The cheapest times to fly from SID to BIL are

  • January 8th to March 25th
  • April 16th to June 17th
  • September 17th to October 7th
  • November 5th to December 9th (except the weeks of November 12th and November 26th)

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 SID to BIL is late January. Prices can be as high as $5020 for Sunday flights during early August, or as low as $1743 for Wednesday flights around late January.


When to Fly to Billings

Flying from Sal Island (SID) to Billings, MT (BIL) will usually cost between $1814 to $3713 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late January with an average ticket price of $1819. Due to high demand the most expensive time to fly is early August, with an average price of $4110. Planning your trip to low-cost times can easily save you $2291 on economy flights and even more on first-class flights. Generally, any price below $2116 can be considered a good price for a round-trip SID to BIL flight.

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

SID to BIL Flight Prices

Compared to other flights, the SID to BIL flight is more expensive than the average and costs less than the average flight leaving from Sal. The average price per mile (for a direct flight) is $0.25, which is below average.


Flight Prices by Day of the Week

Wednesday is usually the cheapest day to fly to BIL, and Monday the cheapest day to fly back into SID. Sundays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $833 (27%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Wednesday and returning a week later will cost an average of $1958. Return trip prices are from the BIL to SID 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 SID to BIL can generally find a 0-layover flight. Because there is a direct flight option the real-world direct flight time of 10 hour 19 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 SID to BIL while comparing.

Destination alternative #1: Yellowstone Regional Airport (COD) in Cody, WY

  • 92 miles (148 km) away from BIL
  • Usually 1.32% less expensive than BIL
  • Nonstop flights available

See SID to COD flights


Flight Hacking SID to BIL

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 SID to BIL — but Champion Traveler does!

Hack #1: Boston, MA (SID > BOS > BIL)

  • Price for both tickets: $1466
  • Average savings: $651 (30.74%)

See SID to MAN flights

Hack #2: Manchester (SID > MAN > BIL)

  • Price for both tickets: $1518
  • Average savings: $598 (28.26%)

See SID to BOS flights

Hack #3: London (SID > LHR > BIL)

  • Price for both tickets: $1621
  • Average savings: $495 (23.39%)

See SID to LHR flights


Flight Questions Answered

Still have questions about flying from SID to BIL? We’ve got answers.

Which airlines fly this route?

You can find 12 major airlines flying this route most often: Air Canada, Air France, American, Austrian, Azores Airlines, Brussels Airlines, Delta, KLM, Lufthansa, Tap Air Portugal, United, Virgin Atlantic, and potentially more during busy seasons.

How far away is it from Billings Logan International Airport to Amilcar Cabral International Airport?

The distance between the two airports is roughly 5185 miles or 8344 kilometers.

How long does it take to fly from SID to BIL?

The real-world flight time for a nonstop SID to BIL flight is about 10 hour 19 minutes.

How many flights go between Sal Island and Billings, MT?

It depends on the day of the week and the date, but a typical day might have around 23 available flights from SID to BIL.


Airport Location Info


Departing Airport

Origination code SID
Origination airport name Amilcar Cabral International Airport
City Sal Island
Country Cape Verde
Latitude 16.7
Longitude -22.9

Return Airport

Destination code BIL
Destination airport name Billings Logan International Airport
City Billings, MT
Country the United States
Latitude 45.8
Longitude -108.5


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.