ATH→IAD

United Airlines is the only carrier the DOT report shows on ATH to IAD, with 354 flights and an average of 223 passengers aboard each. A single-carrier route gives a delayed passenger no same-day alternative on the same ticket, which is worth knowing before booking a tight onward connection.

The DOT's international report puts 62 flights on the pair in August 2025, the busiest month of the window, and 0 in March 2026, the thinnest. A summer-to-winter swing of that size means the winter schedule is a different operation: fewer frequencies, so a cancellation leaves a longer wait for the next seat.

EUROCONTROL's figures for Athens as a whole, every airline and every destination: 63.9% of departures and 66.5% of arrivals within 15 minutes of schedule from 1 January to 21 October 2026, with 94.5% of scheduled flights operated. The last seven days ran at 70.0% for departures, 6 points better than the year so far. Air traffic flow management delay attributed to the airport averaged 4.1 minutes per arriving flight this year, 4.3 over the last week.

Every US route from Athens, and its full punctuality record

Washington Dulles International is scored on this site from the DOT's domestic data: 81.0% of its 57,762 domestic departures arrived on time over the last twelve months, with delayed flights running a little over an hour late, and 1.44% were cancelled. Those are domestic flights, not this route, but an arriving transatlantic flight shares the same runways, the same weather and the same ground delay programmes, so a bad day at IAD reaches a flight from ATH just as surely. The airport's own page has the hour-by-hour and month-by-month detail, and its live FAA status appears above when the FAA has something to say.

Washington Dulles International (IAD) delay statistics, hour by hour and month by month

Every flight that departs Athens falls under Regulation (EC) 261/2004, whichever airline flies it and wherever it lands. If it arrives at Washington Dulles International three hours or more late, or is cancelled with under 14 days' notice, and the cause was within the airline's control, each passenger is owed €600 (€300 if the airline got you there under four hours late), on top of rebooking and care. Weather, air traffic control restrictions and strikes outside the airline are the usual exemptions. The return flight from IAD is covered only when the carrier is EU based. The sector is about 5,156 miles, 8,296 km, which puts it in the top distance band.

Delayed three hours or more? Check a claim with Compensair →

There is no grade to give ATH to IAD without a route record, and this site does not invent one. What the three sources support: about three departures a week in each direction, a single carrier, a departure airport that gets 64% of its departures away on time and an arrival airport that runs 81% on time domestically. Leave two hours for any onward connection at IAD; immigration comes before the connecting flight.

• Athens (ATH): every US route
• Washington Dulles International (IAD) delay statistics
• ATH to JFK, New York (JFK)1,443 flights
• ATH to EWR, Newark (EWR)1,218 flights
• ATH to ORD, Chicago (ORD)668 flights
• ATH to ATL, Atlanta (ATL)644 flights
• LHR to IAD, from London3,880 flights
• FRA to IAD, from Frankfurt2,352 flights
• DUB to IAD, from Dublin2,342 flights
• CDG to IAD, from Paris2,247 flights
• Every Europe-to-US route and airport

Greece publishes no route-level punctuality, so this page cannot grade the route. The UK pages in this section can, because the CAA does.