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

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

72.8% of 3,556 official scheduled BWI-to-BOS flights arrived on time; 17.6% 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
72.8%arrived on time
17.6%30+ min late
2.7%cancelled
3,556scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late9.1%all scheduled flights
120+ minutes late3.3%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+9.1 mincompleted flights

Which departure time was most reliable for BWI to BOS?

Among qualifying BWI-to-BOS departure window results, Early morning had the highest on-time rate: 91.9% of 802 flights. Evening was lowest at 56.8% across 790 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning80291.9%3.9%1.5%
Late morning70185.7%8.0%1.6%
Afternoon96764.6%23.1%2.3%
Evening79056.8%29.1%5.2%
Night29659.1%29.1%3.4%

Which weekday was most reliable for BWI to BOS?

Among qualifying BWI-to-BOS weekday results, Saturday had the highest on-time rate: 81.4% of 414 flights. Sunday was lowest at 65.3% across 527 flights.

DayFlightsOn time30+ minCancelled
Monday53768.3%20.5%4.7%
Tuesday51475.9%15.2%1.6%
Wednesday49875.9%17.1%1.2%
Thursday53070.8%19.6%2.8%
Friday53673.9%17.9%1.9%
Saturday41481.4%9.9%1.2%
Sunday52765.3%21.3%5.1%

Which airline was most reliable for BWI to BOS?

Among qualifying BWI-to-BOS airline results, Republic Airways had the highest on-time rate: 78.1% of 1,086 flights. Spirit Airlines was lowest at 64.3% across 98 flights.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines2,37270.7%18.4%2.4%
Republic Airways1,08678.1%15.3%3.1%
Spirit Airlines9864.3%23.5%6.1%

Which month was most reliable for BWI to BOS?

Among qualifying BWI-to-BOS month results, November 2025 had the highest on-time rate: 80.2% of 293 flights. September 2025 was lowest at 59.4% across 288 flights.

MonthFlightsOn time30+ minCancelled
July 202536566.8%23.6%4.9%
August 202531878.0%15.1%1.3%
September 202528859.4%31.2%1.4%
October 202533667.3%25.0%0.9%
November 202529380.2%11.9%5.8%
December 202527471.5%16.8%1.5%
January 202623979.1%9.6%5.4%
February 202623575.7%7.7%8.9%
March 202626671.8%14.3%3.4%
April 202632478.4%15.7%0.3%
May 202631674.1%17.1%0.0%
June 202630273.2%17.5%0.7%

What drove BWI to BOS delay minutes?

National airspace was the largest recorded BWI-to-BOS delay category, accounting for 39.3% of 59,002 BTS-attributed delay minutes during July 2025–June 2026.

Airline29.4%
Late aircraft28.9%
National airspace39.3%
Weather2.4%
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.