$348 Find Cheap Flights from St. Louis to Porto - Compare and Save

In the last 5 days, the lowest price for a flight from St. Louis to Porto was $348 for a one-way ticket and $741 for a round-trip.

Yes, you’ll need a passport to travel to Porto from St. Louis.

St. Louis and Porto are both served by 1 main airport. You will leave St. Louis from Lambert-St Louis and will be arriving at Porto.

We unfortunately don’t have that data for this specific route.

Star Alliance is the only airline alliance operating flights between St. Louis and Porto.

The two airlines most popular with KAYAK users for flights from St. Louis to Porto are United Airlines and Lufthansa. With an average price for the route of $1,076 and an overall rating of 7.4, United Airlines is the most popular choice. Lufthansa is also a great choice for the route, with an average price of $786 and an overall rating of 6.8.

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Porto.

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Porto from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Porto with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and OPO can sometimes prove cheaper using this method.

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Porto from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.