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

Nashville, TN (BNA) to Seattle, WA (SEA) flight delay odds

Historically, 71.7% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,479 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
71.7%arrived on time
15.5%30+ min late
1.1%cancelled
1,479scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.3%all scheduled flights
120+ minutes late2.2%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+8.0 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 morning73078.5%11.1%1.5%
Late morning14584.1%6.9%0.7%
Afternoon23066.5%15.2%0.9%
Evening37457.0%27.5%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
Monday21869.7%16.5%1.4%
Tuesday21273.6%10.4%0.5%
Wednesday20380.3%10.3%1.0%
Thursday20967.5%19.1%0.5%
Friday21665.7%21.8%2.3%
Saturday20976.1%13.9%0.0%
Sunday21269.8%16.0%2.4%

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 Airlines84369.2%17.0%1.4%
Delta Air Lines51182.8%8.4%0.8%
Southwest Airlines12544.0%34.4%0.8%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202518871.3%16.5%0.5%
August 202517663.1%25.6%1.1%
September 202513574.8%16.3%0.0%
October 202511775.2%8.5%1.7%
November 20258876.1%13.6%0.0%
December 20259054.4%20.0%0.0%
January 20268163.0%18.5%7.4%
February 20267684.2%7.9%0.0%
March 20269170.3%17.6%1.1%
April 202611883.9%7.6%0.0%
May 202614278.9%9.9%0.7%
June 202617768.4%17.5%2.3%

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.

Airline36.6%
Late aircraft32.3%
National airspace26.8%
Weather4.0%
Security0.3%
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.