LIS→IAD

TAP Air Portugal flew 63% of the 1,678 flights between LIS and IAD in the DOT's count, with United Airlines on 625. Loads averaged 173 passengers a flight, which on this route means wide-body aircraft nearly full.

The DOT's international report puts 182 flights on the pair in July 2025, the busiest month of the window, and 60 in February 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 Lisbon as a whole, every airline and every destination: 57.5% of departures and 72.3% of arrivals within 15 minutes of schedule from 1 January to 21 October 2026, with 96.6% of scheduled flights operated. The last seven days ran at 57.5% for departures, in line with the year. Air traffic flow management delay attributed to the airport averaged 1.8 minutes per arriving flight this year, 1.2 over the last week.

Every US route from Lisbon, 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 LIS 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 Lisbon 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 3,583 miles, 5,765 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 LIS to IAD without a route record, and this site does not invent one. What the three sources support: about two departures a day in each direction, a choice of two carriers, a departure airport that gets 58% 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.

• Lisbon (LIS): every US route
• Washington Dulles International (IAD) delay statistics
• LIS to EWR, Newark (EWR)2,069 flights
• LIS to BOS, Boston (BOS)1,889 flights
• LIS to JFK, New York (JFK)1,410 flights
• LIS to MIA, Miami (MIA)1,033 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

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