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

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

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

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

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

One-stop flights from St. Louis to Porto most commonly connect through: • Newark (EWR) - 54% of one-stop connections • Montreal Pierre Elliott Trudeau Intl (YUL) - 32% of one-stop connections • Frankfurt am Main (FRA) - 11% of one-stop connections • New York John F Kennedy Intl (JFK) - 4% of one-stop connections

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

Yes. Flexible dates can save you up to 57% on flights from St. Louis to Porto. Thursday is the cheapest departure day at $485 round-trip on average, while Monday is the most expensive at $1,127, a difference of $642. 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 Porto?

Some of the most popular sights in Porto are Ribeira Square, Avenida dos Aliados and Mercado do Bolhão. These are among the most viewed places in Porto on KAYAK.

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

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

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

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.

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

One-way fares from St. Louis to Porto are currently higher than usual. Average one-way flight prices are about $1,052, which is 55% above the typical average for this route.

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

Flying via Montreal Pierre Elliott Trudeau Intl (YUL) gives the shortest average 1-stop total travel time at 12h 15m, compared with 12h 57m via New York John F Kennedy Intl (JFK) and 13h 51m via Frankfurt am Main (FRA).

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

Porto is 5 hours ahead of St. Louis (Western European Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

What car rental options are available at Porto Airport (OPO)?

Porto Airport (OPO) hosts 5 major car rental companies, with daily rates averaging $24 for economy cars. Top options include: • GREEN MOTION • Drive on Holiday • Klass Wagen • Goldcar Rental SP • Sixt

How much should I expect to pay for a St. Louis to Porto flight?

Round-trip flights from St. Louis to Porto range from $786 to $1,190, with an average of $995 over the past 12 months. Anything below $786 counts as a good deal.

What's the cheapest day of the week to fly from St. Louis to Porto?

Based on deals KAYAK users found in the last 12 months, Thursday is the cheapest day of the week to fly from St. Louis to Porto. It’s 52% cheaper than the average day, while Monday is the most expensive, with prices 13% higher.

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

United Airlines ($729) and Lufthansa ($789) are the cheapest airlines to fly round-trip from St. Louis to Porto according to KAYAK data over the last 5 days.

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

Newark (EWR) is the most popular layover for the St. Louis to Porto route. 54% of KAYAK users who booked 1-stop round-trips over the past 3 months connected via EWR.

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

Flights via Frankfurt am Main (FRA) offer the most affordable fares, with an average round-trip price of $583. Based on KAYAK data over the past 3 months.

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

Montreal Pierre Elliott Trudeau Intl (YUL) had the shortest average connection time for St. Louis to Porto layovers at 7h 16m over the past 3 months.

$354 CHEAP FLIGHTS from St. Louis to Porto (STL - OPO)

Save 25% 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

$705

Typical prices: $786-$1,190

Air Canada, Lufthansa

Wed 3/21Mon 3/26

STL - OPO • 2 stops

Cheapest one-way

$354

Typical prices: $487-$877

United Airlines

Tue 3/13

STL - OPO • 2 stops

Nonstop flights

Not available

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

Insights

When to travel

January

Cheapest • 49% price drop

August

Most popular

Good to know

Top layover airports

Frankfurt am Main (FRA)

Cheapest • Avg $583 (round-trip)

Montreal Pierre Elliott Trudeau Intl (YUL)

Shortest trip • 12h 15m (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 Porto!

