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$463+ Cheap flights from Missouri 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 11/15. Fares are subject to change and may not be available on all flights or dates of travel.
STL — OPO
Aug 25 — Sep 11
Mon 8/25
Mon 9/1
1 adult, Economy
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Cheap flight deals from Missouri to Porto

Keep the following information in mind while searching for Missouri to Porto flight deals. Data was last updated August 20, 2025.

Round-trip from

$590
(United Airlines)

One-way from

$463
(United Airlines)

Popular in

July

Cheapest in

January

Average price

$1,037
From Missouri to Porto
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One-way flight from Missouri to Porto
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Highest demand for flights based on searches. 21% potential increase in price ($239 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($36 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Missouri to Porto

Cheapest flights from Missouri to Porto
Explore the most affordable flight options available from Missouri to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 20, 2025.

This United Airlines deal was found by Cheapflights users on 8/19. 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 11/185:00 pmMCI - OPO
1 stop10h 30mUnited Airlines
Tue 11/256:00 amOPO - MCI
2 stops21h 50mUnited Airlines
Deal found 8/19$590
This United Airlines deal was found by Cheapflights users on 8/19. 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 11/199:58 amMCI - OPO
2 stops17h 32mUnited Airlines
Wed 11/266:00 amOPO - MCI
2 stops32h 56mUnited Airlines
Deal found 8/19$594
This United Airlines deal was found by Cheapflights users on 8/19. 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 11/1811:37 amMCI - OPO
2 stops15h 53mUnited Airlines
Thu 11/276:00 amOPO - MCI
2 stops38h 21mUnited Airlines
Deal found 8/19$595
This United Airlines deal was found by Cheapflights users on 8/19. 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 11/1711:37 amMCI - OPO
2 stops15h 53mUnited Airlines
Thu 11/2712:30 pmOPO - MCI
2 stops31h 51mUnited Airlines
Deal found 8/19$600
This United Airlines deal was found by Cheapflights users on 8/19. 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 11/165:30 pmMCI - OPO
2 stops34h 00mUnited Airlines
Tue 11/256:00 amOPO - MCI
2 stops21h 50mUnited Airlines
Deal found 8/19$606
This United Airlines deal was found by Cheapflights users on 8/18. 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 11/195:00 pmMCI - OPO
1 stop10h 30mUnited Airlines
Wed 12/36:00 amOPO - MCI
2 stops41h 25mUnited Airlines
Deal found 8/18$609
This Delta deal was found by Cheapflights users on 8/19. 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 11/196:05 amMCI - OPO
2 stops22h 25mDelta
Tue 11/2511:10 amOPO - MCI
2 stops17h 11mDelta
Deal found 8/19$637
This Iberia deal was found by Cheapflights users on 8/19. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/151:45 pmMCI - OPO
2 stops35h 55mIberia
Mon 11/2412:25 pmOPO - MCI
2 stops38h 48mIberia
Deal found 8/19$640
This United Airlines deal was found by Cheapflights users on 8/19. 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 11/185:00 pmMCI - OPO
1 stop10h 30mUnited Airlines
Mon 11/2412:35 pmOPO - MCI
1 stop14h 35mUnited Airlines
Deal found 8/19$643
This Delta deal was found by Cheapflights users on 8/19. 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 11/196:05 amMCI - OPO
2 stops22h 25mDelta
Mon 11/2411:25 amOPO - MCI
2 stops34h 18mDelta
Deal found 8/19$650
This United Airlines deal was found by Cheapflights users on 8/19. 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 12/31:00 pmSTL - OPO
2 stops16h 40mUnited Airlines
Sun 12/76:00 amOPO - STL
1 stop13h 55mUnited Airlines
Deal found 8/19$656
This Iberia deal was found by Cheapflights users on 8/18. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:54 pmSTL - OPO
2 stops16h 51mIberia
Sun 12/712:25 pmOPO - STL
2 stops26h 18mIberia
Deal found 8/18$658

Cheapflights Fare Finder

 
Customize your flight search to find flights from Missouri 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 August 20, 2025.
Use the filters below to find and compare flights from Missouri to Porto that are best for you.

Fly from

Missouri

Fly to

Porto

Route

Depart

Return

Price

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Tue 11/18

11:37 am-9:30 am

2 stops15h 53m

Porto

Wed 11/26

12:30 pm-8:56 am

2 stops26h 26m

$590

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Mon 11/17

5:00 pm-9:30 am

1 stop10h 30m

Porto

Tue 11/25

6:00 am-9:50 pm

2 stops21h 50m

$590

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Wed 11/19

5:00 pm-9:30 am

1 stop10h 30m

Porto

Wed 12/3

6:00 am-8:47 pm

2 stops20h 47m

$590

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Tue 11/18

5:00 pm-9:30 am

1 stop10h 30m

Porto

Tue 11/25

6:00 am-9:50 pm

2 stops21h 50m

$590

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Wed 11/19

5:00 pm-9:30 am

1 stop10h 30m

Porto

Wed 11/26

6:00 am-8:56 am

2 stops32h 56m

$590

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Mon 11/17

5:00 pm-9:30 am

1 stop10h 30m

Porto

Wed 11/26

6:00 am-8:56 am

2 stops32h 56m

$590

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 12/3

1:00 pm-11:40 am

2 stops16h 40m

Porto

Sun 12/7

6:00 am-1:55 pm

1 stop13h 55m

$656

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 12/3

9:25 am-11:45 am

2 stops20h 20m

Porto

Sun 12/7

12:25 pm-8:43 am

2 stops26h 18m

$658

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 9/30

5:24 pm-9:45 am

1 stop10h 21m

Porto

Wed 10/15

6:00 am-3:44 pm

2 stops15h 44m

$750

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 12/3

3:50 pm-3:25 pm

1 stop17h 35m

Porto

Sun 12/7

6:00 am-1:55 pm

1 stop13h 55m

$778

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

Showing 1-10 of 16 results
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Best time to book a flight from Missouri to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Missouri 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 Missouri to Porto

What is the cheapest month to book a flight from Missouri to Porto?

Currently, January is the cheapest month in which you can book a flight from Missouri to Porto (average of $523). Flying from Missouri to Porto in June is currently the most expensive (average of $1,030). 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.

What is the cheapest time of day to fly from MO to OPO?

Find hourly flight availability from Missouri to Porto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 20, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Missouri to Porto as you normally would.

How much does it cost to fly round-trip from Missouri to Porto?

Related info for your journey

Find useful and relevant information for your journey from Missouri to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Porto from Missouri?

    Located just 6.8 mi from the city center, Porto (OPO) is the airport most travelers will use when flying to Porto from Missouri.

  • How long is the flight from Missouri to Porto?

    Departing from Missouri to Porto will take you 15h 53m. The distance from Missouri to Porto is about 4333 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 Missouri to Porto that include hotel bookings?

    Yes. In addition to deals on Missouri to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Missouri to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Missouri to Porto.

  • Can I find deals for business class flights from Missouri to Porto?

    Yes. Cheapflights offers flight deals from Missouri 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 Missouri to Porto?

    Currently, January is the cheapest month in which you can book a flight from Missouri to Porto (average of $523). Flying from Missouri to Porto in June is currently the most expensive (average of $1,030). 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
Aveiro
Arcos de Valdevez
Coimbra

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Top 3 airlines flying from Missouri to Porto

Discover the top 3 airlines that operate flights from Missouri to Porto. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$564Average$1,128FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$601Average$1,250FlexibilityNo cancel feeOn-time76%
DeltaCheapest$713Average$963FlexibilityNo cancel feeOn-timeN/A

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