Skip to content

All Products

Aviation Intelligence

Alerts & Airspace

Free Pilot Tools & Widgets

RC Aviation

Games & Learning

Weather Research & More

Pilot Resources

My Airports

Your shortcuts, saved on this device. Search to add an airport.

No airports saved yet. Add the fields you visit most.

Ask ATIS

Route on-time record

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

Portland (Portland International Jetport) to Dulles (Washington Dulles International Airport). 701 nonstop flights in Jun 2025 to May 2026, 85% arrived within 15 minutes and 2.1% were cancelled. The most reliable flight number was Republic 3465 at 9:55 AM.

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

Find me the most reliable flights fromtoonreturning(optional)

PWM → IAD

Portland to Dulles: 701 nonstop flights a year

On time (12 months)

85%

Cancelled

2.1%

avg delay 11 min

Best time to leave

9 AM to noon

95% on time vs 78% 6 to 9 PM

Most reliable airline

Republic

83% chance on time

Check PWM to IAD fares

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 · Republic 3465 · sold as American Eagle, Delta Connection or United Express

    9:55 AM → 11:46 AM1h 51m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Republic 3701; its record covers all of them.

    93%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    1 min
    • Arrived on time 100% of the time (29 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (9 AM to noon: 95% on time; 6 to 9 PM: 78%).

    Limited track record · 29 flights

    Find 9:55 AM flight fares Opens this date on Aviasales

  2. #2 · United 1926

    5:15 AM → 7:00 AM1h 45m nonstop

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

    90%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (10 flights, Jun 2025 to May 2026).

    Limited track record · 10 flights

    Find United 1926 fares Opens this date on Aviasales

  3. #3 · Republic 3522 · sold as American Eagle, Delta Connection or United Express

    5:30 AM → 7:22 AM1h 52m nonstop

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

    89%

    chance on time

    On time (history)
    95%
    Cancelled
    0.0%
    Avg arrival delay
    1 min
    • Arrived on time 95% of the time (20 flights, Jun 2025 to May 2026).

    Limited track record · 20 flights

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

  4. #4 · Republic 3709 · sold as American Eagle, Delta Connection or United Express

    2:08 PM → 4:14 PM2h 06m nonstop

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

    84%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 100% of the time (17 flights, Jun 2025 to May 2026).
    • 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 · 17 flights

    Find 2:08 PM flight fares Opens this date on Aviasales

  5. #5 · Republic 3582 · sold as American Eagle, Delta Connection or United Express

    7:10 PM → 9:11 PM2h 01m nonstop

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

    79%

    chance on time

    On time (history)
    81%
    Cancelled
    1.1%
    Avg arrival delay
    13 min
    • Arrived on time 81% of the time (174 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 78% on time; 9 AM to noon: 95%).
    • 72% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 174 flights

    Find 7:10 PM flight fares Opens this date on Aviasales

  6. #6 · Republic 3459 · sold as American Eagle, Delta Connection or United Express

    2:20 PM → 4:30 PM2h 10m nonstop

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

    79%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 89% of the time (9 flights, Jun 2025 to May 2026).
    • 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 · 9 flights

    Find 2:20 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)83%

    680 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 AM94%

    136 flights · avg delay 3 min

  • 9 AM to noon95%

    165 flights · avg delay 3 min

  • Noon to 3 PM78%

    192 flights · avg delay 16 min

  • 6 to 9 PM78%

    208 flights · avg delay 17 min

Best day: Friday (89%). Worst: Monday (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.

J
86
F
98
M
93
A
-
M
91
J
83
J
82
A
87
S
86
O
88
N
91
D
86

What delays this route

  • Late-arriving aircraft48%
  • Air traffic control and airport volume33%
  • Airline (crew, maintenance, boarding)12%
  • 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

Finding the most reliable connections from PWM to IAD…

PWM to IAD questions

What time of day is best to fly PWM to IAD?
9 AM to noon: 95% of flights arrived on time, against 78% for departures 6 to 9 PM.
Which airline is most on time from PWM to IAD?
Republic, with a season-adjusted 83% chance of operating and arriving on time over 680 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 PWM to IAD?
July (82% on time); the best was February (98%), 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 PWM

Live status: FAA delays and ground stops