Cheap flights from St. Louis (STL) to Porto (OPO) from $420

Currently, January is the cheapest month in which you can book a flight from St. Louis to Porto (average of $523). Flying from St. Louis to Porto in June is currently the most expensive (average of $1,016). 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.

• Can I find flights from St. Louis to Porto for under $900 on Cheapflights?

  Yes, there are multiple flights from St. Louis to Porto for under $900. The cheapest flight booked recently is on American Airlines for just $886, but on average you can expect to pay $1,009.

• What are the cheapest airlines flying from St. Louis to Porto round-trip?

  American Airlines, at $886, was found to be the cheapest airline from St. Louis to Porto.Alternate airlines to your destination round-trip include Delta and Iberia. Users have found that American Airlines is 19% cheaper than the other options available to this destination.

• What are the cheapest airlines to fly from St. Louis to Porto one-way?

  For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $529. Users have also found prices from $548 and $556 on Lufthansa and Air France, respectively.

• What does STL to OPO mean?

  These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Lambert-St Louis Airport to Porto Airport flight would often be abbreviated as a STL to OPO flight.

• Can I find deals for flights from St. Louis to Porto that include extra baggage allowance?

  The amount of baggage you can bring on your St. Louis to Porto flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

• Can I find deals on flights from St. Louis to Porto with specific airlines?

  Yes, Cheapflights allows you to browse and filter St. Louis to Porto flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

• Can I find deals for flights from St. Louis to Porto that include hotel bookings?

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

• How can I find direct flights from St. Louis to Porto?

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

• Can I find deals for business class flights from St. Louis to Porto?

  Yes. Cheapflights offers flight deals from St. Louis 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.

• Can I find deals for flights from St. Louis to Porto that allow pets onboard?

  Many airlines flying from St. Louis to Porto offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

• Can I find deals on last-minute flights from St. Louis to Porto?

  Yes, you can often find last-minute deals on St. Louis to Porto flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

• How recently were the St. Louis to Porto flight deals updated?

  The St. Louis to Porto flight deals you see on this page were last updated on 5/7.