The cheapest times to fly from FCO to SDY are

  • September 3rd to September 30th (except the weeks of September 10th and September 17th)
  • November 12th to May 27th (except the weeks of November 19th, January 1st, March 26th, and May 7th)

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from FCO to SDY is early September. Prices can be as high as $8144 for Monday flights during late June, or as low as $3727 for Sunday flights around early September.


When to Fly to Sidney

Flying from Rome (FCO) to Sidney, MT (SDY) will usually cost between $3910 to $7834 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early September with an average ticket price of $3933. Due to high demand the most expensive time to fly is late June, with an average price of $7836. Planning your trip to low-cost times can easily save you $3903 on economy flights and even more on first-class flights. Generally, any price below $4279 can be considered a good price for a round-trip FCO to SDY flight.

See below for a graph of average weekly prices for the FCO to SDY route. All prices are for round-trip tickets in USD.

FCO to SDY Flight Prices

Compared to other flights, the FCO to SDY flight is more expensive than the average and costs more than the average flight leaving from Rome. The average price per mile (for a direct flight) is $0.52, which is above average.


Flight Prices by Day of the Week

Sunday is usually the cheapest day to fly to SDY, and Saturday the cheapest day to fly back into FCO. Mondays are the most expensive days to fly to Sidney, and Fridays are the most expensive days to return to Rome. Selecting flights on the least expensive days could save you up to $596 (11%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Sunday and returning a week later will cost an average of $4873. Return trip prices are from the SDY to FCO flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from FCO to SDY can generally find a 0-layover flight. Because there is a direct flight option the real-world direct flight time of 10 hour 14 minutes may be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is a nonstop flight from FCO to SDY while comparing.

Destination alternative #1: Minot International Airport (MOT) in Minot, ND

  • 140 miles (225 km) away from SDY
  • Usually 80.32% less expensive than SDY
  • 2-layover flights available

See FCO to MOT flights


Flight Hacking FCO to SDY

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from FCO to SDY — but Champion Traveler does!

Hack #1: Billings, MT (FCO > BIL > SDY)

  • Price for both tickets: $996
  • Average savings: $3283 (76.72%)

See FCO to LAX flights

Hack #2: Los Angeles, CA (FCO > LAX > SDY)

  • Price for both tickets: $1057
  • Average savings: $3222 (75.31%)

See FCO to BIL flights

Hack #3: San Francisco, CA (FCO > SFO > SDY)

  • Price for both tickets: $1122
  • Average savings: $3157 (73.79%)

See FCO to SFO flights


Flight Questions Answered

Still have questions about flying from FCO to SDY? We’ve got answers.

Which airlines fly this route?

You can find 9 major airlines flying this route most often: Air France, Alitalia, American, British Airways, Cape Air, Delta, KLM, Lufthansa, United, and potentially more during busy seasons.

How far away is it from Sidney Richland Regional Airport to Fiumicino Airport?

The distance between the two airports is roughly 5136 miles or 8266 kilometers.

How long does it take to fly from FCO to SDY?

The real-world flight time for a nonstop FCO to SDY flight is about 10 hour 14 minutes.

How many flights go between Rome and Sidney, MT?

It depends on the day of the week and the date, but a typical day might have around 15 available flights from FCO to SDY.


Airport Location Info


Departing Airport

Origination codeFCO
Origination airport nameFiumicino Airport

Return Airport

Destination codeSDY
Destination airport nameSidney Richland Regional Airport
CitySidney, MT
Countrythe United States


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.