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

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How to find the cheapest flight from
St. Louis (STL) to Porto (OPO)

All the information you need to plan the best STL to OPO flight in 2022: compare St. Louis to Porto flight prices with the expected peak season, weather and rainfall in Porto.
What is the cheapest month to fly from St. Louis to Porto?

Flights from St. Louis to Porto lean towards being more expensive in May. Prices are generally better when you fly from St. Louis to Porto in August, with the cheapest ticket starting at $538.

When is the cheapest time to fly from St. Louis to Porto (STL - OPO)?

Unlike in the afternoon, when flights are generally more expensive, you can save up to 18% on flights from St. Louis to Porto by exploring options for tickets in the morning.

What is the cheapest day to fly round-trip from St. Louis to Porto?

Users have found that leaving on a Sunday can be a cost-effective option. It’s possible to save up to 67% on your flight compared to booking on days when demand is much higher.

Cheap flights from St. Louis to Porto in July, August 2022

The best prices found for STL to OPO flights for July, August
30 Aug - 29 Nov
$782pp
STL
Lambert-St Louis
Delta
   
2 STOPS
OPO
Porto
OPO
Porto
Delta
   
2 STOPS
STL
Lambert-St Louis
30 Aug - 29 Nov
$787pp
STL
Lambert-St Louis
Air Canada
   
2 STOPS
OPO
Porto
OPO
Porto
Air Canada
   
2 STOPS
STL
Lambert-St Louis
30 Aug - 29 Nov
$822pp
STL
Lambert-St Louis
Lufthansa
   
2 STOPS
OPO
Porto
OPO
Porto
Lufthansa
 
1 STOP
STL
Lambert-St Louis

Lambert-St Louis to Porto 2022 flight deals

Cheap flights to Porto from St. Louis found for this year
26 Oct - 2 Nov
$590pp
STL
Lambert-St Louis
Multiple Airlines
   
2 STOPS
OPO
Porto
OPO
Porto
Iberia
   
2 STOPS
STL
Lambert-St Louis
26 Oct - 2 Nov
$605pp
STL
Lambert-St Louis
Multiple Airlines
   
2 STOPS
OPO
Porto
OPO
Porto
Iberia
   
2 STOPS
STL
Lambert-St Louis
26 Oct - 2 Nov
$621pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
OPO
Porto
OPO
Porto
Lufthansa
 
1 STOP
STL
Lambert-St Louis

Cheap United Airlines flights from St. Louis to Porto

27 Sep - 11 Oct
$809pp
STL
Lambert-St Louis
United Airlines
 
1 STOP
OPO
Porto
OPO
Porto
United Airlines
 
1 STOP
STL
Lambert-St Louis
27 Sep - 11 Oct
$814pp
STL
Lambert-St Louis
United Airlines
   
2 STOPS
OPO
Porto
OPO
Porto
United Airlines
 
1 STOP
STL
Lambert-St Louis
26 Sep - 30 Sep
$914pp
STL
Lambert-St Louis
United Airlines
 
1 STOP
OPO
Porto
OPO
Porto
United Airlines
   
2 STOPS
STL
Lambert-St Louis

Cheap American Airlines flights from St. Louis to Porto

27 Sep - 11 Oct
$828pp
STL
Lambert-St Louis
American Airlines
   
2 STOPS
OPO
Porto
OPO
Porto
American Airlines
     
3 STOPS
STL
Lambert-St Louis
13 Sep - 24 Sep
$883pp
STL
Lambert-St Louis
American Airlines
   
2 STOPS
OPO
Porto
OPO
Porto
American Airlines
     
3 STOPS
STL
Lambert-St Louis
20 Sep - 1 Oct
$885pp
STL
Lambert-St Louis
American Airlines
   
2 STOPS
OPO
Porto
OPO
Porto
American Airlines
   
2 STOPS
STL
Lambert-St Louis

Related info for your journey

Useful info, stats and facts about <span class="emphasized">St. Louis</span> to <span class="emphasized">Porto</span> flights.

Flight FAQs

From St. Louis to Porto

Which airlines flying from Lambert-St Louis to Porto have flexible cancellations due to COVID-19?

United Airlines, Air Canada, and American Airlines are some of the carriers that may have flexible cancellation policies. You can use our site to filter for other airlines that may also have this kind of flexibility.

Can I find flights from St. Louis to Porto for under $600 on Cheapflights?

Yes, there are multiple flights from St. Louis to Porto for under $600. The cheapest flight booked recently is on Multiple Airlines for just $590, but on average you can expect to pay $769.

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

Lufthansa, at $650, was found to be the cheapest airline from St. Louis to Porto.Alternate airlines to your destination round-trip include Delta and United Airlines. Users have found that Lufthansa is 23% cheaper than the other options available to this destination.

What are the most popular airlines that fly from St. Louis to Porto?

When booking a flight from St. Louis to Porto, you may want to consider flying on American Airlines, Air Canada or Delta as they are the most popular for this route.

What are the cheapest flights from St. Louis to Porto?

Looking for the cheapest flight from St. Louis to Porto? While on average our users pay $1,341, our data indicates the cheapest price to be $505. The most popular route (Lambert-St Louis - Porto), is priced around $590.

COVID Restrictions

View COVID Travel Restrictions for Porto, Portugal

Do I need a COVID test to fly to Porto from St. Louis?

Information is based on travel restrictions from Lambert-St Louis to Porto

Most visitors from Lambert-St Louis can enter Porto without restrictions.

COVID-19 testing requirements
Visitors from Lambert-St Louis are not required to present a negative COVID-19 PCR test or antigen result upon entering Porto.

Quarantine requirements
Visitors from Lambert-St Louis are not required to quarantine after entering Porto.

Do I need a test to fly back to St. Louis from Porto?

Returning to Lambert-St Louis from Porto

COVID-19 testing requirements
Visitors from Porto are not required to present a negative COVID-19 PCR test or antigen result upon entering Lambert-St Louis.

Quarantine requirements
Visitors from Porto are not required to quarantine after entering Lambert-St Louis.

Hide COVID Travel Restrictions for Porto, Portugal

Alternative routes for St. Louis to Porto

See prices for flight routes from nearby airports that may be better suited for you.
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