HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Juan

$243+ Cheap flights from Boise (BOI) to San Juan

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/16. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — SJU
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Boise to San Juan with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Boise Air Term. Gowen Fld to San Juan are usually found in October or September, booked 60 days in advance, depart on a Monday or Thursday and return on a Monday

Cheap flight deals from Boise to San Juan

Discover tips and strategies to find the most affordable flight options for your journey from Boise (BOI) to San Juan (PR1). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 11, 2025.

Round-trip from

$395
(Delta)

One-way from

$243
(United Airlines)

Popular in

March

Cheapest in

October

Average price

$508
From Boise Air Term. Gowen Fld to San Juan
Search Deals
One-way flight from Boise Air Term. Gowen Fld to San Juan
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($39 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Boise to San Juan

Cheapest flights from Boise to San Juan
Explore the most affordable flight options available from Boise to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/175:00 amBOI - SJU
1 stop10h 30mUnited Airlines
Thu 10/231:05 amSJU - BOI
2 stops14h 28mUnited Airlines
Deal found 9/10$395
This United Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/147:00 amBOI - SJU
1 stop8h 30mUnited Airlines
Tue 10/141:05 amSJU - BOI
2 stops14h 28mUnited Airlines
Deal found 9/10$422
This American Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/296:40 amBOI - SJU
2 stops13h 30mAmerican Airlines
Tue 11/47:00 amSJU - BOI
1 stop18h 32mAmerican Airlines
Deal found 9/11$423
This American Airlines deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/74:40 pmBOI - SJU
2 stops18h 04mAmerican Airlines
Tue 10/147:45 amSJU - BOI
2 stops17h 11mAmerican Airlines
Deal found 9/9$498
This Southwest deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/305:00 amBOI - SJU
2 stops12h 25mSouthwest
Sun 11/25:40 amSJU - BOI
2 stops12h 30mSouthwest
Deal found 9/11$511
This Delta deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2911:35 pmBOI - SJU
1 stop11h 42mDelta
Tue 12/91:57 pmSJU - BOI
2 stops13h 13mDelta
Deal found 9/10$540
This Southwest deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/146:20 amBOI - SJU
2 stops12h 25mSouthwest
Wed 10/157:40 amSJU - BOI
2 stops16h 35mSouthwest
Deal found 9/10$543
This American Airlines deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/231:57 pmBOI - SJU
2 stops19h 14mAmerican Airlines
Tue 9/304:43 pmSJU - BOI
2 stops21h 44mAmerican Airlines
Deal found 9/9$548
This United Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/177:05 pmBOI - SJU
2 stops14h 55mUnited Airlines
Wed 10/221:05 amSJU - BOI
2 stops14h 25mUnited Airlines
Deal found 9/10$566

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boise to San Juan that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from Boise to San Juan that are best for you.

