The cheapest times to fly from BOI to SJO are

  • January 8th to March 4th (except the week of February 12th)
  • August 6th to December 9th (except the week of November 19th)

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 SJO is mid to late September. Prices can be as high as $1339 for Friday flights during late December, or as low as $558 for Tuesday flights around mid to late September.


When to Fly to San José

Flying from Boise, ID (BOI) to San Jose (SJO) will usually cost between $571 to $986 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid to late September with an average ticket price of $572. Due to high demand the most expensive time to fly is late December, with an average price of $1031. Planning your trip to low-cost times can easily save you $460 on economy flights and even more on first-class flights. Generally, any price below $669 can be considered a good price for a round-trip BOI to SJO flight.

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

BOI to SJO Flight Prices

Compared to other flights, the BOI to SJO flight is cheaper than the average and costs less than the average flight leaving from Boise. The average price per mile (for a direct flight) is $0.14, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Fridays are the most expensive days to fly to San José, and Sundays are the most expensive days to return to Boise. Selecting flights on the least expensive days could save you up to $131 (14%) 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 $671. Return trip prices are from the SJO 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 SJO can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 6 hour 24 minutes may not be realistic.


Flight Hacking BOI to SJO

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 SJO — but Champion Traveler does!

Hack #1: Los Angeles, CA (BOI > LAX > SJO)

  • Price for both tickets: $598
  • Average savings: $71 (10.55%)

See BOI to LAX flights

Hack #2: Las Vegas, NV (BOI > LAS > SJO)

  • Price for both tickets: $609
  • Average savings: $60 (8.9%)

See BOI to LAS flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 9 major airlines flying this route most often: Aeromexico, Air Canada, Alaska, American, Avianca, COPA, Delta, Southwest, United, and potentially more during busy seasons.

How far away is it from Juan Santamaria International Airport to Boise Air Terminal Airport?

The distance between the two airports is roughly 3009 miles or 4843 kilometers.

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

The real-world flight time for a nonstop BOI to SJO flight is about 6 hour 24 minutes.

How many flights go between Boise, ID and San Jose?

It depends on the day of the week and the date, but a typical day might have around 79 available flights from BOI to SJO.


Airport Location Info


Departing Airport

Origination codeBOI
Origination airport nameBoise Air Terminal Airport
CityBoise, ID
Countrythe United States

Return Airport

Destination codeSJO
Destination airport nameJuan Santamaria International Airport
CitySan Jose
CountryCosta Rica


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.