$528 Find Cheap Flights from Porto to St. Louis - Compare and Save

In the last 5 days, the lowest price for a flight from Porto to St. Louis was $528 for a one-way ticket and $933 for a round-trip.

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

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

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 Porto to St. Louis.

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Porto 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 St. Louis with an airline and back to Porto with another airline. Booking your flights between Porto and STL 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 St. Louis from Porto up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.