Luis Munoz Marin Intl

$86+ Cheap flights from Milwaukee (MKE) to Luis Munoz Marin Intl (SJU)

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 2/7. Fares are subject to change and may not be available on all flights or dates of travel.
MKE — SJU
Jan 17 — Jan 241
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Milwaukee to Luis Munoz Marin Intl 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 Milwaukee-Mitchell to San Juan Luis Munoz Marin Intl are usually found in September or October, booked 82 days in advance, depart on a Tuesday or Monday and return on a Thursday

Cheap flight deals from Milwaukee to Luis Munoz Marin Intl

Cheapest flights from Milwaukee to Luis Munoz Marin Intl
Explore the most affordable flight options available from Milwaukee to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

This Priceline deal was found by Cheapflights users on 12/17. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/207:48 pmMKE - SJU
1 stop29h 02mFrontier
Thu 12/259:37 pmSJU - MKE
1 stop21h 44mFrontier
Deal found 12/17$264
This Priceline deal was found by Cheapflights users on 12/16. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/218:06 pmMKE - SJU
1 stop28h 44mFrontier
Thu 12/259:37 pmSJU - MKE
1 stop21h 44mFrontier
Deal found 12/16$314
This Frontier deal was found by Cheapflights users on 12/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/207:48 pmMKE - SJU
1 stop11h 10mFrontier
Sun 12/213:55 amSJU - MKE
1 stop9h 18mFrontier
Deal found 12/15$334
This Priceline deal was found by Cheapflights users on 12/17. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/218:06 pmMKE - SJU
1 stop11h 17mFrontier
Tue 12/236:00 amSJU - MKE
1 stop14h 26mFrontier
Deal found 12/17$355
This Travelocity deal was found by Cheapflights users on 12/15. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/237:21 pmMKE - SJU
1 stop23h 06mFrontier
Fri 12/2610:33 amSJU - MKE
1 stop8h 48mFrontier
Deal found 12/15$359
This Frontier deal was found by Cheapflights users on 12/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/207:48 pmMKE - SJU
1 stop11h 10mFrontier
Tue 12/2310:33 amSJU - MKE
1 stop9h 53mFrontier
Deal found 12/15$375
This Priceline deal was found by Cheapflights users on 12/17. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/218:06 pmMKE - SJU
1 stop11h 17mFrontier
Fri 12/263:55 amSJU - MKE
1 stop17h 08mFrontier
Deal found 12/17$389
This American Airlines deal was found by Cheapflights users on 12/16. 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 12/306:27 pmMKE - SJU
1 stop15h 12mAmerican Airlines
Fri 1/96:30 amSJU - MKE
1 stop15h 54mAmerican Airlines
Deal found 12/16$390
This United Airlines deal was found by Cheapflights users on 12/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/187:08 amMKE - SJU
2 stops12h 18mUnited Airlines
Sun 12/217:45 amSJU - MKE
1 stop9h 07mUnited Airlines
Deal found 12/17$399
This Priceline deal was found by Cheapflights users on 12/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/2610:48 amMKE - SJU
1 stop9h 56mFrontier
Mon 12/299:37 pmSJU - MKE
1 stop22h 49mFrontier
Deal found 12/15$405
This Priceline deal was found by Cheapflights users on 12/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/207:48 pmMKE - SJU
1 stop11h 10mFrontier
Sat 12/279:49 amSJU - MKE
1 stop11h 14mFrontier
Deal found 12/15$409

Find flight deals from Milwaukee to Luis Munoz Marin Intl

Discover tips and strategies to find the most affordable flight options for your journey from Milwaukee (MKE) to Luis Munoz Marin Intl (SJU). 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 18, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$235
(American Airlines)

One-way from

$86
(Priceline)

Popular in

June

Cheapest in

September

Average price

$532
Provider with most accurate pricing for Milwaukee-Mitchell-San Juan Luis Munoz Marin Intl flight deals.
Provider most trusted by Cheapflights users for Milwaukee-Mitchell-San Juan Luis Munoz Marin Intl flights.
From Milwaukee-Mitchell to San Juan Luis Munoz Marin Intl
One-way flight from Milwaukee-Mitchell to San Juan Luis Munoz Marin Intl
Highest demand for flights based on searches. 9% potential increase in price ($48 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Average for round-trip flights in December 2025

Cheapflights Fare Finder

 
Customize your flight search to find flights from Milwaukee to Luis Munoz Marin Intl 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 18, 2025.
Use the filters below to find and compare flights from Milwaukee to San Juan Luis Munoz Marin Intl Airport that are best for you.

