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$531+ 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 1/8. Fares are subject to change and may not be available on all flights or dates of travel.
MSO — SJU
Jan 8 — Jan 151
Thu 1/8
Thu 1/15
1 adult, Economy
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Cheap flight deals from Missoula to San Juan

Best flights from Missoula to San Juan
Discover carefully curated flight deals from Missoula to San Juan that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 9, 2025.

This American Airlines deal was found by Cheapflights users on 12/8. 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 4/141:05 pmMSO - SJU
2 stops19h 55mAmerican Airlines
Sat 4/253:45 pmSJU - MSO
2 stops22h 40mAmerican Airlines
Deal found 12/8$531
This United Airlines deal was found by Cheapflights users on 12/6. 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 2/236:15 amMSO - SJU
1 stop9h 10mUnited Airlines
Thu 2/262:25 pmSJU - MSO
1 stop10h 32mUnited Airlines
Deal found 12/6$621
This American Airlines deal was found by Cheapflights users on 12/7. 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 1/81:21 pmMSO - SJU
2 stops20h 47mAmerican Airlines
Wed 1/216:00 amSJU - MSO
2 stops17h 45mAmerican Airlines
Deal found 12/7$531
This American Airlines deal was found by Cheapflights users on 12/7. 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 1/297:00 amMSO - SJU
2 stops13h 59mAmerican Airlines
Thu 2/127:00 pmSJU - MSO
2 stops20h 54mAmerican Airlines
Deal found 12/7$570

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 December 9, 2025.

Round-trip from

$531
(American Airlines)

Popular in

December

Cheapest in

October

Average price

$1,420
From Missoula Johnson-Bell Field to San Juan
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($254 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($59 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 9, 2025.
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 4/14

1:05 pm-11:00 am

2 stops19h 55m

San Juan Luis Munoz Marin Intl

Sat 4/25

3:45 pm-12:25 pm

2 stops22h 40m

$531

MissoulaSan Juan

MSO - SJU

MSOSJU

Missoula Johnson-Bell Field

Thu 1/8

1:21 pm-1:08 pm

2 stops20h 47m

San Juan Luis Munoz Marin Intl

Wed 1/21

6:00 am-8:45 pm

2 stops17h 45m

$531

MissoulaSan Juan

MSO - SJU

MSOSJU

Missoula Johnson-Bell Field

Thu 1/29

7:00 am-11:59 pm

2 stops13h 59m

San Juan Luis Munoz Marin Intl

Thu 2/12

7:00 pm-12:54 pm

2 stops20h 54m

$570

MissoulaSan Juan

MSO - SJU

MSOSJU

Missoula Johnson-Bell Field

Mon 2/23

6:15 am-6:25 pm

1 stop9h 10m

San Juan Luis Munoz Marin Intl

Thu 2/26

2:25 pm-9:57 pm

1 stop10h 32m

$621

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/8

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
No data available for this route at this time. Please check back soon.

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 December 9, 2025.
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
9,089 reviews

Boarding

7.7

Overall

7.4

Food

6.6

Entertainment

7.1

Crew

8.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
United Airlines
7.4
Good
9,089 reviews
United Airlines
7.4
Good
9,089 reviews

Boarding

7.7

Overall

7.4

Food

6.6

Entertainment

7.1

Crew

8.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.

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 $531, American Airlines can have you in San Juan from Missoula in 19h 55m. 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 46% 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
Kalispell to Luis Munoz Marin Intl flights
Billings to Luis Munoz Marin Intl flights
Missoula 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 December 9, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$531Average$805FlexibilityNo cancel feeOn-time69%

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