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Ranking & search details
3 nonstop, 37 with 1 connection, 6 with 2 · ranked by overall best · 45 hidden by your Most reliable time setting (they leave at other times of day)
Most reliable time: overnight departures (10 PM–5 AM), the window with the best on-time odds for this trip. Turn off “Most reliable” under Departure time in Advanced settings to see every time.
Fares seen on this date: nonstop from 562 · any route from 312 (recent searches, one way, per person; each card opens the live price)
1 matching trip
Why this is our top pick
- This overnight flight leaves in the most reliable time of day on this route: its best departures have an 86% reliability rating vs 50% for midday departures.
- United trips we compared arrive on time 84% of the time on average, 5 points more often than Delta and Alaska (79%).
Aircraft and legroom reflect the planes each flight has flown recently. Airlines can swap planes and seat maps change, so check the airline’s seat map when you book.
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
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.
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%).
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