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$492+ Cheap flights from Milwaukee (MKE) to Porto (OPO)

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 1/17. Fares are subject to change and may not be available on all flights or dates of travel.
MKE — OPO
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
1 adult, Economy
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Cheap flight deals from Milwaukee to Porto

Best flights from Milwaukee to Porto
Discover carefully curated flight deals from Milwaukee to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 4, 2025.

This KLM deal was found by Cheapflights users on 12/3. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/179:28 amMKE - OPO
2 stops19h 02mKLM
Sat 1/245:00 amOPO - MKE
2 stops20h 58mKLM
Deal found 12/3$492
This United Airlines deal was found by Cheapflights users on 12/2. 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 1/306:00 amMKE - OPO
2 stops23h 40mUnited Airlines
Tue 2/36:00 amOPO - MKE
2 stops18h 53mUnited Airlines
Deal found 12/2$503
This American Airlines deal was found by Cheapflights users on 12/4. 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 5/156:53 pmMKE - OPO
2 stops19h 07mAmerican Airlines
Tue 5/268:20 amOPO - MKE
2 stops21h 07mAmerican Airlines
Deal found 12/4$1,354
This TAP AIR PORTUGAL deal was found by Cheapflights users on 12/3. 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 TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/175:39 pmMKE - OPO
1 stop13h 31mMultiple Airlines
Sat 1/246:35 pmOPO - MKE
1 stop22h 11mMultiple Airlines
Deal found 12/3$1,395
This Gurufare deal was found by Cheapflights users on 12/4. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/1512:14 pmMKE - OPO
2 stops16h 06mLufthansa
Tue 5/269:00 amOPO - MKE
1 stop20h 27mLufthansa
Deal found 12/4$1,435

Find flight deals from Milwaukee to Porto

Discover tips and strategies to find the most affordable flight options for your journey from Milwaukee (MKE) to Porto (OPO). 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 4, 2025.

Round-trip from

$476
(Expedia)
From Milwaukee-Mitchell to Porto
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Milwaukee to Porto 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 4, 2025.
Use the filters below to find and compare flights from Milwaukee to Porto that are best for you.

Fly from

Milwaukee

Fly to

Porto

Route

Depart

Return

Price

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Sat 1/17

9:28 am-10:30 am

2 stops19h 02m

Porto

Sat 1/24

5:00 am-7:58 pm

2 stops20h 58m

$492

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Fri 1/30

6:00 am-11:40 am

2 stops23h 40m

Porto

Tue 2/3

6:00 am-6:53 pm

2 stops18h 53m

$503

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Fri 5/15

6:53 pm-8:00 pm

2 stops19h 07m

Porto

Tue 5/26

8:20 am-11:27 pm

2 stops21h 07m

$1,354

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Sat 1/17

5:39 pm-1:10 pm

1 stop13h 31m

Porto

Sat 1/24

6:35 pm-10:46 am

1 stop22h 11m

$1,395

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Fri 5/15

12:14 pm-10:20 am

2 stops16h 06m

Porto

Tue 5/26

9:00 am-11:27 pm

1 stop20h 27m

$1,435

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

Best time to book a flight from Milwaukee to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto 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 Porto

What is the cheapest month to book a flight from Milwaukee to Porto?

Currently, November is the cheapest month in which you can book a flight from Milwaukee to Porto (average of $449). Flying from Milwaukee to Porto in June is currently the most expensive (average of $695). 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.

Related info for your journey

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

  • How long is the flight from Milwaukee to Porto?

    KLM, United Airlines, and American Airlines can get you from Milwaukee to Porto in just under 19h 02m. Your travel time can differ by up to 4h 38m. The distance from Milwaukee to Porto is about 3900 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • Can I find deals for flights from Milwaukee to Porto that include hotel bookings?

    Yes. In addition to deals on Milwaukee to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Milwaukee to Porto?

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

  • Can I find deals for business class flights from Milwaukee to Porto?

    Yes. Cheapflights offers flight deals from Milwaukee to Porto 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 Porto?

    Currently, November is the cheapest month in which you can book a flight from Milwaukee to Porto (average of $449). Flying from Milwaukee to Porto in June is currently the most expensive (average of $695). 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 Porto?

Book flights to Porto if you plan to visit one of these locations
Aveiro
Arcos de Valdevez
Coimbra
Vila Nova de Gaia

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