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

Denver, CO (DEN) to Boston, MA (BOS) flight delay odds

70.5% of 3,903 official scheduled DEN-to-BOS flights arrived on time; 20.2% 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 SIGNALGenerally reliable
70.5%arrived on time
20.2%30+ min late
1.2%cancelled
3,903scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late11.5%all scheduled flights
120+ minutes late4.2%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+12.0 mincompleted flights

Which departure time was most reliable for DEN to BOS?

Among qualifying DEN-to-BOS departure window results, Early morning had the highest on-time rate: 87.5% of 439 flights. Evening was lowest at 60.3% across 701 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning43987.5%6.6%0.9%
Late morning1,12972.4%17.7%1.2%
Afternoon1,09563.6%26.8%1.5%
Evening70160.3%26.8%0.9%
Night53980.0%14.1%1.3%

Which weekday was most reliable for DEN to BOS?

Among qualifying DEN-to-BOS weekday results, Saturday had the highest on-time rate: 82.9% of 468 flights. Monday was lowest at 65.9% across 583 flights.

DayFlightsOn time30+ minCancelled
Monday58365.9%21.8%2.6%
Tuesday54269.4%20.5%0.9%
Wednesday55472.0%21.3%0.0%
Thursday58267.9%24.2%0.7%
Friday58771.2%21.3%0.7%
Saturday46882.9%9.8%0.4%
Sunday58766.6%20.3%2.7%

Which airline was most reliable for DEN to BOS?

Among qualifying DEN-to-BOS airline results, United Airlines had the highest on-time rate: 76.3% of 1,911 flights. Southwest Airlines was lowest at 59.0% across 910 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines1,91176.3%16.1%0.8%
Southwest Airlines91059.0%28.2%1.1%
JetBlue Airways68267.2%23.5%2.1%
Delta Air Lines40074.5%15.8%1.5%

Which month was most reliable for DEN to BOS?

Among qualifying DEN-to-BOS month results, December 2025 had the highest on-time rate: 85.1% of 303 flights. September 2025 was lowest at 51.1% across 333 flights.

MonthFlightsOn time30+ minCancelled
July 202542765.3%26.5%1.2%
August 202539772.5%18.4%0.5%
September 202533351.1%40.2%0.6%
October 202534359.5%28.9%0.0%
November 202529279.8%12.3%0.0%
December 202530385.1%7.6%0.7%
January 202626080.8%9.2%4.6%
February 202626770.4%16.1%7.5%
March 202630074.0%18.3%0.3%
April 202628473.2%18.3%0.0%
May 202632375.5%16.1%0.3%
June 202637466.0%22.2%0.3%

What drove DEN to BOS delay minutes?

National airspace was the largest recorded DEN-to-BOS delay category, accounting for 43.0% of 76,533 BTS-attributed delay minutes during July 2025–June 2026.

Airline19.1%
Late aircraft37.1%
National airspace43.0%
Weather0.9%
Security0.0%
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.