Fly from

Milwaukee

Fly to

Luis Munoz Marin Intl

Route

Depart

Return

Price

MilwaukeeSan Juan

MKE - SJU

MKESJU

Milwaukee-Mitchell

Sun 1/4

8:06 pm-2:50 am

1 stop28h 44m

San Juan Luis Munoz Marin Intl

Sat 1/10

6:15 am-7:14 pm

1 stop14h 59m

$235

MilwaukeeSan Juan

MKE - SJU

MKESJU

Milwaukee-Mitchell

Tue 3/3

6:00 am-4:52 pm

2 stops8h 52m

San Juan Luis Munoz Marin Intl

Tue 3/10

3:12 pm-11:18 pm

1 stop9h 06m

$235

MilwaukeeSan Juan

MKE - SJU

MKESJU

Milwaukee-Mitchell

Tue 2/10

5:30 am-2:31 pm

1 stop7h 01m

San Juan Luis Munoz Marin Intl

Sat 2/14

6:15 am-1:16 pm

1 stop9h 01m

$235

MilwaukeeSan Juan

MKE - SJU

MKESJU

Milwaukee-Mitchell

Tue 3/3

6:00 am-3:40 pm

1 stop7h 40m

San Juan Luis Munoz Marin Intl

Tue 3/10

1:05 am-12:35 pm

2 stops12h 30m

$235

MilwaukeeSan Juan

MKE - SJU

MKESJU

Milwaukee-Mitchell

Tue 1/13

8:33 am-9:26 pm

2 stops10h 53m

San Juan Luis Munoz Marin Intl

Tue 1/20

2:05 am-10:46 am

1 stop10h 41m

$253

MilwaukeeSan Juan

MKE - SJU

MKESJU

Milwaukee-Mitchell

Thu 1/8

7:30 pm-8:54 am

1 stop11h 24m

San Juan Luis Munoz Marin Intl

Sat 1/17

8:57 am-6:47 pm

1 stop11h 50m

$289

MilwaukeeSan Juan

MKE - SJU

MKESJU

Milwaukee-Mitchell

Mon 2/2

11:30 am-12:36 am

2 stops11h 06m

San Juan Luis Munoz Marin Intl

Fri 2/6

2:15 pm-9:59 pm

2 stops9h 44m

$303

MilwaukeeSan Juan

MKE - SJU

MKESJU

Milwaukee-Mitchell

Thu 2/19

12:20 pm-11:58 pm

1 stop9h 38m

San Juan Luis Munoz Marin Intl

Wed 2/25

7:30 am-12:31 pm

1 stop7h 01m

$305

MilwaukeeSan Juan

MKE - SJU

MKESJU

Milwaukee-Mitchell

Sat 1/31

7:48 pm-9:54 am

1 stop12h 06m

San Juan Luis Munoz Marin Intl

Sat 2/7

8:00 am-6:53 pm

1 stop12h 53m

$306

MilwaukeeSan Juan

MKE - SJU

MKESJU

Milwaukee-Mitchell

Wed 3/11

7:30 am-8:49 pm

2 stops12h 19m

San Juan Luis Munoz Marin Intl

Sun 3/15

1:30 am-11:01 am

1 stop10h 31m

$308

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 20 results
1
2

Compare providers for flights from Milwaukee to Luis Munoz Marin Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Milwaukee to Luis Munoz Marin Intl in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Milwaukee-San Juan Luis Munoz Marin Intl Airport flights, users find the pricing of Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on Milwaukee-San Juan Luis Munoz Marin Intl Airport flight deals on Cheapflights vs. Mytrip >95% of the time. Price accuracy is based on data collected from Milwaukee-San Juan Luis Munoz Marin Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Milwaukee-San Juan Luis Munoz Marin Intl Airport flights, Cheapflights users trust Mytrip the most. Mytrip has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Milwaukee-San Juan Luis Munoz Marin Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Milwaukee to Luis Munoz Marin Intl

Have a flexible travel schedule? Discover the best time to fly to Luis Munoz Marin Intl from Milwaukee 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 Milwaukee to San Juan Luis Munoz Marin Intl Airport

How far ahead should I book a flight from Milwaukee to San Juan Luis Munoz Marin Intl Airport?

Use this chart to determine the optimal time to book a round-trip flight from Milwaukee to Luis Munoz Marin Intl. Price data was last updated on December 12, 2025.

The price you pay for your flight from Milwaukee to San Juan Luis Munoz Marin Intl Airport may vary depending on when you book. For the best chance of a lower fare, look to book 82 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Milwaukee to San Juan Luis Munoz Marin Intl Airport?

Currently, November is the cheapest month in which you can book a flight from Milwaukee to San Juan Luis Munoz Marin Intl Airport (average of $113). Flying from Milwaukee to San Juan Luis Munoz Marin Intl Airport in December is currently the most expensive (average of $221). 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 MKE to SJU?

Find hourly flight availability from Milwaukee to Luis Munoz Marin Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2025.

