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Route on-time record

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

Dulles (Washington Dulles International Airport) to Pittsburgh (Pittsburgh International Airport). 1,282 nonstop flights in Jun 2025 to May 2026, 84% arrived within 15 minutes and 1.6% were cancelled. The most reliable flight number was United 726 at 8:33 AM.

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

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.

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 726

    8:33 AM → 9:34 AM1h 01m nonstop

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

    90%

    chance on time

    On time (history)
    92%
    Cancelled
    0.7%
    Avg arrival delay
    6 min
    • Arrived on time 92% of the time (145 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 76%).
    • Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).

    Moderate track record · 145 flights

    Find United 726 fares Opens this date on Aviasales

  2. #2 · Republic 3413 · sold as American Eagle, Delta Connection or United Express

    8:25 AM → 9:35 AM1h 10m nonstop

    Local times, typical schedule. Last flown 2026-03-27.

    88%

    chance on time

    On time (history)
    89%
    Cancelled
    5.0%
    Avg arrival delay
    3 min
    • Arrived on time 89% of the time (19 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 3 to 6 PM: 76%).
    • Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
    • Short track record (19 flights), so its score leans on the airline's record at this hour.

    Limited track record · 19 flights

    Find 8:25 AM flight fares Opens this date on Aviasales

  3. #3 · United 2066

    12:56 PM → 2:03 PM1h 07m nonstop

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

    88%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 88% of the time (25 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).
    • Short track record (25 flights), so its score leans on the airline's record at this hour.

    Limited track record · 25 flights

    Find United 2066 fares Opens this date on Aviasales

  4. #4 · United 1858

    12:50 PM → 1:54 PM1h 04m nonstop

    Local times, typical schedule. Last flown 2026-04-29. Same departure also flew as United 274; its record covers all of them.

    86%

    chance on time

    On time (history)
    87%
    Cancelled
    0.0%
    Avg arrival delay
    19 min
    • Arrived on time 87% of the time (45 flights, Jun 2025 to May 2026).
    • Never cancelled in 45 scheduled flights.
    • Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
    • Short track record (45 flights), so its score leans on the airline's record at this hour.

    Limited track record · 45 flights

    Find United 1858 fares Opens this date on Aviasales

  5. #5 · Republic 3709 · sold as American Eagle, Delta Connection or United Express

    5:40 PM → 6:58 PM1h 18m nonstop

    Local times, typical schedule. Last flown 2026-05-19. Same departure also flew as Republic 3541; its record covers all of them.

    86%

    chance on time

    On time (history)
    89%
    Cancelled
    1.5%
    Avg arrival delay
    12 min
    • Arrived on time 89% of the time (201 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 76% on time; Before 9 AM: 93%).
    • 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 · 201 flights

    Find 5:40 PM flight fares Opens this date on Aviasales

  6. #6 · Republic 3540 · sold as American Eagle, Delta Connection or United Express

    10:12 PM → 11:20 PM1h 08m nonstop

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

    79%

    chance on time

    On time (history)
    80%
    Cancelled
    1.8%
    Avg arrival delay
    17 min
    • Arrived on time 80% of the time (328 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).
    • 53% of its delay minutes came from the plane arriving late from an earlier flight.

    Strong track record · 328 flights

    Find 10:12 PM flight fares Opens this date on Aviasales

  7. #7 · United 765

    5:55 PM → 7:01 PM1h 06m nonstop

    Local times, typical schedule. Last flown 2026-03-27.

    78%

    chance on time

    On time (history)
    71%
    Cancelled
    0.0%
    Avg arrival delay
    30 min
    • Arrived on time 71% of the time (31 flights, Jun 2025 to May 2026).
    • Never cancelled in 31 scheduled flights.
    • Leaves in this route's least on-time window (3 to 6 PM: 76% on time; Before 9 AM: 93%).
    • Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.

    Limited track record · 31 flights

    Find United 765 fares Opens this date on Aviasales

  8. #8 · Republic 3579 · sold as American Eagle, Delta Connection or United Express

    5:30 PM → 6:40 PM1h 10m nonstop

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

    77%

    chance on time

    On time (history)
    82%
    Cancelled
    0.0%
    Avg arrival delay
    14 min
    • Arrived on time 82% of the time (11 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 76% on time; Before 9 AM: 93%).
    • Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find 5:30 PM flight fares Opens this date on Aviasales

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%).

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
84
F
89
M
81
A
92
M
81
J
76
J
79
A
84
S
90
O
92
N
92
D
80

What delays this route

  • Late-arriving aircraft46%
  • Airline (crew, maintenance, boarding)30%
  • Air traffic control and airport volume15%
  • Severe weather9%

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

IAD to PIT questions

What time of day is best to fly IAD to PIT?
Before 9 AM: 93% of flights arrived on time, against 76% for departures 3 to 6 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from IAD to PIT?
United, with a season-adjusted 85% chance of operating and arriving on time over 473 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 PIT?
June (76% on time); the best was October (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

Live status: FAA delays and ground stops