Which airports can I use when flying from Porto to St. Louis?

Flights from Porto to St. Louis usually depart from Porto (OPO) and arrive at Lambert-St Louis (STL).

What cabin classes can I book on flights from Porto to St. Louis?

Two cabin classes are available on flights from Porto to St. Louis: • Economy Class • Business Class

Which airports do connecting flights from Porto to St. Louis pass through?

Connecting flights from Porto to St. Louis most commonly pass through: • Newark (EWR) - 50% of one-stop connections • Frankfurt am Main (FRA) - 50% of one-stop connections Together, these airports account for 100% of one-stop bookings on this route.

Can I save money by using flexible dates for flights from Porto to St. Louis?

Yes. Being flexible with your travel dates can save you up to 28% on the Porto to St. Louis route. Tuesday is the cheapest departure day at $780 round-trip on average, while Saturday is the most expensive at $1,083, a difference of $303. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

What popular places can I visit in St. Louis?

Some of the most popular sights in St. Louis are Downtown St. Louis, Busch Stadium and Enterprise Center. These are among the most viewed places in St. Louis on KAYAK.

How long is a flight from Porto to St. Louis?

A nonstop flight from Porto to St. Louis takes 0h 00m, covering 4,154 miles.

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

Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

Have flight prices from Porto to St. Louis changed much recently?

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $881 to $4,336. That means the highest observed fare was about 5x higher than the lowest one.

How are flight prices from Porto to St. Louis looking right now?

One-way fares from Porto to St. Louis are currently lower than usual. Average one-way flight prices are about $743, which is 23% below the typical average for this route.

How much time can I save by choosing a different layover airport from Porto to St. Louis?

Flying via Newark (EWR) gives the shortest average 1-stop total travel time at 12h 02m, compared with 13h 51m via Frankfurt am Main (FRA).

What is the time difference between Porto and St. Louis?

St. Louis is 6 hours behind Porto (Central Time vs Western European Time). Plan for the time shift when scheduling connections or first-day activities.

What car rental options are available at Lambert-St Louis Airport (STL)?

Lambert-St Louis Airport (STL) hosts 5 major car rental companies, with daily rates starting from around $31 for economy cars. Top options include: • Hertz • Budget • Alamo • Enterprise Rent-A-Car • Payless

What is the cheapest airline to fly from Porto to St. Louis?

American Airlines ($881) and United Airlines ($964) are the cheapest airlines to fly round-trip from Porto to St. Louis according to KAYAK data over the last 5 days.

What is the most popular layover airport when flying from Porto to St. Louis?

Newark (EWR) and Frankfurt am Main (FRA) are the most popular layovers for the Porto to St. Louis route. 50% of KAYAK users who booked 1-stop round-trips over the past 3 months connected via EWR or FRA.

What is the cheapest layover airport when flying from Porto to St. Louis?

Flights via Frankfurt am Main (FRA) offer the most affordable fares, with an average round-trip price of $915. Based on KAYAK data over the past 3 months.

When flying from Porto to St. Louis which airport offers the shortest layover?

Newark (EWR) had the shortest average connection time for Porto to St. Louis layovers at 406 minutes over the past 3 months.

$538 CHEAP FLIGHTS from Porto to St. Louis (OPO - STL)

Save 21% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Cheapest round-trip

$881

Typical prices: $915-$1,083

American Airlines

Mon 11/12Fri 11/16

OPO - STL • 2 stops

Cheapest one-way

$538

Typical prices: $703-$1,052

Multiple Airlines

Sun 11/25

OPO - STL • 3 stops

Nonstop flights

Not available

There are currently no direct flights between Porto and St. Louis. You'll need to take a connecting flight to reach the destination.

Insights

Top layover airports

Frankfurt am Main (FRA)

Cheapest • Avg $915 (round-trip)

Newark (EWR)

Shortest trip • 12h 02m (one-way)

Insights

Start a new search

KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to St. Louis!

