$69 Cheap Flights from Milwaukee (MKE) to San Juan (SJU)

View $69 flight on Sun, Jan 18, 2026Opens in a new window

Popular airlines from General Mitchell Intl. Airport (MKE) to Luis Munoz Marin Intl. Airport (SJU)

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Cheap Flights from Milwaukee to San Juan (MKE-SJU)

Prices were available within the past 7 days and start at $69 for one-way flights and $138 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sun, Jan 25 - Wed, Jan 28
MKE
Milwaukee
SJU
San Juan
$138 Roundtrip, found 21 hours ago
$138
Roundtrip
found 21 hours ago
Select Frontier Airlines flight, departing Sun, Jan 25 from Milwaukee to San Juan, returning Wed, Jan 28, priced at $138 found 21 hours ago
Frontier Airlines
Tue, Jan 27 - Wed, Feb 4
MKE
Milwaukee
SJU
San Juan
$148 Roundtrip, found 1 day ago
$148
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, Jan 27 from Milwaukee to San Juan, returning Wed, Feb 4, priced at $148 found 1 day ago
Frontier Airlines
Tue, Jan 27 - Wed, Feb 4
MKE
Milwaukee
SJU
San Juan
$163 Roundtrip, found 1 day ago
$163
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, Jan 27 from Milwaukee to San Juan, returning Wed, Feb 4, priced at $163 found 1 day ago
Frontier Airlines
Sun, Jan 25 - Wed, Jan 28
MKE
Milwaukee
SJU
San Juan
$176 Roundtrip, found 21 hours ago
$176
Roundtrip
found 21 hours ago
Select Frontier Airlines flight, departing Sun, Jan 25 from Milwaukee to San Juan, returning Wed, Jan 28, priced at $176 found 21 hours ago
Frontier Airlines
Mon, Jan 26 - Tue, Feb 3
MKE
Milwaukee
SJU
San Juan
$178 Roundtrip, found 1 day ago
$178
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Mon, Jan 26 from Milwaukee to San Juan, returning Tue, Feb 3, priced at $178 found 1 day ago
American Airlines
Mon, Jan 12 - Wed, Jan 21
MKE
Milwaukee
SJU
San Juan
$187 Roundtrip, found 7 hours ago
$187
Roundtrip
found 7 hours ago
Select American Airlines flight, departing Mon, Jan 12 from Milwaukee to San Juan, returning Wed, Jan 21, priced at $187 found 7 hours ago
Frontier Airlines
Sun, Jan 25 - Wed, Jan 28
MKE
Milwaukee
SJU
San Juan
$193 Roundtrip, found 21 hours ago
$193
Roundtrip
found 21 hours ago
Select Frontier Airlines flight, departing Sun, Jan 25 from Milwaukee to San Juan, returning Wed, Jan 28, priced at $193 found 21 hours ago
Southwest Airlines
Tue, Feb 17 - Thu, Feb 26
MKE
Milwaukee
SJU
San Juan
$203 Roundtrip, found 1 hour ago
$203
Roundtrip
found 1 hour ago
Select Southwest Airlines flight, departing Tue, Feb 17 from Milwaukee to San Juan, returning Thu, Feb 26, priced at $203 found 1 hour ago
United
Sun, Jan 25 - Wed, Jan 28
MKE
Milwaukee
SJU
San Juan
$210 Roundtrip, found 21 hours ago
$210
Roundtrip
found 21 hours ago
Select United flight, departing Sun, Jan 25 from Milwaukee to San Juan, returning Wed, Jan 28, priced at $210 found 21 hours ago
Delta
Tue, May 5 - Wed, May 6
MKE
Milwaukee
SJU
San Juan
$230 Roundtrip, found 16 hours ago
$230
Roundtrip
found 16 hours ago
Select Delta flight, departing Tue, May 5 from Milwaukee to San Juan, returning Wed, May 6, priced at $230 found 16 hours ago

Find the cheapest month to fly from Milwaukee (MKE) to San Juan (SJU)

January is typically the cheapest month to fly

From $168 - $473 per traveler.

Alternative airports near San Juan

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Luis Munoz Marin Intl. SJU. Cheapest option available. Average driving time to city center is 16 minutes. Flights from $387
SJU
Luis Munoz Marin Intl.
Cheapest
Average driving time to city center16 min
Flights from $387
Flights from Milwaukee (MKE) to San Juan (SJU)
Origin airport
General Mitchell Intl.
Destination airport
Luis Munoz Marin Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, JetBlue Airways, Southwest Airlines, Spirit Airlines, Sun Country Airlines, United
Roundtrip price
$138
Distance
2121 mi

Milwaukee to San Juan Flights

The cheapest times to fly from Milwaukee to San Juan

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Milwaukee to San Juan are during the month of January. You can find some of the cheapest flights from Milwaukee to San Juan with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Milwaukee to San Juan

Sunday is one of the best days to book for cheap flights from Milwaukee to San Juan: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Milwaukee to San Juan

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Milwaukee to San Juan in 2025. You can also book with separate airlines for your outbound and return journeys, from $69 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Milwaukee to San Juan flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Milwaukee to San Juan airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from General Mitchell Intl. Airport (MKE) to Luis Munoz Marin Intl. Airport (SJU) cost?
Secure a cheap one-way flight from $69 or cheap return flight from $138 from General Mitchell Intl. Airport (MKE) to Luis Munoz Marin Intl. Airport (SJU) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from General Mitchell Intl. Airport (MKE) to Luis Munoz Marin Intl. Airport (SJU)?
January is the most affordable month to fly from MKE to SJU. Planning your trip for the off-season is often the key to finding a great deal.
What is the cheapest airline that flies from General Mitchell Intl. Airport (MKE) to Luis Munoz Marin Intl. Airport (SJU)?
Expedia's filter tool lets you easily compare different airlines, travel time and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest MKE to SJU flight.
How many flights per day from General Mitchell Intl. Airport (MKE) to Luis Munoz Marin Intl. Airport (SJU)?
Nonstop flights from General Mitchell Intl. Airport (MKE) to Luis Munoz Marin Intl. Airport (SJU) aren't available daily, so you'll have to take a flight with a layover. Explore your options with our filter tool. Enter your dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from MKE to SJU?
Typically you'll find the widest variety of flight choices on a Friday. Tuesdays are often the quietest.* However, this can change depending on the airline, time of year and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from General Mitchell Intl. Airport (MKE) to Luis Munoz Marin Intl. Airport (SJU)?
Book a flight from General Mitchell Intl. Airport (MKE) to Luis Munoz Marin Intl. Airport (SJU) that leaves before 3 PM to reduce the risk of delays and cancellations. Departures after this time are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from General Mitchell Intl. Airport (MKE) to Luis Munoz Marin Intl. Airport (SJU) last-minute?
Waiting until just before your departure to book a flight from MKE to SJU often results in higher prices. While you may come across some last-minute discounts, they're not always guaranteed. Be flexible with your itinerary for the best chance of landing a bargain.
Can I cancel or change the date of my flight from General Mitchell Intl. Airport (MKE) to Luis Munoz Marin Intl. Airport (SJU)?
In most cases, you can reschedule or cancel your MKE to SJU flight. However, there may be additional charges, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's fees and rules on flight changes, or if you'd like more details, head to our Customer Service portal.

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*Available to One Key members.