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

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

73.0% of 4,956 official scheduled PHL-to-BOS flights arrived on time; 18.5% arrived at least 30 minutes late and 2.9% 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
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

Which departure time was most reliable for PHL to BOS?

Among qualifying PHL-to-BOS departure window results, Early morning had the highest on-time rate: 86.7% of 1,254 flights. Evening was lowest at 57.8% across 1,141 flights.

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%

Which weekday was most reliable for PHL to BOS?

Among qualifying PHL-to-BOS weekday results, Saturday had the highest on-time rate: 81.2% of 542 flights. Sunday was lowest at 66.5% across 737 flights.

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%

Which airline was most reliable for PHL to BOS?

Among qualifying PHL-to-BOS airline results, Frontier Airlines had the highest on-time rate: 86.0% of 57 flights. American Airlines was lowest at 69.3% across 2,246 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%

Which month was most reliable for PHL to BOS?

Among qualifying PHL-to-BOS month results, May 2026 had the highest on-time rate: 80.5% of 437 flights. September 2025 was lowest at 59.3% across 427 flights.

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 PHL to BOS delay minutes?

Late aircraft was the largest recorded PHL-to-BOS delay category, accounting for 41.1% of 94,573 BTS-attributed delay minutes during July 2025–June 2026.

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.