Skip to content

All Products

Aviation Intelligence

Alerts & Airspace

Free Pilot Tools & Widgets

RC Aviation

Games & Learning

Weather Research & More

Pilot Resources

My Airports

Your shortcuts, saved on this device. Search to add an airport.

No airports saved yet. Add the fields you visit most.

Ask ATIS

Route on-time record

IAD to SLC: most on-time flights and the best time to fly

Dulles (Washington Dulles International Airport) to Salt Lake City (Salt Lake City International Airport). 715 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 1.0% were cancelled. The most reliable flight number was Delta 432 at 7:20 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

Find me the most reliable flights fromtoonreturning(optional)

IAD → SLC

Dulles to Salt Lake City: 715 nonstop flights a year

On time (12 months)

82%

Cancelled

1.0%

avg delay 17 min

Best time to leave

No clear winner

Most reliable airline

Delta

82% chance on time

Check IAD to SLC fares

Lowest nonstop fare seen in the next two months: $364 (United 2410 on 2026-10-28). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Most reliable nonstop flights

Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.

  1. #1 · Delta 432

    7:20 AM → 10:05 AM4h 44m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    82%

    chance on time

    On time (history)
    83%
    Cancelled
    1.6%
    Avg arrival delay
    19 min
    • Arrived on time 83% of the time (358 flights, Jun 2025 to May 2026).
    • Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).

    Strong track record · 358 flights

    Find Delta 432 fares Opens this date on Aviasales

  2. #2 · United 2410

    5:50 PM → 8:57 PM5h 07m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    80%

    chance on time

    On time (history)
    81%
    Cancelled
    0.3%
    Avg arrival delay
    16 min
    • Arrived on time 81% of the time (293 flights, Jun 2025 to May 2026).
    • Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.

    Strong track record · 293 flights

    Find United 2410 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Delta Air Lines82%

    365 flights · 83% on time as flown · 1.5% cancel

  • United Airlines81%

    350 flights · 82% on time as flown · 0.5% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM84%

    418 flights · avg delay 18 min

  • 3 to 6 PM81%

    297 flights · avg delay 15 min

On time by month

All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.

J
79
F
77
M
88
A
87
M
92
J
78
J
82
A
86
S
92
O
91
N
82
D
82

What delays this route

  • Airline (crew, maintenance, boarding)62%
  • Late-arriving aircraft22%
  • Air traffic control and airport volume12%
  • Severe weather3%

Share of delay minutes by the cause airlines report to the US DOT.

Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure

Finding the most reliable connections from IAD to SLC…

IAD to SLC questions

Which airline is most on time from IAD to SLC?
Delta, with a season-adjusted 82% chance of operating and arriving on time over 365 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
What is the worst month for delays on IAD to SLC?
February (77% on time); the best was September (92%), averaged over Jun 2023 to May 2026.
Is this a prediction for my flight?
No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.

More routes from IAD

Most on-time flights from IAD on every route →

Live status: FAA delays and ground stops