Fly from

Boise

Fly to

San Juan

Route

Depart

Return

Price

BoiseSan Juan

BOI - SJU

BOISJU

Boise Air Term. Gowen Fld

Fri 10/17

7:45 pm-2:11 pm

2 stops16h 26m

San Juan Luis Munoz Marin Intl

Fri 10/24

2:22 pm-11:56 pm

2 stops11h 34m

$395

BoiseSan Juan

BOI - SJU

BOISJU

Boise Air Term. Gowen Fld

Wed 10/29

5:25 am-11:56 pm

2 stops16h 31m

San Juan Luis Munoz Marin Intl

Tue 11/4

7:00 am-8:16 pm

2 stops16h 16m

$395

BoiseSan Juan

BOI - SJU

BOISJU

Boise Air Term. Gowen Fld

Sat 3/7

7:30 pm-4:29 pm

2 stops17h 59m

San Juan Luis Munoz Marin Intl

Wed 3/11

3:25 pm-11:42 pm

1 stop10h 17m

$473

BoiseSan Juan

BOI - SJU

BOISJU

Boise Air Term. Gowen Fld

Thu 10/30

5:00 am-7:25 pm

2 stops12h 25m

San Juan Luis Munoz Marin Intl

Sun 11/2

5:40 am-3:10 pm

2 stops12h 30m

$511

BoiseSan Juan

BOI - SJU

BOISJU

Boise Air Term. Gowen Fld

Tue 3/3

1:48 pm-4:55 am

1 stop12h 07m

San Juan Luis Munoz Marin Intl

Wed 3/4

4:25 pm-1:15 pm

2 stops23h 50m

$528

BoiseSan Juan

BOI - SJU

BOISJU

Boise Air Term. Gowen Fld

Sat 11/29

11:35 pm-2:17 pm

1 stop11h 42m

San Juan Luis Munoz Marin Intl

Tue 12/9

1:57 pm-12:10 am

2 stops13h 13m

$540

BoiseSan Juan

BOI - SJU

BOISJU

Boise Air Term. Gowen Fld

Sat 3/7

6:48 am-12:36 am

2 stops14h 48m

San Juan Luis Munoz Marin Intl

Tue 3/10

1:05 am-1:30 pm

2 stops14h 25m

$543

BoiseSan Juan

BOI - SJU

BOISJU

Boise Air Term. Gowen Fld

Thu 11/13

5:40 pm-11:00 am

2 stops14h 20m

San Juan Luis Munoz Marin Intl

Mon 11/17

5:45 am-3:05 pm

2 stops12h 20m

$548

BoiseSan Juan

BOI - SJU

BOISJU

Boise Air Term. Gowen Fld

Tue 10/14

5:00 am-8:38 pm

2 stops13h 38m

San Juan Luis Munoz Marin Intl

Tue 10/14

1:05 am-1:30 pm

2 stops14h 25m

$558

BoiseSan Juan

BOI - SJU

BOISJU

Boise Air Term. Gowen Fld

Thu 9/25

7:05 pm-1:45 pm

2 stops16h 40m

San Juan Luis Munoz Marin Intl

Mon 9/29

2:00 pm-10:30 pm

1 stop10h 30m

$585

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 14 results
1
2

Best time to book a flight from Boise to San Juan

Have a flexible travel schedule? Discover the best time to fly to San Juan from Boise with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Boise to San Juan

How far ahead should I book a flight from Boise to San Juan?

Use this chart to determine the optimal time to book a round-trip flight from Boise to San Juan. Price data was last updated on August 29, 2025.

The best time to book flights from Boise to San Juan is 59 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Boise to San Juan?

Currently, September is the cheapest month in which you can book a flight from Boise to San Juan (average of $254). Flying from Boise to San Juan in June is currently the most expensive (average of $339). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from BOI to SJU?

Find hourly flight availability from Boise to San Juan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

When flying from Boise to San Juan, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 29% versus a flight in the morning.

What is the cheapest day to fly from Boise to San Juan?

Use this chart to determine the cheapest time to fly round-trip from Boise to San Juan. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Boise to San Juan flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from Boise to San Juan?

Reviews of airlines servicing San Juan

Get insights into the airlines that provide service to San Juan. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Juan. Reviews last updated September 11, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines from Boise to San Juan have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from Boise to San Juan. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Boise to San Juan?

    For a flight from Boise to San Juan, you will be flying from Air Term. Gowen Fld. Boise Air Term. Gowen Fld (BOI) is just 3.3 mi from the center of the city. Air Term. Gowen Fld is the only Boise airport and it handles 0 outbound flights to San Juan per day. 4 airlines have flights to San Juan from Boise Air Term. Gowen Fld on a regular basis.

  • How long is the flight from Boise to San Juan?

    There are many flights that can get you from Boise to San Juan in 12h 07m. Fly via Delta, Southwest, or American Airlines to get the fastest option. The distance from Boise to San Juan is about 3374 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Boise to San Juan round-trip?

    Delta, at $287, was found to be the cheapest airline from Boise to San Juan.Alternate airlines to your destination round-trip include United Airlines and Southwest. Delta is priced at 54% lower than the current average price of a flight leaving 3 months from now.

  • Can I find deals for flights from Boise to San Juan that include hotel bookings?

    Yes. In addition to deals on Boise to San Juan flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Boise to San Juan?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boise to San Juan.

  • Can I find deals for business class flights from Boise to San Juan?

    Yes. Cheapflights offers flight deals from Boise to San Juan by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Boise to San Juan?

    Currently, September is the cheapest month in which you can book a flight from Boise to San Juan (average of $254). Flying from Boise to San Juan in June is currently the most expensive (average of $339). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Boise to San Juan

See prices for flight routes from nearby airports that may be better suited for you.
Boise to Luis Munoz Marin Intl flights
Spokane to Luis Munoz Marin Intl flights
Boise to Vieques flights

Top 4 airlines flying from Boise to San Juan

Discover the top 4 airlines that operate flights from Boise to San Juan. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$287Average$568FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$484Average$691FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$495Average$665FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$530Average$688FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.