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

Seattle, WA (SEA) to Raleigh/Durham, NC (RDU) flight delay odds

Historically, 77.7% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 919 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
77.7%arrived on time
11.0%30+ min late
1.1%cancelled
919scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late3.9%all scheduled flights
120+ minutes late1.1%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+1.3 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 morning12677.8%11.1%0.0%
Late morning23884.9%6.3%0.8%
Afternoon34975.9%11.7%1.1%
Night20672.3%15.0%1.9%

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
Monday13672.1%14.0%0.7%
Tuesday12882.0%10.2%0.0%
Wednesday12284.4%9.8%0.0%
Thursday13276.5%10.6%0.8%
Friday13375.9%13.5%0.8%
Saturday13177.9%4.6%3.1%
Sunday13775.9%13.9%2.2%

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
Alaska Airlines55579.1%10.6%0.9%
Delta Air Lines36475.5%11.5%1.4%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 20259361.3%20.4%1.1%
August 20258864.8%15.9%2.3%
September 20257775.3%9.1%0.0%
October 20256487.5%6.2%0.0%
November 20256777.6%16.4%0.0%
December 20257378.1%9.6%1.4%
January 20266683.3%6.1%6.1%
February 20265680.4%8.9%1.8%
March 20267181.7%14.1%1.4%
April 20268181.5%6.2%0.0%
May 20269381.7%9.7%0.0%
June 20269085.6%6.7%0.0%

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.

Airline44.4%
Late aircraft27.3%
National airspace26.9%
Weather1.4%
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.