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$468+ Cheap flights from Missouri 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 12/2. Fares are subject to change and may not be available on all flights or dates of travel.
STL — OPO
Dec 26 — Jan 21
Fri 12/26
Fri 1/2
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 November 26, 2025.

This Delta deal was found by Cheapflights users on 11/25. 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 12/22:38 pmSTL - OPO
2 stops13h 52mDelta
Fri 12/1211:20 amOPO - STL
2 stops28h 30mDelta
Deal found 11/25$468
This Delta deal was found by Cheapflights users on 11/25. 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 12/36:05 amSTL - OPO
2 stops22h 25mDelta
Fri 12/1211:20 amOPO - STL
2 stops32h 33mDelta
Deal found 11/25$469
This Delta deal was found by Cheapflights users on 11/25. 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 12/22:38 pmSTL - OPO
2 stops13h 52mDelta
Mon 12/1511:25 amOPO - STL
2 stops35h 10mDelta
Deal found 11/25$481
This Delta deal was found by Cheapflights users on 11/25. 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 12/36:05 amSTL - OPO
2 stops22h 25mDelta
Mon 12/1511:25 amOPO - STL
2 stops35h 10mDelta
Deal found 11/25$482
This Mytrip deal was found by Cheapflights users on 11/25. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:15 pmMCI - OPO
2 stops30h 50mMultiple Airlines
Thu 1/16:40 amOPO - MCI
2 stops22h 19mMultiple Airlines
Deal found 11/25$1,606

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 November 26, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$440
(Kiwi.com)

Popular in

July

Cheapest in

November

Average price

$612
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
Highest demand for flights based on searches. 18% potential increase in price ($244 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 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 November 26, 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

Sat 2/14

11:53 am-11:45 am

2 stops17h 52m

Porto

Tue 2/24

8:20 am-9:42 pm

2 stops19h 22m

$484

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Fri 1/23

9:57 am-10:30 am

2 stops18h 33m

Porto

Tue 1/27

6:05 am-9:03 pm

2 stops20h 58m

$491

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Wed 2/11

11:29 am-1:15 pm

2 stops19h 46m

Porto

Mon 2/23

6:00 am-9:59 pm

2 stops21h 59m

$492

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Tue 2/17

2:12 pm-10:30 am

2 stops14h 18m

Porto

Thu 2/26

6:35 am-9:04 pm

2 stops20h 29m

$492

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Tue 2/17

6:00 am-10:30 am

2 stops22h 30m

Porto

Wed 2/25

6:00 am-7:17 pm

2 stops19h 17m

$492

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Tue 2/17

2:12 pm-10:30 am

2 stops14h 18m

Porto

Tue 2/24

6:05 am-11:26 pm

2 stops23h 21m

$492

St. LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Fri 2/6

3:31 pm-3:25 pm

2 stops17h 54m

Porto

Tue 2/10

6:05 am-11:37 pm

2 stops23h 32m

$497

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Sat 2/14

5:30 pm-3:05 pm

2 stops15h 35m

Porto

Sat 2/21

6:00 am-8:06 pm

2 stops20h 06m

$502

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Thu 1/8

10:00 am-11:40 am

2 stops19h 40m

Porto

Thu 1/15

6:00 am-7:56 pm

2 stops19h 56m

$502

Kansas CityPorto

MCI - OPO

MCIOPO

Kansas City

Fri 1/9

11:29 am-2:45 pm

2 stops21h 16m

Porto

Fri 1/16

6:00 am-10:32 am

2 stops34h 32m

$502

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/26

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, February is the cheapest month in which you can book a flight from Missouri to Porto (average of $534). Flying from Missouri to Porto in July is currently the most expensive (average of $967). 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 November 26, 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 17h 52m. 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, February is the cheapest month in which you can book a flight from Missouri to Porto (average of $534). Flying from Missouri to Porto in July is currently the most expensive (average of $967). 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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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 November 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$549Average$1,277FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$564Average$1,075FlexibilityNo cancel feeOn-time69%
DeltaCheapest$713Average$963FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$787Average$1,005FlexibilityNo cancel feeOn-time67%

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