The cheapest times to fly from BOI to SID are

  • January 8th to February 4th
  • March 26th to May 13th
  • August 20th to December 16th (except the week of October 22nd)

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 BOI to SID is late September. Prices can be as high as $10100 for Wednesday flights during early to mid August, or as low as $1734 for Tuesday flights around late September.


When to Fly to Sal

Flying from Boise, ID (BOI) to Sal Island (SID) will usually cost between $2084 to $7786 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late September with an average ticket price of $2222. Due to high demand the most expensive time to fly is early to mid August, with an average price of $8110. Planning your trip to low-cost times can easily save you $5888 on economy flights and even more on first-class flights. Generally, any price below $4991 can be considered a good price for a round-trip BOI to SID flight.

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

BOI to SID Flight Prices

Compared to other flights, the BOI to SID flight is more expensive than the average and costs more than the average flight leaving from Boise. The average price per mile (for a direct flight) is $0.56, which is above average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Wednesdays 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 $2434 (45%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $3260. Return trip prices are from the SID to BOI 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 BOI to SID can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 11 hour 2 minutes may not be realistic.


Flight Hacking BOI to SID

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 BOI to SID — but Champion Traveler does!

Hack #1: London (BOI > LHR > SID)

  • Price for both tickets: $1373
  • Average savings: $3618 (72.49%)

See BOI to LHR flights

Hack #2: Lyon (BOI > LYS > SID)

  • Price for both tickets: $1402
  • Average savings: $3589 (71.91%)

See BOI to LYS flights

Hack #3: Dublin (BOI > DUB > SID)

  • Price for both tickets: $1451
  • Average savings: $3541 (70.94%)

See BOI to DUB flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 10 major airlines flying this route most often: Air Canada, American, Austrian, Azores Airlines, Brussels Airlines, Delta, Iberia, Lufthansa, Tap Air Portugal, United, and potentially more during busy seasons.

How far away is it from Amilcar Cabral International Airport to Boise Air Terminal Airport?

The distance between the two airports is roughly 5586 miles or 8990 kilometers.

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

The real-world flight time for a nonstop BOI to SID flight is about 11 hour 2 minutes.

How many flights go between Boise, ID and Sal Island?

It depends on the day of the week and the date, but a typical day might have around 24 available flights from BOI to SID.


Airport Location Info


Departing Airport

Origination code BOI
Origination airport name Boise Air Terminal Airport
City Boise, ID
Country the United States
Latitude 43.6
Longitude -116.2

Return Airport

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


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.