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

Denver, CO (DEN) to Seattle, WA (SEA) flight delay odds

Historically, 73.4% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 6,309 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
73.4%arrived on time
16.0%30+ min late
0.8%cancelled
6,309scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.3%all scheduled flights
120+ minutes late2.5%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+9.0 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 morning1,72785.6%6.8%0.6%
Late morning72978.6%12.5%0.5%
Afternoon1,75873.8%15.1%0.8%
Evening1,61362.0%24.6%0.7%
Night48258.1%28.0%1.7%

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
Monday93573.5%14.7%0.6%
Tuesday86075.8%14.4%0.3%
Wednesday86975.9%13.9%0.3%
Thursday93469.2%18.0%1.0%
Friday93470.4%17.2%1.7%
Saturday83576.2%16.3%0.7%
Sunday94273.2%17.0%0.5%

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
United Airlines1,90379.5%12.1%0.6%
Alaska Airlines1,55873.0%15.6%1.0%
Southwest Airlines1,34161.4%23.6%0.3%
Delta Air Lines86878.5%13.1%0.9%
Frontier Airlines41973.5%16.0%1.9%
SkyWest Airlines22075.5%16.4%0.5%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202567062.4%24.6%1.6%
August 202564564.8%22.2%0.6%
September 202557578.6%13.0%0.0%
October 202555279.2%12.0%0.7%
November 202546482.5%8.6%1.7%
December 202546858.8%24.1%0.9%
January 202643083.0%8.8%0.0%
February 202640183.3%9.7%0.0%
March 202645567.7%18.9%1.8%
April 202646983.8%8.1%0.2%
May 202654676.6%13.2%0.0%
June 202663468.8%20.8%1.3%

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.

Airline34.9%
Late aircraft44.5%
National airspace17.9%
Weather2.5%
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.