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

Grand Rapids, MI (GRR) to Philadelphia, PA (PHL) flight delay odds

Historically, 85.2% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 277 flights.

HISTORICAL ROUTE SIGNALLower disruption
85.2%arrived on time
9.7%30+ min late
1.4%cancelled
277scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.5%all scheduled flights
120+ minutes late4.3%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+0.5 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 morning11788.0%6.8%1.7%
Afternoon15983.0%11.9%1.3%

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
Monday4586.7%6.7%2.2%
Tuesday3683.3%11.1%2.8%
Wednesday3485.3%11.8%0.0%
Thursday4276.2%19.0%2.4%
Friday4789.4%8.5%0.0%
Saturday3987.2%2.6%2.6%
Sunday3488.2%8.8%0.0%

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
PSA Airlines22885.5%9.6%1.8%
Republic Airways3786.5%8.1%0.0%
Allegiant Air1275.0%16.7%0.0%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 2025560.0%40.0%0.0%
August 20252588.0%4.0%0.0%
September 20255787.7%10.5%0.0%
October 20255194.1%5.9%0.0%
November 20253100.0%0.0%0.0%
December 20251100.0%0.0%0.0%
April 20262487.5%12.5%0.0%
May 20264372.1%11.6%2.3%
June 20266883.8%10.3%4.4%

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.

Airline50.5%
Late aircraft33.1%
National airspace8.2%
Weather8.2%
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.