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$434+ Cheap flights from Milwaukee (MKE) to Porto (OPO)

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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
MKE — OPO
Aug 28 — Sep 41
Fri 8/28
Fri 9/4
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 July 29, 2026.

This Delta deal was found by Cheapflights users on 7/25. 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.
Wed 9/234:57 pm
MKE
-
OPO
2 stops16h 28m
Delta
Tue 10/135:00 am
OPO
-
MKE
2 stops19h 04m
Delta
Deal found 7/25$885
This United Airlines deal was found by Cheapflights users on 7/28. 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 8/256:00 am
MKE
-
OPO
1 stop18h 15m
United Airlines
Tue 9/112:15 pm
OPO
-
MKE
2 stops28h 19m
United Airlines
Deal found 7/28$931
This United Airlines deal was found by Cheapflights users on 7/28. 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 8/256:00 am
MKE
-
OPO
2 stops19h 00m
United Airlines
Wed 9/211:20 am
OPO
-
MKE
2 stops33h 13m
United Airlines
Deal found 7/28$934
This Delta deal was found by Cheapflights users on 7/28. 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.
Tue 8/253:59 pm
MKE
-
OPO
2 stops17h 26m
Delta
Wed 9/25:00 am
OPO
-
MKE
2 stops21h 18m
Delta
Deal found 7/28$935
This Delta deal was found by Cheapflights users on 7/28. 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.
Tue 8/251:18 pm
MKE
-
OPO
1 stop15h 12m
Delta
Thu 9/35:55 am
OPO
-
MKE
2 stops22h 35m
Delta
Deal found 7/28$938
This Delta deal was found by Cheapflights users on 7/28. 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.
Tue 8/251:18 pm
MKE
-
OPO
1 stop15h 12m
Delta
Fri 9/412:45 pm
OPO
-
MKE
1 stop12h 39m
Delta
Deal found 7/28$939
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Wed 8/2611:40 am
MKE
-
OPO
1 stop13h 15m
United Airlines
Thu 9/36:00 am
OPO
-
MKE
2 stops23h 37m
United Airlines
Deal found 7/28$942
This Delta deal was found by Cheapflights users on 7/28. 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.
Wed 8/264:47 pm
MKE
-
OPO
2 stops16h 38m
Delta
Wed 9/212:40 pm
OPO
-
MKE
1 stop12h 44m
Delta
Deal found 7/28$943
This Delta deal was found by Cheapflights users on 7/28. 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.
Tue 8/251:18 pm
MKE
-
OPO
1 stop15h 12m
Delta
Mon 8/315:00 am
OPO
-
MKE
2 stops17h 02m
Delta
Deal found 7/28$991
This Delta deal was found by Cheapflights users on 7/28. 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.
Tue 8/251:18 pm
MKE
-
OPO
1 stop15h 12m
Delta
Sat 9/512:55 pm
OPO
-
MKE
1 stop15h 07m
Delta
Deal found 7/28$999
This KAYAK deal was found by Cheapflights users on 7/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2611:40 am
MKE
-
OPO
1 stop13h 15m
Lufthansa
Wed 9/28:55 am
OPO
-
MKE
1 stop15h 27m
Lufthansa
Deal found 7/28$1,000
This Delta deal was found by Cheapflights users on 7/28. 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.
Wed 8/265:19 pm
MKE
-
OPO
2 stops16h 06m
Delta
Sat 9/512:55 pm
OPO
-
MKE
1 stop15h 07m
Delta
Deal found 7/28$1,003

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 July 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$885
(Delta)

One-way from

$434
(Kiwi.com)
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
One-way flight 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 July 29, 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

Tue 9/8

4:57 pm-3:25 pm

2 stops16h 28m

Porto

Tue 9/15

5:00 am-8:31 pm

2 stops21h 31m

$935

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Wed 8/26

5:19 pm-3:25 pm

2 stops16h 06m

Porto

Sat 9/5

12:55 pm-10:02 pm

1 stop15h 07m

$1,003
Quickest round-trip

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Fri 8/28

11:40 am-6:50 am

1 stop13h 10m

Porto

Tue 9/1

9:00 am-6:22 pm

1 stop15h 22m

$1,021

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Tue 9/15

2:48 pm-4:00 pm

2 stops19h 12m

Porto

Sat 9/19

8:40 pm-8:03 pm

2 stops29h 23m

$1,071

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Wed 9/23

6:05 am-9:45 am

1 stop21h 40m

Porto

Tue 10/13

12:05 pm-10:59 pm

2 stops16h 54m

$1,078

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Fri 8/28

11:40 am-6:50 am

1 stop13h 10m

Porto

Sat 9/5

9:00 am-6:22 pm

1 stop15h 22m

$1,081

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Mon 8/24

4:47 pm-3:25 pm

2 stops16h 38m

Porto

Wed 9/2

5:00 am-6:17 pm

2 stops19h 17m

$1,136

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Mon 8/24

11:40 am-9:45 am

1 stop16h 05m

Porto

Wed 9/2

11:20 am-10:00 am

2 stops28h 40m

$1,148

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Tue 9/15

11:45 am-6:15 am

1 stop12h 30m

Porto

Sat 9/19

8:40 pm-8:03 pm

2 stops29h 23m

$1,173

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Tue 9/8

11:45 am-6:15 am

1 stop12h 30m

Porto

Tue 9/15

12:35 pm-11:37 pm

1 stop17h 02m

$1,232

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 17 resultsSorted by cheapest first
1
2

Compare providers for flights from Milwaukee to Porto

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 Porto in July.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars

*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-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.

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?

    Delta and Iberia can get you from Milwaukee to Porto in just under 16h 28m. Your travel time can differ by up to 2h 44m. 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.

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
Arcos de Valdevez
Coimbra
Aveiro

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