When flying from Milwaukee to San Juan Luis Munoz Marin Intl Airport, 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 21% versus a flight at noon.

What is the cheapest day to fly from Milwaukee to San Juan Luis Munoz Marin Intl Airport?

Use this chart to determine the cheapest time to fly round-trip from Milwaukee to Luis Munoz Marin Intl. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Milwaukee to San Juan Luis Munoz Marin Intl Airport flight should consider departing on Wednesday evenings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Luis Munoz Marin Intl

Get insights into the airlines that provide service to Luis Munoz Marin Intl. 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 Luis Munoz Marin Intl. Reviews last updated December 18, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Milwaukee to San Juan Luis Munoz Marin Intl Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Overall

7.9

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Overall

7.9

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Overall

7.9

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Overall

7.9

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Overall

7.9

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Overall

7.9

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

Find useful and relevant information for your journey from Milwaukee to Luis Munoz Marin Intl. 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 Milwaukee to San Juan Luis Munoz Marin Intl?

    For a flight from Milwaukee to San Juan Luis Munoz Marin Intl, you will be flying from Milwaukee-Mitchell. Milwaukee-Mitchell (MKE) is just 6.4 mi from the center of the city. Milwaukee-Mitchell is the only Milwaukee airport and it handles 0 outbound flights to San Juan Luis Munoz Marin Intl per day. 6 airlines have flights to San Juan Luis Munoz Marin Intl from Milwaukee-Mitchell on a regular basis.

  • How long is the flight from Milwaukee to San Juan Luis Munoz Marin Intl Airport?

    Airlines like Frontier, American Airlines, and Delta fly from Milwaukee to San Juan Luis Munoz Marin Intl Airport in about 7h 01m. The time it takes to get you to your destination can typically vary by up to 21h 43m. Airlines will cover a distance of 2120 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Milwaukee to San Juan Luis Munoz Marin Intl Airport round-trip?

    Flying on Delta is currently your cheapest option to San Juan Luis Munoz Marin Intl Airport, with prices starting at $124. Additional round-trip tickets that might be worth considering are offered by Frontier and United Airlines, with the lowest prices starting at $129 and $158, respectively. Delta is priced at 71% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Milwaukee to San Juan Luis Munoz Marin Intl Airport one-way?

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $43. However, be on the lookout for offers from Delta and United Airlines, as they are both options that can get you from Milwaukee to San Juan Luis Munoz Marin Intl Airport for a low price.

  • Where are the most common layover locations when flying from Milwaukee to San Juan Luis Munoz Marin Intl Airport?

  • What are some popular things to do or see while on a layover in Atlanta?

    Atlanta travelers tend to visit Georgia Aquarium, Fox Theatre, and Centennial Olympic Park more than anywhere else. Travelers on a layover in Atlanta can visit Georgia Aquarium, Fox Theatre, and Centennial Olympic Park, by traveling 8.6 mi, 9.3 mi, and 8.4 mi, respectively after landing at Atlanta Hartsfield-Jackson. Travelers in need of a car in Atlanta can rent one for about $53 per day.

  • Where are the least popular layover locations for Milwaukee to San Juan Luis Munoz Marin Intl Airport flights?

  • Can I find deals for flights from Milwaukee to Luis Munoz Marin Intl that include hotel bookings?

    Yes. In addition to deals on Milwaukee to Luis Munoz Marin Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Milwaukee to Luis Munoz Marin Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Milwaukee to Luis Munoz Marin Intl.

  • Can I find deals for business class flights from Milwaukee to Luis Munoz Marin Intl?

    Yes. Cheapflights offers flight deals from Milwaukee to Luis Munoz Marin Intl 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 Milwaukee to San Juan Luis Munoz Marin Intl Airport?

    Currently, November is the cheapest month in which you can book a flight from Milwaukee to San Juan Luis Munoz Marin Intl Airport (average of $113). Flying from Milwaukee to San Juan Luis Munoz Marin Intl Airport in December is currently the most expensive (average of $221). 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

Traveling to a place near San Juan Luis Munoz Marin Intl Airport?

Book flights to San Juan Luis Munoz Marin Intl Airport if you plan to visit one of these locations
Dorado
Fajardo
Rio Grande
Humacao
Luquillo
Bayamón

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.

Top 6 airlines flying from Milwaukee to Luis Munoz Marin Intl

Discover the top 6 airlines that operate flights from Milwaukee to Luis Munoz Marin Intl. 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 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$129Average$256FlexibilityNo cancel feeOn-time62%
DeltaCheapest$191Average$383FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$215Average$402FlexibilityNo cancel feeOn-time69%
Spirit AirlinesCheapest$226Average$406FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$274Average$483FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$315Average$543FlexibilityNo cancel feeOn-time63%

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.