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$516+ Cheap flights from Porto (OPO) to Missouri

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 8/26. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — STL
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
1 adult, Economy
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Cheap flight deals from Porto to Missouri

Keep the following information in mind while searching for Porto to Missouri flight deals. Data was last updated August 18, 2025.

Round-trip from

$800
(United Airlines)

One-way from

$516
(Kiwi.com)
From Porto to Missouri
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One-way flight from Porto to Missouri
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Find flight deals from Porto to Missouri

Cheapest flights from Porto to Missouri
Explore the most affordable flight options available from Porto to Missouri. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

This United Airlines deal was found by Cheapflights users on 8/16. 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 9/912:50 pmOPO - STL
2 stops36h 09mUnited Airlines
Tue 9/165:22 pmSTL - OPO
1 stop10h 23mUnited Airlines
Deal found 8/16$800
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 9/39:35 amOPO - STL
1 stop20h 09mUnited Airlines
Sun 9/75:22 pmSTL - OPO
1 stop31h 33mUnited Airlines
Deal found 8/18$817
This Lufthansa deal was found by Cheapflights users on 8/17. 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.
Thu 12/184:15 pmOPO - STL
1 stop27h 40mLufthansa
Tue 1/61:27 pmSTL - OPO
2 stops19h 18mLufthansa
Deal found 8/17$840
This Lufthansa deal was found by Cheapflights users on 8/17. 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.
Thu 12/1812:30 pmOPO - STL
1 stop31h 25mLufthansa
Sun 1/43:50 pmSTL - OPO
1 stop17h 25mLufthansa
Deal found 8/17$858
This United Airlines deal was found by Cheapflights users on 8/17. 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 12/196:00 amOPO - STL
2 stops17h 54mUnited Airlines
Mon 1/56:35 pmSTL - OPO
2 stops38h 10mUnited Airlines
Deal found 8/17$866
This Air Canada deal was found by Cheapflights users on 8/17. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/186:00 amOPO - STL
2 stops39h 29mAir Canada
Tue 1/64:05 pmSTL - OPO
2 stops37h 35mAir Canada
Deal found 8/17$871
This United Airlines deal was found by Cheapflights users on 8/17. 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 12/196:00 amOPO - STL
2 stops17h 54mUnited Airlines
Tue 1/64:05 pmSTL - OPO
2 stops37h 35mUnited Airlines
Deal found 8/17$873
This Delta deal was found by Cheapflights users on 8/17. 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 12/186:35 amOPO - STL
2 stops20h 00mDelta
Sun 1/46:29 amSTL - OPO
2 stops22h 01mDelta
Deal found 8/17$875
This Delta deal was found by Cheapflights users on 8/17. 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.
Sat 12/206:00 amOPO - STL
2 stops22h 01mDelta
Tue 1/66:45 amSTL - OPO
2 stops21h 45mDelta
Deal found 8/17$881
This United Airlines deal was found by Cheapflights users on 8/17. 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 12/196:00 amOPO - STL
2 stops17h 54mUnited Airlines
Sun 1/43:50 pmSTL - OPO
1 stop13h 50mUnited Airlines
Deal found 8/17$884

Cheapflights Fare Finder

 
Customize your flight search to find flights from Porto to Missouri 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 18, 2025.
Use the filters below to find and compare flights from Porto to Missouri that are best for you.

Fly from

Porto

Fly to

Missouri

Route

Depart

Return

Price

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Tue 9/9

12:50 pm-6:59 pm

2 stops36h 09m

Lambert-St Louis

Tue 9/16

5:22 pm-9:45 am

1 stop10h 23m

$800

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Wed 9/3

9:35 am-10:16 pm

2 stops18h 41m

Lambert-St Louis

Sun 9/7

8:15 am-6:55 am

2 stops16h 40m

$817

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Fri 2/6

4:15 pm-5:14 pm

2 stops30h 59m

Lambert-St Louis

Sun 2/8

1:27 pm-3:15 pm

2 stops19h 48m

$823

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Thu 12/18

4:15 pm-1:55 pm

1 stop27h 40m

Lambert-St Louis

Tue 1/6

1:27 pm-2:45 pm

2 stops19h 18m

$840

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Thu 12/18

12:30 pm-1:55 pm

1 stop31h 25m

Lambert-St Louis

Sun 1/4

3:50 pm-3:15 pm

1 stop17h 25m

$858

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Fri 12/19

6:00 am-5:54 pm

2 stops17h 54m

Lambert-St Louis

Mon 1/5

6:35 pm-2:45 pm

2 stops38h 10m

$866

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Thu 12/18

6:00 am-3:29 pm

2 stops39h 29m

Lambert-St Louis

Tue 1/6

4:05 pm-11:40 am

2 stops37h 35m

$871

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Tue 8/26

10:00 pm-1:07 pm

3 stops45h 07m

$516

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Tue 1/6

2:10 pm-11:01 am

3 stops50h 51m

$587

PortoSt. Louis

OPO - STL

OPOSTL

Porto

Wed 10/29

6:00 am-2:55 pm

1 stop13h 55m

$673

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/16

Showing 1-10 of 14 results
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Best time to book a flight from Porto to Missouri

Have a flexible travel schedule? Discover the best time to fly to Missouri from Porto 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 Porto to Missouri
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Porto to Missouri. 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 from for flights from Porto to Missouri?

    If you book a flight to Missouri from Porto, you will be flying from Porto, which is the city’s only airport. Porto (OPO) is located 6.8 mi from the center of Porto.

  • How long is the flight from Porto to Missouri?

    For as low as $800, United Airlines can have you in Missouri from Porto in 36h 09m. Airlines will cover a distance of 4154 mi.

  • Can I find deals for flights from Porto to Missouri that include hotel bookings?

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Porto to Missouri (average of $311). Flying from Porto to Missouri in March is currently the most expensive (average of $356). 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

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Alternative routes for Porto to Missouri

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