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San Juan

$534+ Cheap flights from Missoula (MSO) to San Juan

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
MSO — SJU
Feb 19 — Feb 261
Thu 2/19
Thu 2/26
1 adult, Economy
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Cheap flight deals from Missoula to San Juan

Cheapest flights from Missoula to San Juan
Explore the most affordable flight options available from Missoula to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 20, 2026.

This United Airlines deal was found by Cheapflights users on 1/18. 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.
Sat 10/176:15 am
MSO
-
SJU
1 stop9h 15m
United Airlines
Tue 10/201:05 am
SJU
-
MSO
2 stops12h 29m
United Airlines
Deal found 1/18$534
This American Airlines deal was found by Cheapflights users on 1/19. 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 2/241:20 pm
MSO
-
SJU
2 stops17h 40m
American Airlines
Sat 2/287:00 am
SJU
-
MSO
2 stops17h 56m
American Airlines
Deal found 1/19$591
This American Airlines deal was found by Cheapflights users on 1/19. 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.
Sat 2/71:21 pm
MSO
-
SJU
2 stops18h 27m
American Airlines
Tue 2/106:00 am
SJU
-
MSO
2 stops17h 45m
American Airlines
Deal found 1/19$629
This American Airlines deal was found by Cheapflights users on 1/18. 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.
Mon 2/166:15 am
MSO
-
SJU
1 stop14h 16m
American Airlines
Mon 2/237:01 pm
SJU
-
MSO
2 stops20h 49m
American Airlines
Deal found 1/18$664
This American Airlines deal was found by Cheapflights users on 1/17. 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.
Thu 2/266:15 am
MSO
-
SJU
1 stop14h 16m
American Airlines
Sun 3/86:33 am
SJU
-
MSO
1 stop17h 23m
American Airlines
Deal found 1/17$674
This United Airlines deal was found by Cheapflights users on 1/18. 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.
Mon 2/26:00 am
MSO
-
SJU
1 stop9h 25m
United Airlines
Fri 2/62:25 pm
SJU
-
MSO
1 stop10h 26m
United Airlines
Deal found 1/18$706
This American Airlines deal was found by Cheapflights users on 1/18. 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.
Fri 3/276:15 am
MSO
-
SJU
1 stop14h 16m
American Airlines
Tue 4/74:25 pm
SJU
-
MSO
2 stops22h 13m
American Airlines
Deal found 1/18$749
This American Airlines deal was found by Cheapflights users on 1/18. 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.
Thu 4/21:20 pm
MSO
-
SJU
2 stops17h 40m
American Airlines
Thu 4/910:03 am
SJU
-
MSO
2 stops13h 42m
American Airlines
Deal found 1/18$759
This American Airlines deal was found by Cheapflights users on 1/18. 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.
Fri 3/276:15 am
MSO
-
SJU
1 stop14h 16m
American Airlines
Mon 4/66:33 am
SJU
-
MSO
1 stop17h 23m
American Airlines
Deal found 1/18$761
This United Airlines deal was found by Cheapflights users on 1/19. 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.
Sat 2/76:00 am
MSO
-
SJU
1 stop9h 25m
United Airlines
Tue 2/102:25 pm
SJU
-
MSO
1 stop10h 26m
United Airlines
Deal found 1/19$764
This United Airlines deal was found by Cheapflights users on 1/20. 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.
Mon 2/166:15 am
MSO
-
SJU
3 stops36h 11m
United Airlines
Mon 2/238:05 am
SJU
-
MSO
2 stops16h 52m
United Airlines
Deal found 1/20$771

Find flight deals from Missoula to San Juan

Discover tips and strategies to find the most affordable flight options for your journey from Missoula (MSO) 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 January 20, 2026.

Round-trip from

$534
(United Airlines)

Popular in

December

Cheapest in

October

Average price

$1,245
From Missoula Johnson-Bell Field to San Juan
Search Deals
Highest demand for flights based on searches. 24% potential increase in price ($266 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($61 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Missoula 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 January 20, 2026.
Use the filters below to find and compare flights from Missoula to San Juan that are best for you.