Flight Deals

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

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

Round-trip

One-way

Last minute

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

Sun, Mar 21 - Fri, Mar 26

4:05 pm - 11:15 amSTL Lambert-St Louis-OPO Porto

38h 10m2 stops Toronto Pearson Intl Zurich

6:00 am - 2:45 pmOPO Porto-STL Lambert-St Louis

13h 45m1 stop Frankfurt am Main

$705Multiple Airlines

Sun, Mar 21 - Fri, Mar 26

4:05 pm - 11:15 amSTL Lambert-St Louis-OPO Porto

38h 10m2 stops Toronto Pearson Intl Zurich

6:00 am - 3:26 pmOPO Porto-STL Lambert-St Louis

38h 26m2 stops Frankfurt am Main Toronto Pearson Intl

$713Multiple Airlines

Sun, Mar 21 - Fri, Mar 26

8:58 am - 9:30 amSTL Lambert-St Louis-OPO Porto

19h 32m1 stop Newark

6:00 am - 2:45 pmOPO Porto-STL Lambert-St Louis

13h 45m1 stop Frankfurt am Main

$718Multiple Airlines

Sun, Mar 21 - Fri, Mar 26

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

23h 30m2 stops Chicago O'Hare Intl Newark

10:35 am - 4:56 pmOPO Porto-STL Lambert-St Louis

35h 21m3 stops Frankfurt am Main Toronto Pearson Intl Newark

$729United Airlines

Mon, Dec 7 - Wed, Dec 23

11:05 am - 9:30 amSTL Lambert-St Louis-OPO Porto

16h 25m1 stop Newark

6:00 am - 1:45 pmOPO Porto-STL Lambert-St Louis

13h 45m1 stop Frankfurt am Main

$754Multiple Airlines

Mon, Dec 7 - Wed, Dec 23

6:30 am - 9:30 amSTL Lambert-St Louis-OPO Porto

21h 00m2 stops Chicago O'Hare Intl Newark

6:00 am - 1:45 pmOPO Porto-STL Lambert-St Louis

13h 45m1 stop Frankfurt am Main

$758United Airlines

Mon, Dec 7 - Wed, Dec 23

5:25 am - 9:30 amSTL Lambert-St Louis-OPO Porto

22h 05m2 stops Chicago O'Hare Intl Newark

12:35 pm - 10:42 amOPO Porto-STL Lambert-St Louis

28h 07m2 stops Newark Chicago O'Hare Intl

$778United Airlines

Sat, Jan 30 - Sun, Feb 14

6:45 pm - 3:20 pmSTL Lambert-St Louis-OPO Porto

38h 35m2 stops Chicago O'Hare Intl Frankfurt am Main

6:00 am - 9:23 pmOPO Porto-STL Lambert-St Louis

21h 23m2 stops Frankfurt am Main Chicago O'Hare Intl

$789Lufthansa

Sun, Jan 31 - Sat, Feb 13

3:40 pm - 3:20 pmSTL Lambert-St Louis-OPO Porto

17h 40m1 stop Frankfurt am Main

4:10 pm - 1:45 pmOPO Porto-STL Lambert-St Louis

27h 35m1 stop Frankfurt am Main

$790Lufthansa

Wed, Nov 18 - Wed, Nov 25

3:40 pm - 11:45 amSTL Lambert-St Louis-OPO Porto

14h 05m1 stop Frankfurt am Main

6:00 am - 1:45 pmOPO Porto-STL Lambert-St Louis

13h 45m1 stop Frankfurt am Main

$814Lufthansa

Recent last minute flight deals from St. Louis to Porto

Sun, Nov 1 - Wed, Nov 11

11:28 am - 9:30 amSTL Lambert-St Louis-OPO Porto

16h 02m1 stop Newark

6:00 am - 1:45 pmOPO Porto-STL Lambert-St Louis

13h 45m1 stop Frankfurt am Main

$799United Airlines

Sun, Nov 1 - Wed, Nov 11

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

10h 30m1 stop Newark

6:00 am - 1:45 pmOPO Porto-STL Lambert-St Louis

13h 45m1 stop Frankfurt am Main

$799Multiple Airlines

Sun, Nov 1 - Wed, Nov 11

10:53 am - 9:30 amSTL Lambert-St Louis-OPO Porto

16h 37m2 stops Chicago O'Hare Intl Newark

6:00 am - 1:45 pmOPO Porto-STL Lambert-St Louis

13h 45m1 stop Frankfurt am Main

$803United Airlines

Sun, Nov 1 - Wed, Nov 11

11:00 am - 9:30 amSTL Lambert-St Louis-OPO Porto

16h 30m2 stops Houston George Bush Intcntl Newark

6:00 am - 1:45 pmOPO Porto-STL Lambert-St Louis

13h 45m1 stop Frankfurt am Main

$803Multiple Airlines

Sun, Nov 1 - Wed, Nov 11

11:28 am - 9:30 amSTL Lambert-St Louis-OPO Porto

16h 02m1 stop Newark

6:00 am - 1:45 pmOPO Porto-STL Lambert-St Louis

13h 45m1 stop Frankfurt am Main

$804United Airlines

Sun, Nov 1 - Wed, Nov 11

10:53 am - 9:30 amSTL Lambert-St Louis-OPO Porto

16h 37m2 stops Chicago O'Hare Intl Newark

6:00 am - 1:45 pmOPO Porto-STL Lambert-St Louis

13h 45m1 stop Frankfurt am Main

$808United Airlines

Sun, Nov 1 - Wed, Nov 11

10:35 am - 8:15 amSTL Lambert-St Louis-OPO Porto

15h 40m2 stops Detroit Metropolitan Wayne County New York John F Kennedy Intl

5:00 am - 4:31 pmOPO Porto-STL Lambert-St Louis

17h 31m2 stops Amsterdam Schiphol Minneapolis St Paul

$810Multiple Airlines

Sun, Nov 1 - Wed, Nov 11

7:30 am - 9:30 amSTL Lambert-St Louis-OPO Porto

20h 00m2 stops Chicago O'Hare Intl Newark

6:00 am - 9:40 pmOPO Porto-STL Lambert-St Louis

21h 40m2 stops Frankfurt am Main Chicago O'Hare Intl

$814United Airlines

Sat, Oct 31 - Wed, Nov 18

4:39 pm - 9:30 amSTL Lambert-St Louis-OPO Porto

35h 51m2 stops Denver Intl Newark

6:00 am - 1:45 pmOPO Porto-STL Lambert-St Louis

13h 45m1 stop Frankfurt am Main

$814Multiple Airlines

Sat, Oct 31 - Wed, Nov 18

4:39 pm - 9:30 amSTL Lambert-St Louis-OPO Porto

35h 51m2 stops Denver Intl Newark

6:00 am - 6:09 pmOPO Porto-STL Lambert-St Louis

18h 09m2 stops Frankfurt am Main Chicago O'Hare Intl

$818United Airlines

Booking Insights

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

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

Prices

Airlines

Layovers

What's the cheapest day of the week to fly from St. Louis to Porto?: Based on deals KAYAK users found in the last 12 months, Thursday is the cheapest day of the week to fly from St. Louis to Porto. It’s 52% cheaper than the average day, while Monday is the most expensive, with prices 13% higher.

