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

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

Salt Lake City (Salt Lake City International Airport) to Dulles (Washington Dulles International Airport). 714 nonstop flights in Jun 2025 to May 2026, 86% arrived within 15 minutes and 1.1% were cancelled. The most reliable flight number was United 1322 at 10:10 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)

SLC → IAD

Salt Lake City to Dulles: 714 nonstop flights a year

On time (12 months)

86%

Cancelled

1.1%

avg delay 10 min

Best time to leave

9 AM to noon

91% on time vs 80% noon to 3 PM

Most reliable airline

United

87% chance on time

Check SLC to IAD fares

Lowest nonstop fare seen in the next two months: $562 (United 1322 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 · United 1322

    10:10 AM → 4:23 PM4h 13m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    94%

    chance on time

    On time (history)
    97%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 97% of the time (73 flights, Jun 2025 to May 2026).
    • Never cancelled in 74 scheduled flights.
    • Leaves in this route's most on-time window (9 AM to noon: 91% on time; Noon to 3 PM: 80%).
    • Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.

    Moderate track record · 73 flights

    Find United 1322 fares Opens this date on Aviasales

  2. #2 · United 726

    11:59 PM → 6:13 AM4h 14m nonstop

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

    87%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).

    Limited track record · 11 flights

    Find United 726 fares Opens this date on Aviasales

  3. #3 · Delta 847

    5:50 PM → 11:40 PM3h 54m nonstop

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

    82%

    chance on time

    On time (history)
    84%
    Cancelled
    1.6%
    Avg arrival delay
    11 min
    • Arrived on time 84% of the time (358 flights, Jun 2025 to May 2026).

    Strong track record · 358 flights

    Find Delta 847 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines87%

    349 flights · 88% on time as flown · 0.7% cancel

  • Delta Air Lines83%

    365 flights · 84% on time as flown · 1.5% cancel

On time by departure time

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

  • 9 AM to noon91%

    217 flights · avg delay 6 min

  • Noon to 3 PM80%

    54 flights · avg delay 16 min

  • 3 to 6 PM83%

    342 flights · avg delay 11 min

  • After 9 PM83%

    54 flights · avg delay 13 min

Best day: Saturday (88%). Worst: Thursday (82%).

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
86
F
85
M
82
A
89
M
83
J
76
J
76
A
86
S
94
O
90
N
94
D
83

What delays this route

  • Airline (crew, maintenance, boarding)55%
  • Air traffic control and airport volume22%
  • Late-arriving aircraft19%
  • Severe weather4%

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 SLC to IAD…

SLC to IAD questions

What time of day is best to fly SLC to IAD?
9 AM to noon: 91% of flights arrived on time, against 80% for departures noon to 3 PM.
Which airline is most on time from SLC to IAD?
United, with a season-adjusted 87% chance of operating and arriving on time over 349 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 SLC to IAD?
June (76% on time); the best was September (94%), 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 SLC

Most on-time flights from SLC on every route →

Live status: FAA delays and ground stops