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Find St. Louis to Porto flights starting at US$551.
We've found these cheap flights for you. You can book one-way or return flight tickets.
- One way
- Round-trip
- STL06:0818h 47m1 stopOPO06:55Fri, Jul 19|St. Louis - Porto|United AirlinesUS$551US$1,16653% OFF53% OFFUS$1,166US$551
- STL06:0821h 37m1 stopOPO09:45Wed, Aug 7|St. Louis - Porto|United AirlinesUS$557US$1,16652% OFF52% OFFUS$1,166US$557
- STL15:2513h 55m1 stopOPO11:20Wed, Aug 7|St. Louis - Porto|LufthansaUS$613US$1,16647% OFF47% OFFUS$1,166US$613
- STL06:0222h 33m1 stopOPO10:35Sun, Sep 1|St. Louis - Porto|United AirlinesUS$626US$626
- STL15:2513h 55m1 stopOPO11:20Sun, Sep 1|St. Louis - Porto|LufthansaUS$828US$828
- STL13:003h 5mDirectOPO14:00Wed, Jul 10|St. Louis - Porto|United AirlinesFind More FlightsFind More Flights
Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.
When is the cheapest time to fly from St. Louis to Porto?
We monitor flight fares to help you find the best deals effortlessly
Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.
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Find Cheapest Airlines Flying from St. Louis to Porto
Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.
![American Airlines](https://pic.tripcdn.com/airline_logo/3x/aa.png?proc=resize/m_w,w_600,h_600,B0B3)
American Airlines
From US$523
![United Airlines](https://pic.tripcdn.com/airline_logo/3x/ua.png?proc=resize/m_w,w_600,h_600,B0B3)
United Airlines
From US$533
![Delta Air Lines](https://pic.tripcdn.com/airline_logo/3x/dl.png?proc=resize/m_w,w_600,h_600,B0B3)
Delta Air Lines
From US$588
![Lufthansa](https://pic.tripcdn.com/airline_logo/3x/lh.png?proc=resize/m_w,w_600,h_600,B0B3)
Lufthansa
From US$611
![Iberia](https://pic.tripcdn.com/airline_logo/3x/ib.png?proc=resize/m_w,w_600,h_600,B0B3)
Iberia
From US$619
![Air Canada](https://pic.tripcdn.com/airline_logo/3x/ac.png?proc=resize/m_w,w_600,h_600,B0B3)
Air Canada
From US$715
![British Airways](https://pic.tripcdn.com/airline_logo/3x/ba.png?proc=resize/m_w,w_600,h_600,B0B3)
British Airways
From US$795
![Air France](https://pic.tripcdn.com/airline_logo/3x/af.png?proc=resize/m_w,w_600,h_600,B0B3)
Air France
From US$852
![KLM](https://pic.tripcdn.com/airline_logo/3x/kl.png?proc=resize/m_w,w_600,h_600,B0B3)
KLM
From US$866
![Brussels Airlines](https://pic.tripcdn.com/airline_logo/3x/sn.png?proc=resize/m_w,w_600,h_600,B0B3)
Brussels Airlines
From US$866
![airlines](https://pic.tripcdn.com/airline_logo/3x/mu.png_.webp?proc=resize/m_w,w_600,h_600,B0B3)
ANA airlines
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Alternative Routes for St. Louis to Porto Flights
Searching for potential routes that might be cheaper and faster? Check out these alternative flights from St. Louis to Porto.
- CheapestSTL10:2519h 15m2 transferOPO11:40St. Louis Lambert International Airport - Francisco Sa Carneiro International AirportWed, Aug 28American AirlinesUS$523
- STL10:2519h 15m2 transferOPO11:40St. Louis Lambert International Airport - Francisco Sa Carneiro International AirportWed, Aug 28American AirlinesUS$523Find More Flights
How do I find the cheapest flights?
How to find a cheap flight from St. Louis to Porto
Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from St. Louis to Porto. Book your flights at the right time and save more.
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Compare prices on travel agency and airline websites.
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Flight Information for St. Louis to Porto Flights
Cheapest direct flight price | US$551 |
---|---|
Cheapest month | June |
Peak season for travel | September |
Flight distance | 6,685.08km |
Popular airline | American Airlines |
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