The cheapest times to fly from CDG to SDY are

  • January 8th to January 21st
  • late February and early March
  • May 7th to July 29th (except the weeks of May 21st and May 28th)
  • August 20th to October 28th

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 CDG to SDY is mid to late August. Prices can be as high as $8014 for Monday flights during late March, or as low as $3733 for Thursday flights around mid to late August.


When to Fly to Sidney

Flying from Paris (CDG) to Sidney, MT (SDY) will usually cost between $4061 to $7833 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid to late August with an average ticket price of $4131. Due to high demand the most expensive time to fly is late March, with an average price of $7829. Planning your trip to low-cost times can easily save you $3698 on economy flights and even more on first-class flights. Generally, any price below $5540 can be considered a good price for a round-trip CDG to SDY flight.

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

CDG to SDY Flight Prices

Compared to other flights, the CDG to SDY flight is more expensive than the average and costs more than the average flight leaving from Paris. The average price per mile (for a direct flight) is $0.77, which is above average.


Flight Prices by Day of the Week

Thursday is usually the cheapest day to fly to SDY, and Saturday the cheapest day to fly back into CDG. Mondays are the most expensive days to fly to Sidney, and Tuesdays are the most expensive days to return to Paris. Selecting flights on the least expensive days could save you up to $1059 (16%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Thursday and returning a week later will cost an average of $5336. Return trip prices are from the SDY to CDG 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 CDG to SDY can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 8 hour 60 minutes may not be realistic.


Flight Hacking CDG 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 CDG to SDY — but Champion Traveler does!

Hack #1: San Francisco, CA (CDG > SFO > SDY)

  • Price for both tickets: $931
  • Average savings: $4610 (83.2%)

See CDG to LAX flights

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

  • Price for both tickets: $948
  • Average savings: $4593 (82.9%)

See CDG to SFO flights

Hack #3: Boston, MA (CDG > BOS > SDY)

  • Price for both tickets: $1065
  • Average savings: $4475 (80.78%)

See CDG to BOS flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 8 major airlines flying this route most often: Air France, Alaska, American, British Airways, Cape Air, Delta, KLM, United, and potentially more during busy seasons.

How far away is it from Sidney Richland Regional Airport to Paris Charles de Gaulle Airport?

The distance between the two airports is roughly 4453 miles or 7166 kilometers.

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

The real-world flight time for a nonstop CDG to SDY flight is about 8 hour 60 minutes.

How many flights go between Paris and Sidney, MT?

It depends on the day of the week and the date, but a typical day might have around 21 available flights from CDG to SDY.


Airport Location Info


Departing Airport

Origination code CDG
Origination airport name Paris Charles de Gaulle Airport
City Paris
Country France
Latitude 49
Longitude 2.6

Return Airport

Destination code SDY
Destination airport name Sidney Richland Regional Airport
City Sidney, MT
Country the United States
Latitude 47.7
Longitude -104.2


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.