ON TIMEBOARD
Delta Air Lines / BOS → DCA

DL 5857 on time

Delta Air Lines 5857: Boston to Washington at 12:30 p.m. (past 12 months)

On time
71%
186 flights · likely 64–77%
Cancelled
2.1%
of scheduled flights
Typical arrival
−3 min
median vs schedule
When late
+50 min
average delay
Similar flights
74%
DL, same route & hour

About 1 in 3 DL 5857 flights from Boston arrived 15+ minutes late, diverted or cancelled over the past year (29%); 2.1% were cancelled. The typical flight landed 3 minutes early.

DL 5857: BOS → DCA

Scheduled to leave Boston at 12:30 p.m. local time, operated by Republic Airways as YX 5857. Over the past year it arrived on time 71% of the time (186 flights), worse than other DL flights on the route at that hour (74%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Dec 2025: too few flights (9 flights)DecJan 2026: 66% on time (29 flights)66JanFeb 2026: too few flights (14 flights)FebMar 2026: too few flights (1 flights)MarApr 2026: 67% on time (18 flights)67AprMay 2026: 74% on time (31 flights)74MayJun 2026: 78% on time (27 flights)78JunJul 2026: 67% on time (27 flights)67JulAug 2026: 70% on time (30 flights)70Aug

By day of week

DayFlightsOn time
Monday2969%
Tuesday2861%
Wednesday2677%
Thursday2572%
Friday2770%
Saturday2488%
Sunday2763%

Why it was late

Air traffic & airport (NAS) 62%Airline (crew, maintenance, ops) 26%Late inbound plane 12%

All flights BOS → DCA · Connecting off DL 5857? Check the risk

Questions

How often is DL 5857 from BOS to DCA late?

Delta Air Lines 5857 from Boston, MA to Washington, DC arrived 15 or more minutes late, was diverted or was cancelled on 29% of 186 scheduled flights between September 2025 and August 2026. 2.1% 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 Delta Air Lines for today's flight. Method.