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ATIS Alerts Smart Flight Search

Find the flight least likely to be delayed

Beta

We rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.

IAD → PIT

Dulles to Pittsburgh: 1,282 nonstop flights a year

On time (12 months)

84%

Cancelled

1.6%

avg delay 14 min

Best time to leave

Before 9 AM

93% on time vs 76% 3 to 6 PM

Most reliable airline

United

85% chance on time

Check IAD to PIT fares

Lowest nonstop fare seen in the next two months: $258 (United 3540 on 2026-10-23). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Best trips

8 nonstop. Best overall weighs the chance you arrive on time as booked, connection odds, travel time and separate tickets.

  1. Best overall#1 · Nonstop · 1h 01m

    8:33 AM → 9:34 AM

    90%

    arrive on time

    8:33 AM IAD → 9:34 AM PIT1h 01m

    United 726

    Boeing 737-700 or Airbus A319 · 3–28 yrs old
    91% on time · 0.9% cancel
    Find United 726 fares Opens this date on Aviasales

  2. #2 · Nonstop · 1h 10m

    8:25 AM → 9:35 AM

    88%

    arrive on time

    8:25 AM IAD → 9:35 AM PIT1h 10m

    Republic 3413 · sold as American Eagle, Delta Connection or United Express

    Embraer E170 or E175 · 9–21 yrs old
    90% on time · 2.4% cancel
    Find 8:25 AM flight fares Opens this date on Aviasales

  3. #3 · Nonstop · 1h 07m

    12:56 PM → 2:03 PM

    88%

    arrive on time

    12:56 PM IAD → 2:03 PM PIT1h 07m

    United 2066

    Boeing 737-700 · 17–28 yrs old
    88% on time · 0.9% cancel
    Find United 2066 fares Opens this date on Aviasales

  4. #4 · Nonstop · 1h 04m

    12:50 PM → 1:54 PM

    86%

    arrive on time

    12:50 PM IAD → 1:54 PM PIT1h 04m

    United 1858 · also flew as 274

    Boeing 737-700 · 23–28 yrs old
    87% on time · 0.8% cancel
    Find United 1858 fares Opens this date on Aviasales

  5. #5 · Nonstop · 1h 18m

    5:40 PM → 6:58 PM

    86%

    arrive on time

    5:40 PM IAD → 6:58 PM PIT1h 18m

    Republic 3709 · sold as American Eagle, Delta Connection or United Express · also flew as 3541

    Embraer E175 · 1–11 yrs old
    87% on time · 1.7% cancel
    Find 5:40 PM flight fares Opens this date on Aviasales

  6. #6 · Nonstop · 1h 08m

    10:12 PM → 11:20 PM

    79%

    arrive on time

    10:12 PM IAD → 11:20 PM PIT1h 08m

    Republic 3540 · sold as American Eagle, Delta Connection or United Express

    Embraer E175 · 2–11 yrs old
    80% on time · 1.9% cancel
    Find 10:12 PM flight fares Opens this date on Aviasales

  7. #7 · Nonstop · 1h 06m

    5:55 PM → 7:01 PM

    78%

    arrive on time

    5:55 PM IAD → 7:01 PM PIT1h 06m

    United 765

    Airbus A319 · 19–28 yrs old
    78% on time · 0.9% cancel
    Find United 765 fares Opens this date on Aviasales

  8. #8 · Nonstop · 1h 10m

    5:30 PM → 6:40 PM

    77%

    arrive on time

    5:30 PM IAD → 6:40 PM PIT1h 10m

    Republic 3579 · sold as American Eagle, Delta Connection or United Express

    Embraer E175 · 1–10 yrs old
    78% on time · 1.9% cancel
    Find 5:30 PM flight fares Opens this date on Aviasales

Aircraft and ages come from the planes each flight number actually flew in the last 3 months of data (FAA registry build years); airlines can swap planes.

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines85%

    473 flights · 87% on time as flown · 1.0% cancel

  • Republic Airways (sold as American Eagle, Delta Connection or United Express)81%

    809 flights · 82% on time as flown · 2.0% cancel

On time by departure time

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

  • Before 9 AM93%

    261 flights · avg delay 5 min

  • Noon to 3 PM89%

    275 flights · avg delay 13 min

  • 3 to 6 PM76%

    382 flights · avg delay 18 min

  • After 9 PM81%

    364 flights · avg delay 16 min

Best day: Tuesday (87%). Worst: Sunday (81%).

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