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

Atlanta, GA (ATL) to Seattle, WA (SEA) flight delay odds

Historically, 77.1% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 3,277 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
77.1%arrived on time
12.1%30+ min late
0.6%cancelled
3,277scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.2%all scheduled flights
120+ minutes late2.0%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+4.4 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 morning72681.8%9.0%1.1%
Late morning84680.7%9.8%0.4%
Afternoon78978.7%11.4%0.1%
Evening65164.2%20.0%1.1%
Night26578.9%10.6%0.8%

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
Monday48173.8%12.5%0.8%
Tuesday46377.5%10.8%0.4%
Wednesday44578.0%12.6%0.2%
Thursday47679.0%12.0%0.6%
Friday47774.6%13.0%0.4%
Saturday45281.0%10.6%1.1%
Sunday48375.8%13.0%0.8%

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
Delta Air Lines2,37178.5%11.3%0.5%
Alaska Airlines90673.3%14.2%1.1%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202534776.7%13.0%0.9%
August 202531576.2%15.9%0.3%
September 202528389.0%5.7%0.0%
October 202529580.7%11.5%1.0%
November 202525784.0%8.6%0.8%
December 202526960.2%20.1%1.1%
January 202621472.4%13.6%1.4%
February 202619374.6%9.3%0.5%
March 202623267.7%18.1%1.3%
April 202625287.7%6.7%0.4%
May 202629676.7%11.8%0.0%
June 202632476.2%10.5%0.3%

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.

Airline49.9%
Late aircraft18.7%
National airspace26.8%
Weather4.5%
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.