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Route on-time record

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

Dulles (Washington Dulles International Airport) to West Palm Beach (Palm Beach International Airport). 334 nonstop flights in Jun 2025 to May 2026, 81% arrived within 15 minutes and 1.2% were cancelled. The most reliable flight number was United 324 at 6:45 PM.

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

IAD → PBI

Dulles to West Palm Beach: 334 nonstop flights a year

On time (12 months)

81%

Cancelled

1.2%

avg delay 15 min

Best time to leave

6 to 9 PM

90% on time vs 76% 9 AM to noon

Most reliable airline

Republic

81% chance on time

Check IAD to PBI 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 · United 324

    6:45 PM → 9:24 PM2h 39m nonstop

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

    85%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 89% of the time (53 flights, Jun 2025 to May 2026).
    • Never cancelled in 53 scheduled flights.
    • Leaves in this route's most on-time window (6 to 9 PM: 90% on time; 9 AM to noon: 76%).
    • 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 · 53 flights

    Find United 324 fares Opens this date on Aviasales

  2. #2 · United 2668

    8:50 AM → 11:34 AM2h 44m nonstop

    Local times, typical schedule. Last flown 2026-03-28.

    84%

    chance on time

    On time (history)
    91%
    Cancelled
    8.3%
    Avg arrival delay
    4 min
    • Arrived on time 91% of the time (22 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).
    • Lands inside PBI's trouble window: 84% of its 31 ground stops and delay programs started between 11 AM and 5 PM.
    • Short track record (22 flights), so its score leans on the airline's record at this hour.

    Limited track record · 22 flights

    Find United 2668 fares Opens this date on Aviasales

  3. #3 · United 1697

    8:35 AM → 11:14 AM2h 39m nonstop

    Local times, typical schedule. Last flown 2026-04-29.

    82%

    chance on time

    On time (history)
    84%
    Cancelled
    0.0%
    Avg arrival delay
    16 min
    • Arrived on time 84% of the time (32 flights, Jun 2025 to May 2026).
    • Never cancelled in 32 scheduled flights.
    • Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
    • Lands inside PBI's trouble window: 84% of its 31 ground stops and delay programs started between 11 AM and 5 PM.

    Limited track record · 32 flights

    Find United 1697 fares Opens this date on Aviasales

  4. #4 · United 1643

    5:47 PM → 8:34 PM2h 47m nonstop

    Local times, typical schedule. Last flown 2026-03-28.

    78%

    chance on time

    On time (history)
    79%
    Cancelled
    0.0%
    Avg arrival delay
    42 min
    • Arrived on time 79% of the time (24 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.
    • Short track record (24 flights), so its score leans on the airline's record at this hour.

    Limited track record · 24 flights

    Find United 1643 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)81%

    31 flights · 83% on time as flown · 1.0% cancel

  • United Airlines80%

    303 flights · 81% on time as flown · 1.3% cancel

On time by departure time

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

  • Before 9 AM87%

    56 flights · avg delay 11 min

  • 9 AM to noon76%

    93 flights · avg delay 16 min

  • Noon to 3 PM83%

    31 flights · avg delay 7 min

  • 3 to 6 PM78%

    102 flights · avg delay 24 min

  • 6 to 9 PM90%

    52 flights · avg delay 6 min

Best day: Tuesday (86%). Worst: Monday (76%).

Smarter routing

Nearby airports that run more on time

  • IAD → FLL 83% chance on time

    Washington Dulles International Airport to Fort Lauderdale Hollywood International Airport · 742 flights a year · 42 mi from your airports · yours: 80%

    Rank flightsFares

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
88
F
75
M
85
A
85
M
85
J
-
J
-
A
-
S
-
O
80
N
-
D
74

What delays this route

  • Late-arriving aircraft40%
  • Air traffic control and airport volume32%
  • Airline (crew, maintenance, boarding)23%
  • Severe weather4%

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 PBI questions

What time of day is best to fly IAD to PBI?
6 to 9 PM: 90% of flights arrived on time, against 76% for departures 9 AM to noon.
Which airline is most on time from IAD to PBI?
Republic, with a season-adjusted 81% chance of operating and arriving on time over 31 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 PBI?
December (74% on time); the best was January (88%), 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