Route on-time record
PIT to IAD: most on-time flights and the best time to fly
Pittsburgh (Pittsburgh International Airport) to Dulles (Washington Dulles International Airport). 1,279 nonstop flights in Jun 2025 to May 2026, 88% arrived within 15 minutes and 1.3% were cancelled. The most reliable flight number was Republic 3679 at 6:10 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
PIT → IAD
Pittsburgh to Dulles: 1,279 nonstop flights a year
On time (12 months)
88%
Cancelled
1.3%
avg delay 8 min
Best time to leave
Before 9 AM
98% on time vs 69% 3 to 6 PM
Most reliable airline
United
88% chance on time
Lowest nonstop fare seen in the next two months: $214 (United 3679 on 2026-11-06). 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 · Republic 3679 · sold as American Eagle, Delta Connection or United Express
6:10 AM → 7:19 AM1h 09m nonstop
Local times, typical schedule. Last flown 2026-05-31.
97%
chance on time
- On time (history)
- 98%
- Cancelled
- 0.8%
- Avg arrival delay
- 2 min
- Arrived on time 98% of the time (356 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 98% on time; 3 to 6 PM: 69%).
Strong track record · 356 flights
Find 6:10 AM flight fares Opens this date on Aviasales#2 · United 1689
10:30 AM → 11:36 AM1h 06m nonstop
Local times, typical schedule. Last flown 2026-05-20.
94%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 96% of the time (53 flights, Jun 2025 to May 2026).
- Never cancelled in 53 scheduled flights.
- Short track record (53 flights), so its score leans on the airline's record at this hour.
Limited track record · 53 flights
Find United 1689 fares Opens this date on Aviasales#3 · Republic 3715 · sold as American Eagle, Delta Connection or United Express
10:30 AM → 11:45 AM1h 15m nonstop
Local times, typical schedule. Last flown 2026-03-27.
90%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 min
- Arrived on time 90% of the time (20 flights, Jun 2025 to May 2026).
- Short track record (20 flights), so its score leans on the airline's record at this hour.
Limited track record · 20 flights
Find 10:30 AM flight fares Opens this date on Aviasales#4 · Republic 3678 · sold as American Eagle, Delta Connection or United Express
7:52 PM → 9:05 PM1h 13m nonstop
Local times, typical schedule. Last flown 2026-05-19.
87%
chance on time
- On time (history)
- 94%
- Cancelled
- 5.6%
- Avg arrival delay
- 10 min
- Arrived on time 94% of the time (17 flights, Jun 2025 to May 2026).
- Short track record (17 flights), so its score leans on the airline's record at this hour.
Limited track record · 17 flights
Find 7:52 PM flight fares Opens this date on Aviasales#5 · Republic 3449 · sold as American Eagle, Delta Connection or United Express
7:59 PM → 9:18 PM1h 19m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Republic 3552; its record covers all of them.
84%
chance on time
- On time (history)
- 83%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 83% of the time (23 flights, Jun 2025 to May 2026).
- 62% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find 7:59 PM flight fares Opens this date on Aviasales#6 · United 2000
7:57 PM → 9:04 PM1h 07m nonstop
Local times, typical schedule. Last flown 2026-03-27.
83%
chance on time
- On time (history)
- 77%
- Cancelled
- 0.0%
- Avg arrival delay
- 24 min
- Arrived on time 77% of the time (31 flights, Jun 2025 to May 2026).
- Never cancelled in 31 scheduled flights.
- 83% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (31 flights), so its score leans on the airline's record at this hour.
Limited track record · 31 flights
Find United 2000 fares Opens this date on Aviasales#7 · United 2081
3:00 PM → 4:06 PM1h 06m nonstop
Local times, typical schedule. Last flown 2026-04-29. Same departure also flew as United 567; its record covers all of them.
78%
chance on time
- On time (history)
- 80%
- Cancelled
- 0.0%
- Avg arrival delay
- 20 min
- Arrived on time 80% of the time (49 flights, Jun 2025 to May 2026).
- Never cancelled in 49 scheduled flights.
- Leaves in this route's least on-time window (3 to 6 PM: 69% on time; Before 9 AM: 98%).
- Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Limited track record · 49 flights
Find United 2081 fares Opens this date on Aviasales#8 · United 2607
3:06 PM → 4:12 PM1h 06m nonstop
Local times, typical schedule. Last flown 2026-05-31.
76%
chance on time
- On time (history)
- 78%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 min
- Arrived on time 78% of the time (9 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 69% on time; Before 9 AM: 98%).
- Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
- Short track record (9 flights), so its score leans on the airline's record at this hour.
Limited track record · 9 flights
Find United 2607 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines88%
473 flights · 89% on time as flown · 1.0% cancel
- Republic Airways (sold as American Eagle, Delta Connection or United Express)87%
806 flights · 88% on time as flown · 1.6% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM98%
359 flights · avg delay 2 min
- 9 AM to noon93%
263 flights · avg delay 5 min
- Noon to 3 PM82%
184 flights · avg delay 10 min
- 3 to 6 PM69%
147 flights · avg delay 19 min
- 6 to 9 PM86%
326 flights · avg delay 10 min
Best day: Saturday (93%). Worst: Sunday (87%).
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.
What delays this route
- Late-arriving aircraft44%
- Air traffic control and airport volume39%
- Airline (crew, maintenance, boarding)13%
- 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
PIT to IAD questions
- What time of day is best to fly PIT to IAD?
- Before 9 AM: 98% of flights arrived on time, against 69% 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 PIT to IAD?
- United, with a season-adjusted 88% 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 PIT to IAD?
- July (85% on time); the best was August (93%), 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 PIT
- IAD to PIT (return)
- PIT to ORD 78%
- PIT to LGA 80%
- PIT to ATL 90%
- PIT to MCO 79%
- PIT to BOS 79%
- PIT to CLT 84%
- PIT to EWR 87%
- PIT to JFK 87%
- PIT to DEN 81%
- PIT to DFW 79%
- PIT to DCA 69%
- PIT to PHL 75%
Live status: FAA delays and ground stops