$747+ 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 12/23. Fares are subject to change and may not be available on all flights or dates of travel.
MKE — OPO
Oct 10 — Oct 171
Round-trip
1 adult, Economy
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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
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Cheapest flights from Milwaukee to PortoExplore 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 September 10, 2026.
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 September 10, 2026.
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Wed 12/238:20 am -
2 stops43h 10m
Tue 12/296:00 am -
2 stops23h 11m
Deal found 9/9![United Airlines logo]()
$747
This KAYAK deal was found by Cheapflights users on 9/9. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/247:00 pm -
2 stops22h 55m
Tue 12/295:15 am -
2 stops41h 31m
Deal found 9/9![Lufthansa logo]()
$756
This KAYAK deal was found by Cheapflights users on 9/9. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/247:00 pm -
2 stops22h 55m
Mon 12/281:45 pm -
2 stops57h 01m
Deal found 9/9![Lufthansa logo]()
$766
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Wed 12/237:45 am -
2 stops43h 45m
Mon 12/2812:30 pm -
2 stops31h 26m
Deal found 9/9![United Airlines logo]()
$768
This KAYAK deal was found by Cheapflights users on 9/9. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/247:00 pm -
2 stops22h 55m
Sun 12/276:00 am -
2 stops16h 46m
Deal found 9/9![Lufthansa logo]()
$776
This KAYAK deal was found by Cheapflights users on 9/9. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/252:31 pm -
2 stops25h 54m
Mon 12/281:45 pm -
2 stops57h 01m
Deal found 9/9![Lufthansa logo]()
$778
This Delta deal was found by Cheapflights users on 9/7. 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.
Thu 10/228:00 am -
1 stop20h 30m
Thu 10/295:00 am -
2 stops20h 57m
Deal found 9/7![Delta logo]()
$853
This Delta deal was found by Cheapflights users on 9/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/241:25 pm -
2 stops20h 00m
Mon 12/2810:15 am -
1 stop18h 21m
Deal found 9/9![Delta logo]()
$901
This Delta deal was found by Cheapflights users on 9/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2211:15 am -
2 stops17h 20m
Fri 12/255:55 am -
2 stops16h 45m
Deal found 9/9![Delta logo]()
$921
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Thu 12/246:29 am -
1 stop21h 01m
Sun 12/276:00 am -
2 stops18h 56m
Deal found 9/9![United Airlines logo]()
$942
Best flights from Milwaukee to PortoDiscover 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 September 10, 2026.
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 September 10, 2026.
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Mon 11/1611:07 am -
1 stop16h 23m
Fri 11/206:00 am -
2 stops18h 58m
Deal found 9/9![United Airlines logo]()
$1,080
Last-minute flights from Milwaukee to PortoDiscover last-minute flight deals from Milwaukee to Porto. Data last updated September 10, 2026 and is based on user searches.
Discover last-minute flight deals from Milwaukee to Porto. Data last updated September 10, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 9/10. 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.
Mon 9/142:55 pm -
2 stops18h 30m
Wed 9/305:00 am -
2 stops17h 05m
Deal found 9/10![Delta logo]()
$1,132
This Delta deal was found by Cheapflights users on 9/10. 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.
Mon 9/141:28 pm -
2 stops19h 57m
Mon 9/284:25 pm -
2 stops31h 42m
Deal found 9/10![Delta logo]()
$1,152
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1411:45 am -
1 stop16h 00m
Wed 9/306:00 am -
2 stops23h 37m
Deal found 9/10![United Airlines logo]()
$1,155
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1411:45 am -
1 stop13h 10m
Mon 9/286:00 am -
2 stops34h 48m
Deal found 9/10![United Airlines logo]()
$1,288
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1411:45 am -
1 stop13h 10m
Sat 9/266:00 am -
2 stops22h 59m
Deal found 9/10![United Airlines logo]()
$1,360
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/155:00 am -
2 stops20h 00m
Sat 9/266:00 am -
2 stops22h 59m
Deal found 9/10![United Airlines logo]()
$1,364
This KAYAK deal was found by Cheapflights users on 9/10. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/187:05 pm -
1 stop29h 50m
Sun 9/276:00 am -
2 stops23h 37m
Deal found 9/10![Lufthansa logo]()
$1,087
This United deal was found by Cheapflights users on 9/10. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1810:30 am -
2 stops17h 15m
Sun 9/2711:15 am -
2 stops28h 52m
Deal found 9/10![Multiple Airlines logo]()
$1,216
This Delta deal was found by Cheapflights users on 9/7. 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.
Thu 10/228:00 am -
1 stop20h 30m
Thu 10/295:00 am -
2 stops20h 57m
Deal found 9/7![Delta logo]()
$853
This Ovago deal was found by Cheapflights users on 9/7. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2211:36 am -
1 stop16h 09m
Thu 10/2912:35 pm -
1 stop15h 29m
Deal found 9/7![Lufthansa logo]()
$1,368
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 September 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $747 (United Airlines) |
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 7,457,451 searches. Data last updated September 10, 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
Cheapest round-trip
Quickest round-trip
MilwaukeePorto
MKE Milwaukee-Mitchell - OPO Porto
MKEOPO
Milwaukee-Mitchell
Mon 11/16
11:07 am-9:30 am
1 stop16h 23m
Porto
Fri 11/20
6:00 am-6:58 pm
2 stops18h 58m
$1,080
Sorted by cheapest first
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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.
MKE-OPO
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.
Traveling to a place near Porto?
Book flights to Porto if you plan to visit one of these locationsVila Nova de Gaia
Arcos de Valdevez
Coimbra
Aveiro
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