BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
DCABOS

Washington, DC (DCA) to Boston, MA (BOS) flight delay odds

Historically, 68.6% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 9,081 flights.

HISTORICAL ROUTE SIGNALVariable
68.6%arrived on time
20.9%30+ min late
3.9%cancelled
9,081scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late12.6%all scheduled flights
120+ minutes late4.9%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+14.8 mincompleted flights

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

Departure windowFlightsOn time30+ minCancelled
Early morning1,98885.8%6.9%3.0%
Late morning1,48380.2%11.9%2.2%
Afternoon2,78362.9%26.3%3.6%
Evening2,08754.4%32.6%5.2%
Night74061.2%23.4%7.2%

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

DayFlightsOn time30+ minCancelled
Monday1,41866.6%20.5%7.1%
Tuesday1,43672.7%16.8%3.6%
Wednesday1,39871.5%19.2%3.1%
Thursday1,38865.0%24.7%3.6%
Friday1,39165.6%24.9%2.0%
Saturday74582.3%11.1%2.1%
Sunday1,30562.8%25.1%4.8%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 flights.

AirlineFlightsOn time30+ minCancelled
Republic Airways3,98374.6%15.7%4.2%
JetBlue Airways2,63363.2%25.8%3.9%
American Airlines2,26464.1%24.8%3.0%
Envoy Air19872.2%16.7%6.1%
Delta Air Lines366.7%33.3%0.0%

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

MonthFlightsOn time30+ minCancelled
July 202575062.1%22.5%9.9%
August 202574080.9%12.7%2.2%
September 202576159.5%30.6%2.0%
October 202577463.4%27.3%2.2%
November 202573569.8%21.5%3.3%
December 202569168.9%21.6%1.3%
January 202675468.7%16.6%9.2%
February 202673065.2%19.9%8.5%
March 202680965.4%23.4%2.8%
April 202678372.7%19.7%0.4%
May 202679773.7%17.6%1.3%
June 202675773.6%17.7%4.0%

What drove reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

Airline18.9%
Late aircraft47.0%
National airspace31.3%
Weather2.8%
Security0.1%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.