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$715+ 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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
MKE — OPO
Apr 14 — Apr 211
Tue 4/14
Tue 4/21
1 adult, Economy
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Cheap flight deals from Milwaukee to Porto

Cheapest flights from Milwaukee to Porto
Explore the most affordable flight options available from Milwaukee to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 15, 2026.

This United Airlines deal was found by Cheapflights users on 3/12. 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 12/410:45 am
MKE
-
OPO
2 stops18h 55m
United Airlines
Tue 12/86:00 am
OPO
-
MKE
2 stops23h 27m
United Airlines
Deal found 3/12$715
This Delta deal was found by Cheapflights users on 3/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/35:48 pm
MKE
-
OPO
2 stops18h 22m
Delta
Tue 5/195:00 am
OPO
-
MKE
2 stops19h 03m
Delta
Deal found 3/12$737
This Delta deal was found by Cheapflights users on 3/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/35:48 pm
MKE
-
OPO
2 stops18h 22m
Delta
Wed 5/205:55 am
OPO
-
MKE
2 stops23h 00m
Delta
Deal found 3/12$744
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Tue 8/1112:07 pm
MKE
-
OPO
1 stop12h 48m
United Airlines
Wed 8/192:25 pm
OPO
-
MKE
2 stops15h 46m
United Airlines
Deal found 3/13$752
This BusinessClass deal was found by Cheapflights users on 3/11. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1010:38 am
MKE
-
OPO
2 stops14h 22m
Lufthansa
Wed 8/1912:35 pm
OPO
-
MKE
1 stop17h 01m
Lufthansa
Deal found 3/11$754
This Delta deal was found by Cheapflights users on 3/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/39:35 am
MKE
-
OPO
2 stops26h 35m
Delta
Thu 5/214:25 pm
OPO
-
MKE
2 stops34h 03m
Delta
Deal found 3/12$757
This American Airlines deal was found by Cheapflights users on 3/10. 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 5/56:39 am
MKE
-
OPO
2 stops19h 01m
American Airlines
Thu 5/148:20 am
OPO
-
MKE
2 stops15h 40m
American Airlines
Deal found 3/10$765
This Delta deal was found by Cheapflights users on 3/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/97:00 am
MKE
-
OPO
1 stop21h 25m
Delta
Fri 8/215:00 am
OPO
-
MKE
2 stops17h 42m
Delta
Deal found 3/10$777
This Delta deal was found by Cheapflights users on 3/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/102:45 pm
MKE
-
OPO
2 stops18h 40m
Delta
Fri 8/215:00 am
OPO
-
MKE
2 stops17h 42m
Delta
Deal found 3/11$781

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 March 15, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$737
(Delta)
Provider with most accurate pricing for Milwaukee-Mitchell-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Milwaukee-Mitchell-Porto flights.
Search Deals
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 March 15, 2026.
Use the filters below to find and compare flights from Milwaukee to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Mon 8/10

7:30 am-6:55 am

2 stops17h 25m

Porto

Wed 8/19

12:35 pm-12:11 am

2 stops17h 36m

$753

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Sun 8/9

12:05 pm-6:55 am

2 stops12h 50m

Porto

Wed 8/19

12:35 pm-12:11 am

2 stops17h 36m

$753
Quickest round-trip

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Wed 8/12

12:07 pm-6:55 am

1 stop12h 48m

Porto

Wed 8/19

12:35 pm-12:11 am

2 stops17h 36m

$753

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Mon 8/10

8:30 am-6:55 am

2 stops16h 25m

Porto

Thu 8/20

9:00 am-8:55 pm

2 stops17h 55m

$753

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Wed 8/12

7:00 am-10:30 am

1 stop21h 30m

Porto

Fri 8/21

5:00 am-4:42 pm

2 stops17h 42m

$777

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Mon 8/10

2:45 pm-3:25 pm

2 stops18h 40m

Porto

Fri 8/21

5:00 am-4:42 pm

2 stops17h 42m

$781

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Tue 8/11

1:00 pm-10:30 am

2 stops15h 30m

Porto

Fri 8/21

5:00 am-4:42 pm

2 stops17h 42m

$782

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Sun 8/9

9:20 am-10:25 am

2 stops19h 05m

Porto

Fri 8/21

5:00 am-4:42 pm

2 stops17h 42m

$782

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/14

Sorted by cheapest first
  • Most accurate provider: When it comes to deals on Milwaukee-Porto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Milwaukee-Porto flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Milwaukee-Porto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Milwaukee-Porto flights, Cheapflights users trust FlightHub the most. FlightHub 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-Porto 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 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, April is the cheapest month in which you can book a flight from Milwaukee to Porto (average of $421). Flying from Milwaukee to Porto in June is currently the most expensive (average of $680). 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?

    United Airlines can get you from Milwaukee to Porto in just under 17h 25m. Your travel time can differ by up to . The distance from Milwaukee to Porto is about 3900 mi.

  • 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, April is the cheapest month in which you can book a flight from Milwaukee to Porto (average of $421). Flying from Milwaukee to Porto in June is currently the most expensive (average of $680). 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
Vila Nova de Gaia
Aveiro
Arcos de Valdevez
Coimbra

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