ON TIMEBOARD
United Airlines / IAD → SAT

UA 1789 on time

United Airlines 1789: Washington to San Antonio at 8:15 a.m.; Raleigh to Washington at 6:00 a.m. (past 12 months). Figures below the title are for IAD → SAT, its busiest leg

On time
93%
264 flights · likely 89–95%
Cancelled
0.8%
of scheduled flights
Typical arrival
−19 min
median vs schedule
When late
+47 min
average delay
Similar flights
93%
UA, same route & hour

About 1 in 14 UA 1789 flights from Washington arrived 15+ minutes late, diverted or cancelled over the past year (7%); 0.8% were cancelled. The typical flight landed 19 minutes early.

UA 1789: IAD → SAT

Scheduled to leave Washington at 8:15 a.m. local time. Over the past year it arrived on time 93% of the time (264 flights), in line with other UA flights on the route at that hour (93%). Last seen in the data Aug 10, 2026.

Month by month

40%70%100%Sep 2025: 95% on time (21 flights)95SepOct 2025: 100% on time (24 flights)100OctNov 2025: 93% on time (30 flights)93NovDec 2025: 85% on time (27 flights)85DecJan 2026: 76% on time (17 flights)76JanFeb 2026: 89% on time (18 flights)89FebMar 2026: 100% on time (26 flights)100MarApr 2026: 95% on time (21 flights)95AprMay 2026: 100% on time (19 flights)100MayJun 2026: 92% on time (26 flights)92JunJul 2026: 89% on time (27 flights)89JulAug 2026: too few flights (8 flights)Aug

By day of week

DayFlightsOn time
Monday5094%
Tuesday3297%
Wednesday2796%
Thursday4992%
Friday4994%
Saturday13—
Sunday4489%

Why it was late

Airline (crew, maintenance, ops) 43%Late inbound plane 32%Air traffic & airport (NAS) 25%

All flights IAD → SAT · Connecting off UA 1789? Check the risk

UA 1789: RDU → IAD

Scheduled to leave Raleigh at 6:00 a.m. local time. Over the past year it arrived on time 95% of the time (198 flights), better than other UA flights on the route at that hour (91%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Feb 2026: 100% on time (17 flights)100FebMar 2026: 90% on time (31 flights)90MarApr 2026: 93% on time (30 flights)93AprMay 2026: 97% on time (30 flights)97MayJun 2026: 97% on time (30 flights)97JunJul 2026: 93% on time (29 flights)93JulAug 2026: 97% on time (31 flights)97Aug

By day of week

DayFlightsOn time
Monday2997%
Tuesday2893%
Wednesday2896%
Thursday2997%
Friday2993%
Saturday28100%
Sunday2789%

Why it was late

Airline (crew, maintenance, ops) 90%Air traffic & airport (NAS) 10%

All flights RDU → IAD · Connecting off UA 1789? Check the risk

Questions

How often is UA 1789 from IAD to SAT late?

United Airlines 1789 from Washington, DC to San Antonio, TX arrived 15 or more minutes late, was diverted or was cancelled on 7% of 264 scheduled flights between September 2025 and August 2026. 0.8% were cancelled.

How often is UA 1789 from RDU to IAD late?

United Airlines 1789 from Raleigh/Durham, NC to Washington, DC arrived 15 or more minutes late, was diverted or was cancelled on 5% of 198 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.