PDX

Scheduled to leave Denver at 4:00 p.m. local time. Over the past year it arrived on time 83% of the time (327 flights), in line with other UA flights on the route at that hour (82%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Sep 2025: 92% on time (24 flights)92SepOct 2025: too few flights (6 flights)OctNov 2025: 83% on time (29 flights)83NovDec 2025: 81% on time (31 flights)81DecJan 2026: 89% on time (27 flights)89JanFeb 2026: 78% on time (27 flights)78FebMar 2026: 90% on time (31 flights)90MarApr 2026: 100% on time (30 flights)100AprMay 2026: 81% on time (31 flights)81MayJun 2026: 70% on time (30 flights)70JunJul 2026: 73% on time (30 flights)73JulAug 2026: 84% on time (31 flights)84Aug

By day of week

DayFlightsOn time
Monday4980%
Tuesday4885%
Wednesday4871%
Thursday4689%
Friday4783%
Saturday4183%
Sunday4892%

Why it was late

Airline (crew, maintenance, ops) 47%Late inbound plane 36%Air traffic & airport (NAS) 15%Severe weather 2%

All flights DEN → PDX · Connecting off UA 1337? Check the risk

UA 1337: SAN → DEN

Scheduled to leave San Diego at 11:00 a.m. local time. Over the past year it arrived on time 89% of the time (275 flights), in line with other UA flights on the route at that hour (88%). Last seen in the data Jun 24, 2026.

Month by month

40%70%100%Sep 2024: 95% on time (20 flights)95SepAug 2025: too few flights (13 flights)AugSep 2025: 90% on time (30 flights)90SepOct 2025: 94% on time (31 flights)94OctNov 2025: 90% on time (29 flights)90NovDec 2025: 84% on time (31 flights)84DecJan 2026: 77% on time (31 flights)77JanFeb 2026: too few flights (11 flights)FebMar 2026: 85% on time (27 flights)85MarApr 2026: 93% on time (30 flights)93AprMay 2026: 100% on time (31 flights)100MayJun 2026: 88% on time (24 flights)88Jun

By day of week

DayFlightsOn time
Monday4095%
Tuesday4095%
Wednesday4095%
Thursday3879%
Friday3990%
Saturday3987%
Sunday3982%

Why it was late

Late inbound plane 58%Air traffic & airport (NAS) 23%Airline (crew, maintenance, ops) 15%Severe weather 4%

All flights SAN → DEN · Connecting off UA 1337? Check the risk

Questions

How often is UA 1337 from DEN to PDX late?

United Airlines 1337 from Denver, CO to Portland, OR arrived 15 or more minutes late, was diverted or was cancelled on 17% of 327 scheduled flights between September 2025 and August 2026. 0.3% were cancelled.

How often is UA 1337 from SAN to DEN late?

United Airlines 1337 from San Diego, CA to Denver, CO arrived 15 or more minutes late, was diverted or was cancelled on 11% of 275 scheduled flights between September 2025 and August 2026. 0.4% 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.