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

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

82.9% of 714 official scheduled IAD-to-SLC flights arrived on time; 10.1% arrived at least 30 minutes late and 1.1% 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
82.9%arrived on time
10.1%30+ min late
1.1%cancelled
714scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.9%all scheduled flights
120+ minutes late3.6%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+5.6 mincompleted flights

Which departure time was most reliable for IAD to SLC?

Among qualifying IAD-to-SLC departure window results, Early morning had the highest on-time rate: 83.8% of 413 flights. Evening was lowest at 81.7% across 301 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning41383.8%9.4%1.5%
Evening30181.7%11.0%0.7%

Which weekday was most reliable for IAD to SLC?

Among qualifying IAD-to-SLC weekday results, Tuesday had the highest on-time rate: 85.4% of 103 flights. Sunday was lowest at 77.5% across 102 flights.

DayFlightsOn time30+ minCancelled
Monday10384.5%7.8%2.9%
Tuesday10385.4%10.7%1.0%
Wednesday10185.1%9.9%0.0%
Thursday10179.2%9.9%1.0%
Friday10283.3%12.7%0.0%
Saturday10285.3%8.8%0.0%
Sunday10277.5%10.8%2.9%

Which airline was most reliable for IAD to SLC?

Among qualifying IAD-to-SLC airline results, United Airlines had the highest on-time rate: 83.1% of 350 flights. Delta Air Lines was lowest at 82.7% across 364 flights.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines36482.7%9.6%1.6%
United Airlines35083.1%10.6%0.6%

Which month was most reliable for IAD to SLC?

Among qualifying IAD-to-SLC month results, August 2025 had the highest on-time rate: 93.7% of 63 flights. December 2025 was lowest at 69.6% across 46 flights.

MonthFlightsOn time30+ minCancelled
July 20256287.1%12.9%0.0%
August 20256393.7%3.2%0.0%
September 20256086.7%6.7%0.0%
October 20256288.7%8.1%0.0%
November 20255974.6%11.9%0.0%
December 20254669.6%15.2%2.2%
January 20266275.8%11.3%4.8%
February 20265669.6%14.3%3.6%
March 20266282.3%12.9%1.6%
April 20266090.0%8.3%0.0%
May 20266291.9%3.2%0.0%
June 20266080.0%15.0%1.7%

What drove IAD to SLC delay minutes?

Airline was the largest recorded IAD-to-SLC delay category, accounting for 59.2% of 10,385 BTS-attributed delay minutes during July 2025–June 2026.

Airline59.2%
Late aircraft24.7%
National airspace14.2%
Weather1.9%
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.