DL5666 BostonBOS · 20:05 WashingtonDCA · 22:05
DL5666 by Delta Air Lines flies from Boston (BOS) to Washington (DCA) for the Sun, Sep 6 departure.
arrived at DCA · 33 min early
Where the minutes go
last 4 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at BOS and DCA are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. For this route and airline, under conditions like today's, over the last 90 days.
Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Boston to Washington flights today
same route · Delta Air LinesIf DL5666 is cancelled, these are the other Delta Air Lines nonstop flights from Boston to Washington on the same day, with scheduled departure times in BOS local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How DL5666 actually runs
Pro Flight Search has tracked every published board update for DL5666 across the BOS and DCA boards: schedule changes, gate pushes and actual clocks. Usually lands ~5 min early. Based on 4 confirmed landings · 3/4 within 15 min of schedule. Pushes back late but makes up time in the air.
The verdict above is that record speaking, so it reflects how DL5666 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationAircraft
Recent tails: N221JQ, N218JQ.
Board clocks recorded as BOS and DCA published them.
Planning around DL5666? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Pro Flight Search — DL5666 Boston to Washington on-time performance, measured from the BOS and DCA airport boards.
https://proflightsearch.com/flight/DL5666
.