FCO→SEA

Alaska Airlines flew 67% of the 190 flights between FCO and SEA in the DOT's count, with Delta Air Lines on 63. Loads averaged 203 passengers a flight, which on this route means wide-body aircraft nearly full.

The DOT's international report puts 94 flights on the pair in June 2026, 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 Rome Fiumicino as a whole, every airline and every destination: 64.0% of departures and 76.0% of arrivals within 15 minutes of schedule from 1 January to 21 October 2026, with 96.8% of scheduled flights operated. The last seven days ran at 49.8% for departures, 14 points worse than the year so far. Air traffic flow management delay attributed to the airport averaged 0.1 minutes per arriving flight this year, 0.1 over the last week.

Every US route from Rome Fiumicino, and its full punctuality record

Seattle-Tacoma International is scored on this site from the DOT's domestic data: 79.5% of its 164,759 domestic departures arrived on time over the last twelve months, with delayed flights running about an hour late, and 0.93% 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 SEA reaches a flight from FCO 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.

Seattle-Tacoma International (SEA) delay statistics, hour by hour and month by month

Every flight that departs Rome Fiumicino falls under Regulation (EC) 261/2004, whichever airline flies it and wherever it lands. If it arrives at Seattle-Tacoma 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 SEA is covered only when the carrier is EU based. The sector is about 5,673 miles, 9,128 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 FCO to SEA without a route record, and this site does not invent one. What the three sources support: about two departures a week in each direction, a choice of two carriers, a departure airport that gets 64% of its departures away on time and an arrival airport that runs 80% on time domestically. Leave two hours for any onward connection at SEA; immigration comes before the connecting flight.

• Rome Fiumicino (FCO): every US route
• Seattle-Tacoma International (SEA) delay statistics
• FCO to JFK, New York (JFK)3,990 flights
• FCO to ATL, Atlanta (ATL)1,355 flights
• FCO to IAD, Washington (IAD)1,247 flights
• FCO to EWR, Newark (EWR)1,213 flights
• LHR to SEA, from London2,643 flights
• KEF to SEA, from Reykjavík1,413 flights
• AMS to SEA, from Amsterdam1,139 flights
• CDG to SEA, from Paris1,023 flights
• Every Europe-to-US route and airport

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