HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Porto

$315+ 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 9/21. Fares are subject to change and may not be available on all flights or dates of travel.
MKE — OPO
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Milwaukee to Porto 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.

Cheap 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 3, 2025.

Round-trip from

$727
(Billigflug)

One-way from

$315
(Kiwi.com)
From Milwaukee-Mitchell to Porto
Search Deals
One-way flight from Milwaukee-Mitchell to Porto
Search Deals

Find 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 3, 2025.

This Billigflug deal was found by Cheapflights users on 7/2. 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 Billigflug is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/115:15 amMKE - OPO
2 stops22h 20mAir Canada
Wed 8/2012:35 pmOPO - MKE
2 stops15h 21mAir Canada
Deal found 7/2$727
This Billigflug deal was found by Cheapflights users on 7/2. 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 Billigflug is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1110:45 amMKE - OPO
2 stops17h 00mMultiple Airlines
Wed 8/2012:35 pmOPO - MKE
1 stop16h 54mMultiple Airlines
Deal found 7/2$729
This United Airlines deal was found by Cheapflights users on 7/3. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/176:00 amMKE - OPO
2 stops21h 20mUnited Airlines
Tue 9/2312:50 pmOPO - MKE
2 stops39h 06mUnited Airlines
Deal found 7/3$730
This American Airlines deal was found by Cheapflights users on 7/1. 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.
Wed 8/131:06 pmMKE - OPO
2 stops16h 34mAmerican Airlines
Thu 8/288:15 amOPO - MKE
2 stops19h 04mAmerican Airlines
Deal found 7/1$768
This Delta deal was found by Cheapflights users on 7/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/307:15 amMKE - OPO
2 stops19h 10mDelta
Thu 8/219:20 amOPO - MKE
2 stops17h 26mDelta
Deal found 7/2$787
This Lufthansa deal was found by Cheapflights users on 7/2. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/411:48 amMKE - OPO
2 stops29h 32mLufthansa
Mon 8/2512:10 pmOPO - MKE
2 stops38h 36mLufthansa
Deal found 7/2$888

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 3, 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

Mon 8/11

5:15 am-9:35 am

2 stops22h 20m

Porto

Wed 8/20

12:35 pm-9:56 pm

2 stops15h 21m

$727

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Mon 8/11

10:45 am-9:45 am

2 stops17h 00m

Porto

Wed 8/20

12:35 pm-11:29 pm

1 stop16h 54m

$729

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Wed 9/17

6:00 am-9:20 am

2 stops21h 20m

Porto

Tue 9/23

12:50 pm-9:56 pm

2 stops39h 06m

$730

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Wed 8/13

1:06 pm-11:40 am

2 stops16h 34m

Porto

Thu 8/28

8:15 am-9:19 pm

2 stops19h 04m

$768

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Wed 7/30

7:15 am-8:25 am

2 stops19h 10m

Porto

Thu 8/21

9:20 am-8:46 pm

2 stops17h 26m

$787

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Mon 8/4

11:48 am-11:20 pm

2 stops29h 32m

Porto

Mon 8/25

12:10 pm-8:46 pm

2 stops38h 36m

$888

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Sun 9/21

12:53 pm-9:15 am

2 stops38h 22m

$315

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Mon 9/22

12:05 pm-9:35 am

2 stops15h 30m

$583

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Fri 9/19

10:50 am-9:45 am

2 stops16h 55m

$643

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

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, January is the cheapest month in which you can book a flight from Milwaukee to Porto (average of $523). Flying from Milwaukee to Porto in June is currently the most expensive (average of $1,033). 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.

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. 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 Porto. Reviews last updated July 3, 2025.
See what other customers who have flown with Delta, United Airlines, and American Airlines from Milwaukee to Porto have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,982 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,861 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air Canada
7.1
Good
9,681 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Lufthansa
6.8
Okay
7,207 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

  • 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, January is the cheapest month in which you can book a flight from Milwaukee to Porto (average of $523). Flying from Milwaukee to Porto in June is currently the most expensive (average of $1,033). 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 Milwaukee?

Book flights to Milwaukee if you plan to visit one of these locations
Aveiro
Coimbra
Matosinhos

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.

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.