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$469+ 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 8/22. Fares are subject to change and may not be available on all flights or dates of travel.
MKE — OPO
Jul 14 — Jul 211
Tue 7/14
Tue 7/21
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 June 14, 2026.

This United Airlines deal was found by Cheapflights users on 6/13. 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.
Sun 12/63:00 pm
MKE
-
OPO
1 stop12h 30m
United Airlines
Thu 12/106:00 am
OPO
-
MKE
2 stops24h 09m
United Airlines
Deal found 6/13$745
This United Airlines deal was found by Cheapflights users on 6/14. 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 7/2110:53 am
MKE
-
OPO
1 stop16h 52m
United Airlines
Tue 7/2812:15 pm
OPO
-
MKE
2 stops37h 11m
United Airlines
Deal found 6/14$926
This United Airlines deal was found by Cheapflights users on 6/13. 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 7/286:14 am
MKE
-
OPO
1 stop18h 01m
United Airlines
Tue 8/412:15 pm
OPO
-
MKE
2 stops32h 21m
United Airlines
Deal found 6/13$955
This Travelocity deal was found by Cheapflights users on 6/12. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/111:44 pm
MKE
-
OPO
2 stops16h 01m
Iberia
Fri 7/178:40 pm
OPO
-
MKE
2 stops27h 44m
Iberia
Deal found 6/12$1,091
This United deal was found by Cheapflights users on 6/12. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/116:14 am
MKE
-
OPO
1 stop18h 41m
Multiple Airlines
Fri 7/176:20 am
OPO
-
MKE
2 stops46h 09m
Multiple Airlines
Deal found 6/12$1,146
This United Airlines deal was found by Cheapflights users on 6/9. 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 7/246:20 am
MKE
-
OPO
2 stops18h 40m
United Airlines
Fri 7/3112:05 pm
OPO
-
MKE
2 stops16h 24m
United Airlines
Deal found 6/9$1,159

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 June 14, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$745
(United Airlines)

One-way from

$469
(United Airlines)
Provider with most accurate pricing for Milwaukee-Mitchell-Porto flight deals.
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Provider most trusted by Cheapflights users for Milwaukee-Mitchell-Porto flights.
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From Milwaukee-Mitchell to Porto
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One-way flight from Milwaukee-Mitchell to Porto
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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 June 14, 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

Sun 12/6

2:50 pm-9:30 am

2 stops12h 40m

Porto

Thu 12/10

6:00 am-11:27 pm

2 stops23h 27m

$750

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Sat 7/11

6:14 am-6:55 am

1 stop18h 41m

Porto

Fri 7/17

6:20 am-10:29 pm

2 stops46h 09m

$1,146

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Fri 7/24

6:20 am-7:00 am

2 stops18h 40m

Porto

Fri 7/31

12:05 pm-10:29 pm

2 stops16h 24m

$1,159
Quickest round-trip

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Wed 7/8

10:53 am-6:55 am

1 stop14h 02m

Porto

Tue 7/14

12:05 pm-10:29 pm

2 stops16h 24m

$1,544

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Wed 7/8

6:20 am-7:00 am

2 stops18h 40m

Porto

Tue 7/14

12:15 pm-10:29 pm

3 stops16h 14m

$1,557

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Wed 7/8

8:50 am-7:00 am

3 stops16h 10m

Porto

Tue 7/14

12:15 pm-10:29 pm

3 stops16h 14m

$1,565

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Mon 6/29

6:50 pm-8:00 pm

2 stops19h 10m

Porto

Tue 7/14

8:20 am-9:01 pm

2 stops18h 41m

$2,473
Cheapest one-way

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Sat 8/22

5:17 pm-6:55 am

2 stops31h 38m

$469

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Sat 9/12

6:47 pm-7:00 am

2 stops54h 13m

$478

MilwaukeePorto

MKE - OPO

MKEOPO

Milwaukee-Mitchell

Sat 8/22

4:56 pm-7:50 am

3 stops32h 54m

$516

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 15 resultsSorted by cheapest first
1
2
  • 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?

    United Airlines can get you from Milwaukee to Porto in just under 12h 40m. 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.

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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