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

Air Canada, at $892, was found to be the cheapest airline from St. Louis to Porto.Alternate airlines to your destination round-trip include Lufthansa and United Airlines. Users have found that Air Canada is 24% cheaper than the other options available to this destination.

How recently were the St. Louis to Porto flight deals updated?

The St. Louis to Porto flight deals you see on this page were last updated on 4/19.

Can I find flights from St. Louis to Porto for under $900 on Cheapflights?

Yes, there are multiple flights from St. Louis to Porto for under $900. The cheapest flight booked recently is on Air Canada for just $892, but on average you can expect to pay $1,178.

What does STL to OPO mean?

These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Lambert-St Louis Airport to Porto Airport flight would often be abbreviated as a STL to OPO flight.

Can I find deals for flights from St. Louis to Porto that include extra baggage allowance?

The amount of baggage you can bring on your St. Louis to Porto flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

Can I find deals on flights from St. Louis to Porto with specific airlines?

Yes, Cheapflights allows you to browse and filter St. Louis to Porto flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

Can I find deals for flights from St. Louis to Porto that include hotel bookings?

Yes. In addition to deals on St. Louis to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from St. Louis to Porto?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Porto.

Can I find deals for business class flights from St. Louis to Porto?

Yes. Cheapflights offers flight deals from St. Louis to Porto by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Can I find deals for flights from St. Louis to Porto that allow pets onboard?

Many airlines flying from St. Louis to Porto offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

Can I find deals on last-minute flights from St. Louis to Porto?

Yes, you can often find last-minute deals on St. Louis to Porto flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

Flights from St. Louis, MO to Porto, Portugal from $477

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Cheap flight deals from St. Louis to Porto

Popular in	July
Cheapest in	February
Round-trip from	$523
One-way from	$477

High demand for flights, 51% potential price rise

Search Deals

Best time to find cheap flights, 47% potential price drop

Search Deals

From Lambert-St Louis to Porto

Search Deals

One-way flight from Lambert-St Louis to Porto

Search Deals

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 68% on your flight compared to booking on days when demand is much higher.

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

Flights from St. Louis to Porto lean towards being more expensive in July. Prices are generally better when you fly from St. Louis to Porto in February, with the cheapest ticket starting at $614.

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 26% on flights from St. Louis to Porto by exploring options for tickets at noon.

Cheap United Airlines flights from St. Louis to Porto

Consider these cheap United Airlines flights we've found departing from St. Louis to Porto. It's recommended that users confirm their flight details before booking.

Sat 8/314:51 pmSTL - OPO

2 stops40h 54mUnited Airlines

Sat 9/76:00 amOPO - STL

2 stops39h 49mUnited Airlines

Deal found 4/18$1,115

Sat 8/315:32 pmSTL - OPO

1 stop10h 13mUnited Airlines

Sat 9/76:00 amOPO - STL

2 stops22h 13mUnited Airlines

Deal found 4/18$1,117

Wed 5/295:25 pmSTL - OPO

1 stop10h 20mUnited Airlines

Wed 6/59:00 amOPO - STL

1 stop12h 58mUnited Airlines

Deal found 4/18$1,148

Wed 5/295:25 pmSTL - OPO

1 stop10h 20mUnited Airlines

Sat 6/89:00 amOPO - STL

1 stop12h 58mUnited Airlines

Deal found 4/18$1,248

Thu 5/305:25 pmSTL - OPO

1 stop10h 20mUnited Airlines

Sat 6/89:00 amOPO - STL

1 stop12h 58mUnited Airlines

Deal found 4/18$1,348

Sat 5/115:34 pmSTL - OPO

1 stop10h 11mUnited Airlines

Fri 5/249:00 amOPO - STL

1 stop12h 58mUnited Airlines

Deal found 4/19$1,433

Mon 5/205:35 pmSTL - OPO

1 stop10h 10mUnited Airlines

Mon 6/39:00 amOPO - STL

1 stop12h 58mUnited Airlines

Deal found 4/19$8,788

Mon 5/205:35 pmSTL - OPO

1 stop10h 10mUnited Airlines

Sat 6/19:00 amOPO - STL

1 stop12h 58mUnited Airlines

Deal found 4/19$9,573

Cheap Delta flights from St. Louis to Porto

Browse through some of the cheapest Delta flights traveling from St. Louis to Porto. Check back soon if you're not seeing flights that suit your needs.

