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

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

82.8% of 4,107 official scheduled SEA-to-SLC flights arrived on time; 8.8% arrived at least 30 minutes late and 0.9% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

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

Which departure time was most reliable for SEA to SLC?

Among qualifying SEA-to-SLC departure window results, Early morning had the highest on-time rate: 92.7% of 851 flights. Afternoon was lowest at 79.5% across 995 flights.

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%

Which weekday was most reliable for SEA to SLC?

Among qualifying SEA-to-SLC weekday results, Wednesday had the highest on-time rate: 85.4% of 541 flights. Thursday was lowest at 79.9% across 608 flights.

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%

Which airline was most reliable for SEA to SLC?

Among qualifying SEA-to-SLC airline results, Delta Air Lines had the highest on-time rate: 86.4% of 2,219 flights. Frontier Airlines was lowest at 70.4% across 98 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%

Which month was most reliable for SEA to SLC?

Among qualifying SEA-to-SLC month results, April 2026 had the highest on-time rate: 92.4% of 314 flights. July 2025 was lowest at 75.6% across 394 flights.

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 SEA to SLC delay minutes?

Airline was the largest recorded SEA-to-SLC delay category, accounting for 48.0% of 33,289 BTS-attributed delay minutes during July 2025–June 2026.

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.