Flight Deals

Cheap Flights from Porto to St. Louis (OPO-STL)

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Recent round-trip flight deals from Porto to St. Louis

Thu, Nov 12 - Mon, Nov 16

8:20 am - 5:47 pmOPO Porto-STL Lambert-St Louis

39h 27m2 stops Madrid Barajas Boston Logan Intl

5:29 pm - 4:00 pmSTL Lambert-St Louis-OPO Porto

40h 31m2 stops Chicago O'Hare Intl Madrid Barajas

$884American Airlines

Thu, Nov 12 - Mon, Nov 16

12:25 pm - 9:16 amOPO Porto-STL Lambert-St Louis

26h 51m2 stops Madrid Barajas Boston Logan Intl

9:50 am - 11:45 amSTL Lambert-St Louis-OPO Porto

19h 55m2 stops Boston Logan Intl Madrid Barajas

$886American Airlines

Thu, Nov 12 - Mon, Nov 16

8:20 am - 7:22 pmOPO Porto-STL Lambert-St Louis

17h 02m2 stops Madrid Barajas Chicago O'Hare Intl

1:20 pm - 11:45 amSTL Lambert-St Louis-OPO Porto

16h 25m2 stops Chicago O'Hare Intl Madrid Barajas

$922Iberia

Thu, Nov 12 - Mon, Nov 16

6:00 am - 11:24 pmOPO Porto-STL Lambert-St Louis

23h 24m2 stops Frankfurt am Main Chicago O'Hare Intl

11:29 am - 9:30 amSTL Lambert-St Louis-OPO Porto

16h 01m1 stop Newark

$967United Airlines

Thu, Nov 12 - Mon, Nov 16

6:00 am - 11:24 pmOPO Porto-STL Lambert-St Louis

23h 24m2 stops Frankfurt am Main Chicago O'Hare Intl

11:29 am - 9:30 amSTL Lambert-St Louis-OPO Porto

16h 01m1 stop Newark

$968United Airlines

Thu, Nov 12 - Mon, Nov 16

6:00 am - 11:24 pmOPO Porto-STL Lambert-St Louis

23h 24m2 stops Frankfurt am Main Chicago O'Hare Intl

11:29 am - 9:30 amSTL Lambert-St Louis-OPO Porto

16h 01m1 stop Newark

$970United Airlines

Thu, Nov 12 - Mon, Nov 16

6:00 am - 11:24 pmOPO Porto-STL Lambert-St Louis

23h 24m2 stops Frankfurt am Main Chicago O'Hare Intl

11:29 am - 9:30 amSTL Lambert-St Louis-OPO Porto

16h 01m1 stop Newark

$971United Airlines

Thu, Nov 12 - Mon, Nov 16

12:35 pm - 9:52 pmOPO Porto-STL Lambert-St Louis

15h 17m1 stop Newark

5:00 pm - 9:30 amSTL Lambert-St Louis-OPO Porto

10h 30m1 stop Newark

$991United Airlines

Thu, Nov 12 - Mon, Nov 16

12:35 pm - 9:52 pmOPO Porto-STL Lambert-St Louis

15h 17m1 stop Newark

5:00 pm - 9:30 amSTL Lambert-St Louis-OPO Porto

10h 30m1 stop Newark

$993United Airlines

Thu, Nov 12 - Mon, Nov 16

12:35 pm - 9:52 pmOPO Porto-STL Lambert-St Louis

15h 17m1 stop Newark

5:00 pm - 9:30 amSTL Lambert-St Louis-OPO Porto

10h 30m1 stop Newark

$994United Airlines

Booking Insights

Price, demand and travel trends for Porto to St. Louis flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights from Porto to St. Louis with more confidence.

Prices

Airlines

Layovers

How much is a round-trip flight from Porto to St. Louis?

Round-trip flights from Porto to St. Louis start at $881. Prices are below average for this route right now, with typical round-trip fares ranging from $915 to $1,083. The lowest price found in the past 5 days was $881 on American Airlines.

Find deals

Cheapest flight	$538

Flight from Porto to St. Louis

When to book flights from Porto to St. Louis

Are your dates flexible? Find out the best times to travel from Porto to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.

