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

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

76.7% of 3,551 official scheduled BOS-to-BWI flights arrived on time; 14.1% arrived at least 30 minutes late and 2.7% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

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

Which departure time was most reliable for BOS to BWI?

Among qualifying BOS-to-BWI departure window results, Early morning had the highest on-time rate: 91.2% of 1,032 flights. Night was lowest at 44.7% across 150 flights.

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%

Which weekday was most reliable for BOS to BWI?

Among qualifying BOS-to-BWI weekday results, Wednesday had the highest on-time rate: 84.1% of 497 flights. Sunday was lowest at 65.7% across 527 flights.

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%

Which airline was most reliable for BOS to BWI?

Among qualifying BOS-to-BWI airline results, Republic Airways had the highest on-time rate: 79.0% of 1,086 flights. Spirit Airlines was lowest at 68.4% across 95 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%

Which month was most reliable for BOS to BWI?

Among qualifying BOS-to-BWI month results, January 2026 had the highest on-time rate: 82.8% of 239 flights. July 2025 was lowest at 66.8% across 364 flights.

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 BOS to BWI delay minutes?

Late aircraft was the largest recorded BOS-to-BWI delay category, accounting for 52.5% of 52,901 BTS-attributed delay minutes during July 2025–June 2026.

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.