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$327+ 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 3/22. Fares are subject to change and may not be available on all flights or dates of travel.
STL — OPO
Feb 13 — Feb 201
Fri 2/13
Fri 2/20
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 January 14, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$445
(KAYAK)

One-way from

$327
(Kiwi.com)

Popular in

January

Cheapest in

February

Average price

$1,434
Provider with most accurate pricing for Lambert-St Louis-Porto flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Porto flights.
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From Missouri to Porto
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One-way flight from Missouri to Porto
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High demand for flights, 7% potential price rise
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Cheapest flight prices on average. 3% potential price decrease ($39 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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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 January 14, 2026.

This KAYAK deal was found by Cheapflights users on 1/12. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/2511:39 am
STL
-
OPO
1 stop15h 51m
Lufthansa
Wed 3/412:35 pm
OPO
-
STL
1 stop17h 30m
Lufthansa
Deal found 1/12$445
This Expedia deal was found by Cheapflights users on 1/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/191:56 pm
MCI
-
OPO
2 stops15h 49m
Iberia
Tue 2/38:20 am
OPO
-
MCI
2 stops20h 19m
Iberia
Deal found 1/12$451
This British Airways deal was found by Cheapflights users on 1/12. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/11:35 pm
STL
-
OPO
2 stops21h 05m
British Airways
Thu 2/128:20 am
OPO
-
STL
2 stops18h 52m
British Airways
Deal found 1/12$453
This American Airlines deal was found by Cheapflights users on 1/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/110:17 am
STL
-
OPO
2 stops15h 23m
American Airlines
Thu 2/128:20 am
OPO
-
STL
2 stops18h 52m
American Airlines
Deal found 1/12$461
This Rumbo deal was found by Cheapflights users on 1/12. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/196:06 am
MCI
-
OPO
2 stops23h 39m
Multiple Airlines
Tue 2/38:20 am
OPO
-
MCI
2 stops20h 19m
Multiple Airlines
Deal found 1/12$465
This Expedia deal was found by Cheapflights users on 1/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/3111:55 am
STL
-
OPO
2 stops37h 45m
Iberia
Mon 2/168:40 pm
OPO
-
STL
2 stops30h 32m
Iberia
Deal found 1/13$471
This United Airlines deal was found by Cheapflights users on 1/11. 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 3/15:30 pm
MCI
-
OPO
2 stops34h 00m
United Airlines
Fri 3/136:00 am
OPO
-
MCI
2 stops20h 59m
United Airlines
Deal found 1/11$478
This Iberia deal was found by Cheapflights users on 1/12. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/269:35 am
STL
-
OPO
2 stops16h 05m
Iberia
Thu 3/58:20 am
OPO
-
STL
2 stops18h 52m
Iberia
Deal found 1/12$486
This Ovago deal was found by Cheapflights users on 1/12. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/910:58 am
MCI
-
OPO
2 stops14h 42m
Multiple Airlines
Mon 2/168:40 pm
OPO
-
MCI
2 stops33h 03m
Multiple Airlines
Deal found 1/12$489
This Kiwi.com deal was found by Cheapflights users on 1/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/303:50 pm
STL
-
OPO
1 stop13h 50m
Lufthansa
Thu 2/126:00 am
OPO
-
STL
2 stops21h 40m
Lufthansa
Deal found 1/11$491
This Gurufare deal was found by Cheapflights users on 1/12. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/85:45 pm
MCI
-
OPO
2 stops23h 40m
Lufthansa
Tue 4/1412:35 pm
OPO
-
MCI
1 stop15h 55m
Lufthansa
Deal found 1/12$498
This American Airlines deal was found by Cheapflights users on 1/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/275:00 am
MCI
-
OPO
2 stops20h 40m
American Airlines
Fri 3/68:40 pm
OPO
-
MCI
2 stops18h 17m
American Airlines
Deal found 1/13$511

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 January 14, 2026.
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

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 2/25

11:39 am-9:30 am

1 stop15h 51m

Porto

Wed 3/4

12:35 pm-12:05 am

1 stop17h 30m

$445

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sun 2/1

1:35 pm-4:40 pm

2 stops21h 05m

Porto

Thu 2/12

8:20 am-9:12 pm

2 stops18h 52m

$453

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sun 2/1

12:01 pm-4:00 pm

2 stops21h 59m

Porto

Thu 2/12

8:20 am-11:48 pm

2 stops21h 28m

$461

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sat 1/31

11:55 am-7:40 am

2 stops37h 45m

Porto

Mon 2/16

8:40 pm-9:12 pm

2 stops30h 32m

$471

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Sun 3/1

5:30 pm-9:30 am

2 stops34h 00m

Porto

Fri 3/13

6:00 am-9:59 pm

2 stops20h 59m

$478

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Thu 2/26

9:35 am-7:40 am

2 stops16h 05m

Porto

Thu 3/5

8:20 am-9:12 pm

2 stops18h 52m

$486

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Mon 2/9

10:58 am-7:40 am

2 stops14h 42m

Porto

Mon 2/16

8:40 pm-11:43 pm

2 stops33h 03m

$489

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Wed 4/8

5:45 pm-11:25 pm

2 stops23h 40m

Porto

Tue 4/14

12:35 pm-10:30 pm

1 stop15h 55m

$498

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Fri 1/30

10:17 am-11:45 am

2 stops19h 28m

Porto

Thu 2/12

8:20 am-9:12 pm

2 stops18h 52m

$511

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Fri 1/30

2:54 pm-4:00 pm

2 stops19h 06m

Porto

Thu 2/12

8:20 am-11:48 pm

2 stops21h 28m

$511

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/13

Showing 1-10 of 23 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 $492). Flying from Missouri to Porto in July is currently the most expensive (average of $891). 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.

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 51m. The distance from Missouri to Porto is about 4154 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 $492). Flying from Missouri to Porto in July is currently the most expensive (average of $891). 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
Vila Nova de Gaia

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Alternative routes for Missouri to Porto

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Missouri to Porto

Discover the top 4 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 January 14, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$492Average$870FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$520Average$1,207FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$564Average$1,047FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$787Average$969FlexibilityNo cancel feeOn-time67%

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