Fly from

Missoula

Fly to

San Juan

Route

Depart

Return

Price

MissoulaSan Juan

MSO - SJU

MSOSJU

Missoula Johnson-Bell Field

Tue 2/24

6:15 am-11:31 pm

1 stop14h 16m

San Juan Luis Munoz Marin Intl

Sat 2/28

7:00 am-9:56 pm

2 stops17h 56m

$591

MissoulaSan Juan

MSO - SJU

MSOSJU

Missoula Johnson-Bell Field

Sat 2/7

7:00 am-10:26 pm

1 stop12h 26m

San Juan Luis Munoz Marin Intl

Tue 2/10

6:00 am-8:45 pm

2 stops17h 45m

$629

MissoulaSan Juan

MSO - SJU

MSOSJU

Missoula Johnson-Bell Field

Mon 2/16

6:15 am-11:31 pm

1 stop14h 16m

San Juan Luis Munoz Marin Intl

Mon 2/23

7:01 pm-12:50 pm

2 stops20h 49m

$664

MissoulaSan Juan

MSO - SJU

MSOSJU

Missoula Johnson-Bell Field

Mon 2/2

6:00 am-6:25 pm

1 stop9h 25m

San Juan Luis Munoz Marin Intl

Fri 2/6

2:25 pm-9:51 pm

1 stop10h 26m

$706

MissoulaSan Juan

MSO - SJU

MSOSJU

Missoula Johnson-Bell Field

Mon 2/2

6:18 pm-1:05 pm

2 stops15h 47m

San Juan Luis Munoz Marin Intl

Fri 2/6

2:15 pm-12:28 am

2 stops13h 13m

$706

MissoulaSan Juan

MSO - SJU

MSOSJU

Missoula Johnson-Bell Field

Thu 4/2

1:20 pm-4:24 am

1 stop13h 04m

San Juan Luis Munoz Marin Intl

Thu 4/9

6:47 am-9:45 pm

1 stop16h 58m

$759

MissoulaSan Juan

MSO - SJU

MSOSJU

Missoula Johnson-Bell Field

Thu 2/26

6:15 am-11:31 pm

1 stop14h 16m

San Juan Luis Munoz Marin Intl

Sun 3/8

6:01 pm-12:50 pm

2 stops20h 49m

$759

MissoulaSan Juan

MSO - SJU

MSOSJU

Missoula Johnson-Bell Field

Sat 2/7

6:00 am-6:25 pm

1 stop9h 25m

San Juan Luis Munoz Marin Intl

Tue 2/10

2:25 pm-9:51 pm

1 stop10h 26m

$764

MissoulaSan Juan

MSO - SJU

MSOSJU

Missoula Johnson-Bell Field

Fri 3/27

6:15 am-10:31 pm

1 stop14h 16m

San Juan Luis Munoz Marin Intl

Wed 4/8

3:44 pm-12:38 pm

2 stops22h 54m

$836

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/19

Best time to book a flight from Missoula to San Juan

Have a flexible travel schedule? Discover the best time to fly to San Juan from Missoula 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 Missoula to San Juan

How much does it cost to fly round-trip from Missoula 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 January 20, 2026.
Read through reviews of airlines operating flights from Missoula to San Juan, such as United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,183 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Crew

8.1

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,183 reviews
United Airlines
7.4
Good
9,183 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Crew

8.1

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

Related info for your journey

Find useful and relevant information for your journey from Missoula 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 Missoula to San Juan?

    Missoula Johnson-Bell Field (MSO) is the airport you will fly out of if you book a flight from Missoula to San Juan. You should not have trouble finding flights to San Juan from Johnson-Bell Field; the airport handles an average of 0 outbound flights to San Juan per day. You should also have plenty of airline options to choose from since 1 airline has flights from the Missoula airport to San Juan. It is only a 5.5 mi journey to Johnson-Bell Field (MSO) from Missoula’s city center.

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

    For as low as $591, American Airlines can have you in San Juan from Missoula in 14h 16m. There are 3342 mi between Missoula and San Juan.

  • What is the cheapest airline to fly from Missoula to San Juan round-trip?

    According to our current data, United Airlines ($442), offers the cheapest pricing from Missoula to San Juan. Users have found that United Airlines is 45% cheaper than the other options available to this destination.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Missoula 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.

See more FAQs

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Alternative routes for Missoula to San Juan

See prices for flight routes from nearby airports that may be better suited for you.
Bozeman to Luis Munoz Marin Intl flights
Missoula to Luis Munoz Marin Intl flights
Billings to Luis Munoz Marin Intl flights
Kalispell to Luis Munoz Marin Intl flights

Top airline flying from Missoula to San Juan

Discover the top airline that operate flights from Missoula 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 January 20, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$442Average$784FlexibilityNo cancel feeOn-time69%

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