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

Philadelphia, PA (PHL) to Boston, MA (BOS) flight delay odds

Historically, 73.0% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 4,956 flights.

HISTORICAL ROUTE SIGNALVariable
73.0%arrived on time
18.5%30+ min late
2.9%cancelled
4,956scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late11.7%all scheduled flights
120+ minutes late4.3%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+10.4 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 morning1,25486.7%7.4%2.0%
Late morning99985.0%8.2%2.1%
Afternoon1,25565.3%25.7%3.1%
Evening1,14157.8%30.8%4.0%
Night30766.4%22.1%4.6%

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
Monday75167.4%20.5%5.6%
Tuesday73874.7%16.8%3.0%
Wednesday70277.9%15.5%2.1%
Thursday74971.7%21.8%1.7%
Friday73774.2%19.0%0.9%
Saturday54281.2%12.2%1.8%
Sunday73766.5%21.7%4.9%

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
American Airlines2,24669.3%21.3%2.9%
Republic Airways1,76178.3%14.1%3.2%
JetBlue Airways89271.0%20.6%2.6%
Frontier Airlines5786.0%8.8%1.8%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202542062.9%25.2%6.7%
August 202540675.9%15.5%1.5%
September 202542759.3%29.0%2.3%
October 202546263.6%28.4%1.5%
November 202540779.4%13.5%2.7%
December 202536574.5%16.7%1.6%
January 202636573.2%13.4%7.9%
February 202636176.7%11.1%8.0%
March 202642976.2%17.2%0.9%
April 202641980.4%16.0%0.0%
May 202643780.5%13.0%1.1%
June 202645875.1%19.4%2.2%

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.

Airline22.7%
Late aircraft41.1%
National airspace31.1%
Weather5.1%
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.