Route on-time record
IAD to PWM: most on-time flights and the best time to fly
Dulles (Washington Dulles International Airport) to Portland (Portland International Jetport). 821 nonstop flights in Jun 2025 to May 2026, 86% arrived within 15 minutes and 2.2% were cancelled. The most reliable flight number was Republic 3548 at 8:30 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
IAD → PWM
Dulles to Portland: 821 nonstop flights a year
On time (12 months)
86%
Cancelled
2.2%
avg delay 14 min
Best time to leave
Before 9 AM
95% on time vs 74% after 9 PM
Most reliable airline
Republic
84% chance on time
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 3548 · sold as American Eagle, Delta Connection or United Express
8:30 AM → 10:18 AM1h 48m nonstop
Local times, typical schedule. Last flown 2026-05-31.
93%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (27 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 95% on time; After 9 PM: 74%).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
Limited track record · 27 flights
Find 8:30 AM flight fares Opens this date on Aviasales#2 · Republic 3455 · sold as American Eagle, Delta Connection or United Express
1:00 PM → 2:49 PM1h 49m nonstop
Local times, typical schedule. Last flown 2026-05-20.
90%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 1 min
- Arrived on time 100% of the time (18 flights, Jun 2025 to May 2026).
- 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 · 18 flights
Find 1:00 PM flight fares Opens this date on Aviasales#3 · Republic 3535 · sold as American Eagle, Delta Connection or United Express
12:45 PM → 2:34 PM1h 49m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (9 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).
Limited track record · 9 flights
Find 12:45 PM flight fares Opens this date on Aviasales#4 · Republic 3556 · sold as American Eagle, Delta Connection or United Express
5:10 PM → 7:04 PM1h 54m nonstop
Local times, typical schedule. Last flown 2026-05-20.
82%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 24 min
- Arrived on time 90% of the time (21 flights, Jun 2025 to May 2026).
- Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
- 62% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 21 flights
Find 5:10 PM flight fares Opens this date on Aviasales#5 · United 2064
10:10 PM → 11:51 PM1h 41m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
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).
- Leaves in this route's least on-time window (After 9 PM: 74% on time; Before 9 AM: 95%).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
Limited track record · 11 flights
Find United 2064 fares Opens this date on Aviasales#6 · Republic 3619 · sold as American Eagle, Delta Connection or United Express
5:30 PM → 7:27 PM1h 57m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
- On time (history)
- 82%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 min
- Arrived on time 82% of the time (11 flights, Jun 2025 to May 2026).
- 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 · 11 flights
Find 5:30 PM flight fares Opens this date on Aviasales#7 · Republic 3459 · sold as American Eagle, Delta Connection or United Express
10:10 PM → 11:59 PM1h 49m nonstop
Local times, typical schedule. Last flown 2026-05-19.
77%
chance on time
- On time (history)
- 85%
- Cancelled
- 4.8%
- Avg arrival delay
- 33 min
- Arrived on time 85% of the time (20 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (After 9 PM: 74% on time; Before 9 AM: 95%).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
Limited track record · 20 flights
Find 10:10 PM flight fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Republic Airways (sold as American Eagle, Delta Connection or United Express)84%
810 flights · 85% on time as flown · 2.2% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM95%
187 flights · avg delay 3 min
- Noon to 3 PM90%
295 flights · avg delay 7 min
- 3 to 6 PM79%
202 flights · avg delay 18 min
- After 9 PM74%
137 flights · avg delay 39 min
Best day: Tuesday (90%). Worst: Thursday (84%).
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
- Airline (crew, maintenance, boarding)42%
- Late-arriving aircraft38%
- Air traffic control and airport volume13%
- Severe weather7%
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 PWM questions
- What time of day is best to fly IAD to PWM?
- Before 9 AM: 95% of flights arrived on time, against 74% for departures after 9 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 PWM?
- Republic, with a season-adjusted 84% chance of operating and arriving on time over 810 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 PWM?
- December (81% on time); the best was April (97%), 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
- PWM to IAD (return)
- IAD to ATL 78%
- IAD to DEN 81%
- IAD to SFO 79%
- IAD to LAX 80%
- IAD to MCO 81%
- IAD to CLT 83%
- IAD to ORD 75%
- IAD to SEA 76%
- IAD to DFW 77%
- IAD to IAH 83%
- IAD to BOS 75%
- IAD to EWR 73%
Most on-time flights from IAD on every route →
Live status: FAA delays and ground stops