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

Boston, MA (BOS) to Baltimore, MD (BWI) flight delay odds

Historically, 76.7% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 3,551 flights.

HISTORICAL ROUTE SIGNALVariable
76.7%arrived on time
14.1%30+ min late
2.7%cancelled
3,551scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.8%all scheduled flights
120+ minutes late3.2%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+6.5 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 morning1,03291.2%4.5%1.7%
Late morning48189.8%3.7%0.8%
Afternoon1,04777.4%12.2%2.7%
Evening84156.5%29.5%4.6%
Night15044.7%39.3%4.7%

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
Monday53871.4%16.0%5.0%
Tuesday51581.9%9.1%2.3%
Wednesday49784.1%10.5%1.8%
Thursday53077.9%14.5%1.7%
Friday53377.9%14.6%1.7%
Saturday41179.6%13.4%0.7%
Sunday52765.7%19.7%5.1%

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
Southwest Airlines2,37076.0%14.9%2.3%
Republic Airways1,08679.0%12.1%3.3%
Spirit Airlines9568.4%15.8%6.3%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202536466.8%20.9%6.0%
August 202531879.9%11.3%1.6%
September 202528874.0%18.4%1.4%
October 202533768.8%23.1%0.9%
November 202529079.3%12.1%4.8%
December 202527578.2%12.4%1.1%
January 202623982.8%6.7%6.3%
February 202623379.4%6.4%9.9%
March 202626680.8%8.3%1.9%
April 202632279.8%14.0%0.0%
May 202631679.4%12.0%0.0%
June 202630376.6%16.8%0.7%

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.

Airline24.8%
Late aircraft52.5%
National airspace18.8%
Weather3.8%
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.