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$304+ 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 2/2. Fares are subject to change and may not be available on all flights or dates of travel.
STL — OPO
nov. 9 — nov. 161
dom. 11/9
dom. 11/16
1 adult, Economy
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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 octubre 10, 2025.

This Billigflug deal was found by Cheapflights users on 10/9. 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 Billigflug is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/103:14 pmSTL - OPO
2 stops12h 16mMultiple Airlines
dom. 11/236:00 amOPO - STL
2 stops21h 54mMultiple Airlines
Deal found 10/9$502
This United Airlines deal was found by Cheapflights users on 10/8. 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.
mié. 11/1211:05 amSTL - OPO
2 stops16h 25mUnited Airlines
mié. 11/196:00 amOPO - STL
1 stop13h 55mUnited Airlines
Deal found 10/8$523
This KAYAK deal was found by Cheapflights users on 10/8. 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.
vie. 12/56:42 pmSTL - OPO
2 stops22h 58mLufthansa
vie. 12/126:00 amOPO - STL
1 stop13h 55mLufthansa
Deal found 10/8$529
This United Airlines deal was found by Cheapflights users on 10/9. 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.
lun. 11/1011:49 amSTL - OPO
1 stop15h 41mUnited Airlines
dom. 11/2312:35 pmOPO - STL
1 stop17h 09mUnited Airlines
Deal found 10/9$532
This Cheapflightsfares deal was found by Cheapflights users on 10/8. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/123:50 pmSTL - OPO
1 stop17h 35mLufthansa
mié. 11/196:00 amOPO - STL
1 stop13h 55mLufthansa
Deal found 10/8$534
This Cheapflightsfares deal was found by Cheapflights users on 10/8. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/56:42 pmSTL - OPO
2 stops22h 58mLufthansa
lun. 12/156:15 amOPO - STL
2 stops23h 27mLufthansa
Deal found 10/8$537
This United Airlines deal was found by Cheapflights users on 10/9. 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.
mié. 11/199:58 amMCI - OPO
2 stops17h 32mUnited Airlines
mié. 12/36:00 amOPO - MCI
2 stops21h 58mUnited Airlines
Deal found 10/9$538
This KAYAK deal was found by Cheapflights users on 10/8. 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.
mié. 11/1911:36 amMCI - OPO
2 stops30h 04mLufthansa
mié. 12/36:00 amOPO - MCI
2 stops21h 58mLufthansa
Deal found 10/8$540
This Delta deal was found by Cheapflights users on 10/8. 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.
mar. 12/22:11 pmSTL - OPO
2 stops14h 19mDelta
vie. 12/126:30 amOPO - STL
2 stops23h 10mDelta
Deal found 10/8$541
This United Airlines deal was found by Cheapflights users on 10/8. 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.
mar. 12/26:30 amSTL - OPO
2 stops23h 10mUnited Airlines
vie. 12/126:00 amOPO - STL
1 stop13h 55mUnited Airlines
Deal found 10/8$543
This Delta deal was found by Cheapflights users on 10/8. 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.
vie. 12/55:12 pmSTL - OPO
2 stops16h 13mDelta
sáb. 12/136:00 amOPO - STL
2 stops23h 27mDelta
Deal found 10/8$547
This Gurufare deal was found by Cheapflights users on 10/9. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/106:32 pmMCI - OPO
2 stops34h 43mLufthansa
dom. 10/1911:05 amOPO - MCI
2 stops40h 40mLufthansa
Deal found 10/9$1,297

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 octubre 10, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$502
(Billigflug)

One-way from

$304
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$973
Provider with most accurate pricing for Lambert-St Louis-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Porto flights.
Search Deals
From Missouri to Porto
Search Deals
One-way flight from Missouri to Porto
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($242 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($35 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

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 octubre 10, 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

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

lun. 11/10

11:49 am-9:30 am

1 stop15h 41m

Porto

dom. 11/23

12:35 pm-11:44 pm

1 stop17h 09m

$532

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

mié. 11/19

9:58 am-9:30 am

2 stops17h 32m

Porto

mié. 12/3

6:00 am-9:58 pm

2 stops21h 58m

$538

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

mié. 11/12

11:20 am-9:30 am

2 stops16h 10m

Porto

mié. 11/19

6:00 am-9:54 pm

2 stops21h 54m

$538

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

mié. 11/19

11:36 am-11:40 pm

2 stops30h 04m

Porto

mié. 12/3

6:00 am-9:58 pm

2 stops21h 58m

$540

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

mié. 11/12

2:36 pm-10:30 am

2 stops13h 54m

Porto

mié. 11/19

6:00 am-4:33 pm

2 stops16h 33m

$541

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

mar. 12/2

2:11 pm-10:30 am

2 stops14h 19m

Porto

sáb. 12/13

6:00 am-11:27 pm

2 stops23h 27m

$541

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

mié. 1/7

10:45 am-10:30 am

2 stops17h 45m

Porto

jue. 1/15

6:35 am-8:39 pm

2 stops20h 04m

$541

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

mié. 1/7

6:45 am-10:30 am

2 stops21h 45m

Porto

dom. 1/18

5:00 am-9:04 am

2 stops34h 04m

$541

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

mar. 12/2

7:05 am-10:30 am

2 stops21h 25m

Porto

lun. 12/15

11:15 am-11:40 pm

2 stops18h 25m

$541

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

mié. 1/7

10:45 am-10:30 am

2 stops17h 45m

Porto

vie. 1/16

6:30 am-11:40 pm

2 stops23h 10m

$541

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/8

Showing 1-10 of 20 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, November is the cheapest month in which you can book a flight from Missouri to Porto (average of $560). Flying from Missouri to Porto in June is currently the most expensive (average of $1,033). 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 octubre 10, 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 32% on flights from Missouri to Porto by exploring options for tickets at noon.

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 13h 54m. 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, November is the cheapest month in which you can book a flight from Missouri to Porto (average of $560). Flying from Missouri to Porto in June is currently the most expensive (average of $1,033). 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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See prices for flight routes from nearby airports that may be better suited for you.
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Top 2 airlines flying from Missouri to Porto

Discover the top 2 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 octubre 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$564Average$1,121FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$601Average$1,277FlexibilityNo cancel feeOn-time76%

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