FCO→DEN

United Airlines is the only carrier the DOT report shows on FCO to DEN, with 359 flights and an average of 227 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 July 2025, the busiest month of the window, and 0 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 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

Denver International is scored on this site from the DOT's domestic data: 76.6% of its 319,681 domestic departures arrived on time over the last twelve months, with delayed flights running about an hour late, and 0.78% 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 DEN 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.

Denver International (DEN) 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 Denver 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 DEN is covered only when the carrier is EU based. The sector is about 5,550 miles, 8,930 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 DEN 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 77% on time domestically. Leave two hours for any onward connection at DEN; immigration comes before the connecting flight.

• Rome Fiumicino (FCO): every US route
• Denver International (DEN) 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 DEN, from London1,848 flights
• FRA to DEN, from Frankfurt1,329 flights
• MUC to DEN, from Munich1,239 flights
• KEF to DEN, from Reykjavík808 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.