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

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

74.2% of 919 official scheduled RDU-to-SEA flights arrived on time; 12.4% arrived at least 30 minutes late and 1.5% 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 SIGNALGenerally reliable
74.2%arrived on time
12.4%30+ min late
1.5%cancelled
919scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.7%all scheduled flights
120+ minutes late1.6%all scheduled flights
Diverted0.7%did not reach as scheduled
Average arrival+3.8 mincompleted flights

Which departure time was most reliable for RDU to SEA?

Among qualifying RDU-to-SEA departure window results, Early morning had the highest on-time rate: 78.6% of 588 flights. Evening was lowest at 66.5% across 331 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning58878.6%10.5%1.4%
Evening33166.5%15.7%1.8%

Which weekday was most reliable for RDU to SEA?

Among qualifying RDU-to-SEA weekday results, Saturday had the highest on-time rate: 79.5% of 127 flights. Monday was lowest at 64.2% across 137 flights.

DayFlightsOn time30+ minCancelled
Monday13764.2%17.5%2.2%
Tuesday12876.6%12.5%0.0%
Wednesday12273.8%14.8%0.0%
Thursday13175.6%9.9%0.8%
Friday13775.2%13.9%0.7%
Saturday12779.5%7.9%1.6%
Sunday13775.2%10.2%5.1%

Which airline was most reliable for RDU to SEA?

Among qualifying RDU-to-SEA airline results, Delta Air Lines had the highest on-time rate: 81.0% of 364 flights. Alaska Airlines was lowest at 69.7% across 555 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines55569.7%14.6%1.6%
Delta Air Lines36481.0%9.1%1.4%

Which month was most reliable for RDU to SEA?

Among qualifying RDU-to-SEA month results, September 2025 had the highest on-time rate: 90.9% of 77 flights. December 2025 was lowest at 46.6% across 73 flights.

MonthFlightsOn time30+ minCancelled
July 20259371.0%22.6%0.0%
August 20258873.9%9.1%3.4%
September 20257790.9%2.6%0.0%
October 20256581.5%9.2%1.5%
November 20256683.3%10.6%1.5%
December 20257346.6%24.7%1.4%
January 20266771.6%14.9%4.5%
February 20265671.4%10.7%5.4%
March 20267065.7%20.0%1.4%
April 20268187.7%6.2%0.0%
May 20269371.0%8.6%1.1%
June 20269075.6%10.0%0.0%

What drove RDU to SEA delay minutes?

National airspace was the largest recorded RDU-to-SEA delay category, accounting for 34.3% of 10,285 BTS-attributed delay minutes during July 2025–June 2026.

Airline34.2%
Late aircraft27.3%
National airspace34.3%
Weather3.1%
Security1.2%
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.