Find deals

Low season	November
High season	August
Cheapest flight	$354

Beat the crowds with an average 74% drop in travelers.

The most popular month to fly with an average 94% increase in travelers.

One-way flight from St. Louis to Porto

When to book flights from St. Louis to Porto

Are your dates flexible? Find out the best times to travel from St. Louis to Porto 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.

What cabin classes can I book on flights from St. Louis to Porto?
Three cabin classes are available on flights from St. Louis to Porto:

• Economy Class
• Premium Economy Class
• Business Class
How long is a flight from St. Louis to Porto?
A nonstop flight from St. Louis to Porto takes 00m, covering 4,154 miles.
Do I need a passport to fly from St. Louis to Porto?
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.
How much should I expect to pay for a St. Louis to Porto flight?
Round-trip flights from St. Louis to Porto range from $786 to $1,190, with an average of $995 over the past 12 months. Anything below $786 counts as a good deal.
How are flight prices from St. Louis to Porto looking right now?
One-way fares from St. Louis to Porto are currently higher than usual. Average one-way flight prices are about $1,052, which is 55% above the typical average for this route.
What car rental options are available at Porto Airport (OPO)?
Porto Airport (OPO) hosts 5 major car rental companies, with daily rates averaging $24 for economy cars. Top options include:

• GREEN MOTION
• Drive on Holiday
• Klass Wagen
• Goldcar Rental SP
• Sixt
Which airports can I use when flying from St. Louis to Porto?
Flights from St. Louis to Porto usually depart from Lambert-St Louis (STL) and arrive at Porto (OPO).
Which airports do connecting flights from St. Louis to Porto pass through?
One-stop flights from St. Louis to Porto most commonly connect through:

• Newark (EWR) - 54% of one-stop connections
• Montreal Pierre Elliott Trudeau Intl (YUL) - 32% of one-stop connections
• Frankfurt am Main (FRA) - 11% of one-stop connections
• New York John F Kennedy Intl (JFK) - 4% of one-stop connections
Can I save money by using flexible dates for flights from St. Louis to Porto?
Yes. Flexible dates can save you up to 57% on flights from St. Louis to Porto. Thursday is the cheapest departure day at $485 round-trip on average, while Monday is the most expensive at $1,127, a difference of $642.

KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.
How much time can I save by choosing a different layover airport from St. Louis to Porto?
Flying via Montreal Pierre Elliott Trudeau Intl (YUL) gives the shortest average 1-stop total travel time at 12h 15m, compared with 12h 57m via New York John F Kennedy Intl (JFK) and 13h 51m via Frankfurt am Main (FRA).
What is the time difference between St. Louis and Porto?
Porto is 5 hours ahead of St. Louis (Western European Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.
What popular places can I visit in Porto?
Some of the most popular sights in Porto are Ribeira Square, Avenida dos Aliados and Mercado do Bolhão. These are among the most viewed places in Porto on KAYAK.

If your dates are flexible, aim for a Thursday departure and avoid flying on Monday. On this route, Thursday flights average $485, about $642 less than Monday fares (57% savings) based on the last 12 months.
If you can choose when to travel, plan your St. Louis to Porto trip for January. Fares historically average $510 round-trip in that month - typically $680 less than the most expensive month, which is September (based on the last 12 months).
If you're arriving late at night and need somewhere to stay, check out these hotels close to Porto Airport.

• Ap Aeroporto Porto

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STL - OPO

$354 Find Cheap Flights from St. Louis to Porto - Compare and Save

Everything you should know

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

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

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

Recent last minute flight deals from St. Louis to Porto

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

What's the cheapest day of the week to fly from St. Louis to Porto?

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

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

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

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

Key details for St. Louis to Porto flights

Low season

High season

Cheapest flight

When to book flights from St. Louis to Porto

Your St. Louis to Porto flight questions, answered

Your guide to booking St. Louis to Porto flights

More options for your flight from St. Louis to Porto

Complete your trip to Porto with a hotel stay or car rental

Information on your arrival and departure airports

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

Find direct flights to and from St. Louis and Porto

Flights from domestic origins to Porto

Flights to other popular destinations

Find deals for your return flight