Estimated round-trip price

KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Which airports can I use when flying from Porto to St. Louis?
Flights from Porto to St. Louis usually depart from Porto (OPO) and arrive at Lambert-St Louis (STL).
What cabin classes can I book on flights from Porto to St. Louis?
Two cabin classes are available on flights from Porto to St. Louis:

• Economy Class
• Business Class
Which airports do connecting flights from Porto to St. Louis pass through?
Connecting flights from Porto to St. Louis most commonly pass through:

• Newark (EWR) - 50% of one-stop connections
• Frankfurt am Main (FRA) - 50% of one-stop connections
Together, these airports account for 100% of one-stop bookings on this route.
Can I save money by using flexible dates for flights from Porto to St. Louis?
Yes. Being flexible with your travel dates can save you up to 28% on the Porto to St. Louis route. Tuesday is the cheapest departure day at $780 round-trip on average, while Saturday is the most expensive at $1,083, a difference of $303. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.
What popular places can I visit in St. Louis?
Some of the most popular sights in St. Louis are Downtown St. Louis, Busch Stadium and Enterprise Center. These are among the most viewed places in St. Louis on KAYAK.
How long is a flight from Porto to St. Louis?
A nonstop flight from Porto to St. Louis takes 0h 00m, covering 4,154 miles.
Do I need a passport to fly from Porto to St. Louis?
Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.
Have flight prices from Porto to St. Louis changed much recently?
Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $881 to $4,336. That means the highest observed fare was about 5x higher than the lowest one.
How are flight prices from Porto to St. Louis looking right now?
One-way fares from Porto to St. Louis are currently lower than usual. Average one-way flight prices are about $743, which is 23% below the typical average for this route.
How much time can I save by choosing a different layover airport from Porto to St. Louis?
Flying via Newark (EWR) gives the shortest average 1-stop total travel time at 12h 02m, compared with 13h 51m via Frankfurt am Main (FRA).
What is the time difference between Porto and St. Louis?
St. Louis is 6 hours behind Porto (Central Time vs Western European Time). Plan for the time shift when scheduling connections or first-day activities.
What car rental options are available at Lambert-St Louis Airport (STL)?
Lambert-St Louis Airport (STL) hosts 5 major car rental companies, with daily rates starting from around $31 for economy cars. Top options include:
• Hertz
• Budget
• Alamo
• Enterprise Rent-A-Car
• Payless

If your dates can be flexible, aim for a Tuesday departure instead of Saturday. On this route, Tuesday flights average $780 - about $303 less than Saturday (28% savings) based on the last 12 months.
If you're arriving late at night and need somewhere to stay, check out these hotels close to Lambert-St Louis Airport.
- Drury Inn & Suites St. Louis Airport
- Renaissance St. Louis Airport Hotel
- DoubleTree by Hilton St. Louis Airport

More options for your flight from Porto to St. Louis

Add a hotel or car rental

Airports

Cabin class

Direct Flights

Origins

Other destinations

Return flight

Complete your trip to St. Louis with a hotel stay or car rental

Car rentals in St. Louis

Hotels in St. Louis

Vacations in St. Louis

OPO - STL

$538 Find Cheap Flights from Porto to St. Louis - Compare and Save

Everything you should know

Cheap Flights from Porto to St. Louis (OPO-STL)

Recent round-trip flight deals from Porto to St. Louis

Recent one-way flight deals from Porto to St. Louis

Price, demand and travel trends for Porto to St. Louis flights

How much is a round-trip flight from Porto to St. Louis?

What is the cheapest airline to fly from Porto to St. Louis?

What is the most popular layover airport when flying from Porto to St. Louis?

What is the cheapest layover airport when flying from Porto to St. Louis?

When flying from Porto to St. Louis which airport offers the shortest layover?

Key details for Porto to St. Louis flights

Cheapest flight

When to book flights from Porto to St. Louis

Your Porto to St. Louis flight questions, answered

Your guide to booking Porto to St. Louis flights

More options for your flight from Porto to St. Louis

Complete your trip to St. Louis with a hotel stay or car rental

Information on your arrival and departure airports

Cabin class types available on flights from Porto to St. Louis

Find direct flights to and from Porto and St. Louis

Flights from domestic origins to St. Louis

Flights to other popular destinations

Find deals for your return flight