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

New York, NY (LGA) to Portland, ME (PWM) flight delay odds

Historically, 73.8% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,137 flights.

HISTORICAL ROUTE SIGNALHigher disruption
73.8%arrived on time
15.1%30+ min late
4.7%cancelled
1,137scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late8.8%all scheduled flights
120+ minutes late2.2%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+4.0 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 morning8390.4%4.8%1.2%
Late morning36280.7%7.7%5.2%
Afternoon33072.1%18.2%3.0%
Evening13466.4%20.9%6.0%
Night22863.6%22.8%7.0%

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
Monday16972.8%16.6%7.1%
Tuesday17474.7%16.7%4.0%
Wednesday16773.1%15.6%3.6%
Thursday16573.9%13.9%6.1%
Friday16674.7%15.7%3.6%
Saturday12379.7%11.4%1.6%
Sunday17369.4%15.0%6.4%

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
Republic Airways1,10773.4%15.4%4.9%
American Airlines2788.9%3.7%0.0%
Delta Air Lines366.7%33.3%0.0%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 20258158.0%23.5%12.3%
August 20258684.9%7.0%2.3%
September 20258686.0%9.3%1.2%
October 202514262.7%23.2%2.8%
November 20258169.1%19.8%6.2%
December 20257667.1%17.1%5.3%
January 20266177.0%9.8%8.2%
February 20265479.6%9.3%9.3%
March 20268360.2%15.7%15.7%
April 202613475.4%20.1%0.7%
May 202613082.3%7.7%0.8%
June 202612382.1%13.0%2.4%

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.

Airline26.2%
Late aircraft50.7%
National airspace21.4%
Weather1.7%
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.