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

Seattle, WA (SEA) to Salt Lake City, UT (SLC) flight delay odds

Historically, 82.8% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 4,107 flights.

HISTORICAL ROUTE SIGNALLower disruption
82.8%arrived on time
8.8%30+ min late
0.9%cancelled
4,107scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.2%all scheduled flights
120+ minutes late1.2%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+0.2 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 morning85192.7%3.6%0.8%
Late morning1,13980.6%8.7%0.9%
Afternoon99579.5%10.7%1.6%
Evening1,12180.3%11.2%0.4%

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
Monday64482.3%8.2%0.9%
Tuesday55484.8%7.8%0.2%
Wednesday54185.4%7.2%0.2%
Thursday60879.9%10.9%1.3%
Friday64181.4%9.5%1.9%
Saturday52083.3%10.0%1.2%
Sunday59982.8%8.0%0.7%

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 Lines2,21986.4%7.5%0.5%
Alaska Airlines1,37278.1%9.7%1.7%
SkyWest Airlines41881.3%10.8%0.0%
Frontier Airlines9870.4%17.3%3.1%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202539475.6%11.4%1.0%
August 202540876.7%12.7%1.0%
September 202539888.7%4.8%0.3%
October 202536584.4%9.9%1.4%
November 202529785.2%5.4%2.7%
December 202530576.1%13.8%0.7%
January 202630182.4%10.3%0.0%
February 202629483.0%10.5%0.3%
March 202633481.4%7.5%3.6%
April 202631492.4%3.5%0.0%
May 202633884.9%7.7%0.3%
June 202635983.8%7.8%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.

Airline48.0%
Late aircraft38.9%
National airspace11.3%
Weather1.7%
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.