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

Chicago, IL (MDW) to Boston, MA (BOS) flight delay odds

66.5% of 1,381 official scheduled MDW-to-BOS flights arrived on time; 21.3% arrived at least 30 minutes late and 1.2% 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
66.5%arrived on time
21.3%30+ min late
1.2%cancelled
1,381scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late10.6%all scheduled flights
120+ minutes late3.6%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+15.5 mincompleted flights

Which departure time was most reliable for MDW to BOS?

Among qualifying MDW-to-BOS departure window results, Early morning had the highest on-time rate: 89.9% of 287 flights. Afternoon was lowest at 51.3% across 439 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning28789.9%4.9%0.0%
Late morning24980.3%10.0%2.4%
Afternoon43951.3%34.4%0.5%
Evening38357.2%25.8%2.3%

Which weekday was most reliable for MDW to BOS?

Among qualifying MDW-to-BOS weekday results, Saturday had the highest on-time rate: 76.6% of 184 flights. Sunday was lowest at 59.6% across 208 flights.

DayFlightsOn time30+ minCancelled
Monday20760.4%28.0%1.9%
Tuesday18771.7%17.1%0.0%
Wednesday17867.4%20.2%0.6%
Thursday20662.6%23.8%1.0%
Friday21169.2%23.7%0.9%
Saturday18476.6%9.2%2.2%
Sunday20859.6%25.0%1.9%

Which airline was most reliable for MDW to BOS?

Only Southwest Airlines met the MDW-to-BOS airline threshold: 66.5% of 1,381 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines1,38166.5%21.3%1.2%

Which month was most reliable for MDW to BOS?

Among qualifying MDW-to-BOS month results, January 2026 had the highest on-time rate: 76.8% of 69 flights. March 2026 was lowest at 54.0% across 113 flights.

MonthFlightsOn time30+ minCancelled
July 202517266.3%22.1%2.3%
August 202513473.9%17.2%0.0%
September 202512855.5%35.2%0.0%
October 202513961.9%25.9%0.7%
November 20258870.5%14.8%4.5%
December 20259073.3%17.8%0.0%
January 20266976.8%10.1%2.9%
February 20266376.2%11.1%4.8%
March 202611354.0%26.5%0.9%
April 202611972.3%21.8%0.0%
May 202612371.5%17.1%0.0%
June 202614359.4%22.4%1.4%

What drove MDW to BOS delay minutes?

National airspace was the largest recorded MDW-to-BOS delay category, accounting for 36.0% of 27,407 BTS-attributed delay minutes during July 2025–June 2026.

Airline29.4%
Late aircraft31.4%
National airspace36.0%
Weather2.0%
Security1.1%
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.