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

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

Historically, 82.0% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 3,276 flights.

HISTORICAL ROUTE SIGNALLower disruption
82.0%arrived on time
10.3%30+ min late
0.5%cancelled
3,276scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.6%all scheduled flights
120+ minutes late2.4%all scheduled flights
Diverted0.4%did not reach as scheduled
Average arrival+3.5 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 morning82688.9%7.4%0.5%
Late morning66178.7%13.2%0.3%
Afternoon83878.6%12.5%0.6%
Evening5276.9%11.5%0.0%
Night89981.6%8.8%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
Monday47279.7%13.8%0.8%
Tuesday45786.4%8.1%0.0%
Wednesday45887.1%6.1%0.4%
Thursday47583.2%8.0%0.2%
Friday47778.6%13.2%1.0%
Saturday45181.2%11.3%0.7%
Sunday48678.4%11.5%0.6%

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 Lines2,37183.0%10.1%0.5%
Alaska Airlines90579.3%10.9%0.7%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202534768.9%17.3%0.3%
August 202531678.8%9.8%0.3%
September 202528490.1%4.9%0.0%
October 202529583.7%9.5%1.0%
November 202525685.9%7.8%0.4%
December 202526978.1%15.2%1.5%
January 202621385.4%10.3%0.9%
February 202619190.6%4.7%0.5%
March 202623178.4%12.1%1.3%
April 202625184.9%6.8%0.8%
May 202629882.6%10.1%0.0%
June 202632583.4%11.7%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.

Airline57.3%
Late aircraft22.5%
National airspace15.2%
Weather5.0%
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.