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

Salt Lake City, UT (SLC) to Washington, DC (IAD) flight delay odds

86.3% of 713 official scheduled SLC-to-IAD flights arrived on time; 7.9% arrived at least 30 minutes late and 1.3% 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
86.3%arrived on time
7.9%30+ min late
1.3%cancelled
713scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.5%all scheduled flights
120+ minutes late1.4%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival-1.1 mincompleted flights

Which departure time was most reliable for SLC to IAD?

Among qualifying SLC-to-IAD departure window results, Late morning had the highest on-time rate: 89.8% of 216 flights. Afternoon was lowest at 82.7% across 52 flights.

Departure windowFlightsOn time30+ minCancelled
Late morning21689.8%3.2%0.9%
Afternoon5282.7%15.4%0.0%
Evening36184.5%9.4%1.7%
Night8486.9%8.3%1.2%

Which weekday was most reliable for SLC to IAD?

Among qualifying SLC-to-IAD weekday results, Tuesday had the highest on-time rate: 91.3% of 103 flights. Sunday was lowest at 78.4% across 102 flights.

DayFlightsOn time30+ minCancelled
Monday10288.2%5.9%2.9%
Tuesday10391.3%4.9%1.0%
Wednesday10185.1%6.9%1.0%
Thursday10186.1%7.9%0.0%
Friday10285.3%12.7%0.0%
Saturday10289.2%6.9%0.0%
Sunday10278.4%9.8%3.9%

Which airline was most reliable for SLC to IAD?

Among qualifying SLC-to-IAD airline results, United Airlines had the highest on-time rate: 88.0% of 349 flights. Delta Air Lines was lowest at 84.6% across 364 flights.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines36484.6%9.3%1.6%
United Airlines34988.0%6.3%0.9%

Which month was most reliable for SLC to IAD?

Among qualifying SLC-to-IAD month results, August 2025 had the highest on-time rate: 95.2% of 62 flights. July 2025 was lowest at 72.6% across 62 flights.

MonthFlightsOn time30+ minCancelled
July 20256272.6%19.4%0.0%
August 20256295.2%4.8%0.0%
September 20256090.0%6.7%0.0%
October 20256288.7%3.2%0.0%
November 20255991.5%5.1%0.0%
December 20254684.8%10.9%2.2%
January 20266275.8%8.1%6.5%
February 20265683.9%7.1%3.6%
March 20266282.3%9.7%1.6%
April 20266091.7%6.7%0.0%
May 20266287.1%8.1%0.0%
June 20266091.7%5.0%1.7%

What drove SLC to IAD delay minutes?

Airline was the largest recorded SLC-to-IAD delay category, accounting for 56.0% of 5,836 BTS-attributed delay minutes during July 2025–June 2026.

Airline56.0%
Late aircraft18.7%
National airspace21.0%
Weather4.2%
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.