Mon 5/137:10 pmSTL - OPO

2 stops14h 30mDelta

Fri 5/249:15 amOPO - STL

2 stops20h 25mDelta

Deal found 4/19$1,139

Mon 5/135:02 pmSTL - OPO

2 stops16h 38mDelta

Tue 5/215:00 amOPO - STL

2 stops22h 52mDelta

Deal found 4/19$1,142

Mon 5/202:55 pmSTL - OPO

2 stops18h 35mDelta

Sun 6/25:00 amOPO - STL

2 stops17h 49mDelta

Deal found 4/19$1,229

Sun 5/1210:25 amSTL - OPO

2 stops18h 15mDelta

Fri 5/249:15 amOPO - STL

2 stops17h 35mDelta

Deal found 4/19$1,254

Sun 5/1210:25 amSTL - OPO

2 stops18h 15mDelta

Mon 5/2011:25 amOPO - STL

2 stops31h 43mDelta

Deal found 4/19$1,257

Fri 5/1012:59 pmSTL - OPO

2 stops20h 31mDelta

Fri 5/249:15 amOPO - STL

2 stops17h 35mDelta

Deal found 4/19$1,292

Fri 5/1012:59 pmSTL - OPO

2 stops20h 31mDelta

Wed 5/225:00 amOPO - STL

2 stops22h 52mDelta

Deal found 4/19$1,294

Thu 5/910:45 amSTL - OPO

2 stops17h 55mDelta

Fri 5/249:15 amOPO - STL

2 stops17h 10mDelta

Deal found 4/19$1,304

Thu 5/95:02 pmSTL - OPO

2 stops16h 38mDelta

Mon 5/2011:25 amOPO - STL

2 stops31h 43mDelta

Deal found 4/19$1,307

Cheap St. Louis to Porto flights in April & May 2024

Scroll through some of the best deals on flights from St. Louis to Porto in 2024. Check back regularly for other flight deals.

Mon 5/137:10 pmSTL - OPO

2 stops14h 30mDelta

Fri 5/249:15 amOPO - STL

2 stops20h 25mDelta

Deal found 4/19$1,139

Mon 5/137:10 pmSTL - OPO

2 stops14h 30mDelta

Mon 5/2011:25 amOPO - STL

2 stops31h 43mDelta

Deal found 4/19$1,142

Wed 5/296:08 amSTL - OPO

1 stop18h 47mMultiple Airlines

Wed 6/56:00 amOPO - STL

2 stops21h 05mMultiple Airlines

Deal found 4/18$1,147

Wed 5/295:25 pmSTL - OPO

1 stop10h 20mUnited Airlines

Wed 6/59:00 amOPO - STL

1 stop12h 58mUnited Airlines

Deal found 4/18$1,148

Wed 5/298:55 amSTL - OPO

2 stops16h 00mMultiple Airlines

Wed 6/56:00 amOPO - STL

2 stops21h 05mMultiple Airlines

Deal found 4/18$1,151

Mon 5/202:55 pmSTL - OPO

2 stops18h 35mDelta

Sun 6/25:00 amOPO - STL

2 stops17h 49mDelta

Deal found 4/19$1,229

Wed 5/296:08 amSTL - OPO

1 stop18h 47mMultiple Airlines

Sat 6/88:40 amOPO - STL

2 stops17h 21mMultiple Airlines

Deal found 4/18$1,247

Wed 5/295:25 pmSTL - OPO

1 stop10h 20mUnited Airlines

Sat 6/89:00 amOPO - STL

1 stop12h 58mUnited Airlines

Deal found 4/18$1,248

Sun 5/1210:25 amSTL - OPO

2 stops18h 15mDelta

Fri 5/249:15 amOPO - STL

2 stops17h 35mDelta

Deal found 4/19$1,254

St. Louis to Porto 2024 flight deals

Scroll through some of the best deals on flights from St. Louis to Porto in 2024. Check back regularly for other flight deals.

Wed 11/134:10 pmSTL - OPO

2 stops20h 30mAir Canada

Wed 11/206:00 amOPO - STL

2 stops33h 53mAir Canada

Deal found 4/19$556

Tue 11/1210:40 amSTL - OPO

2 stops18h 55mMultiple Airlines

Tue 11/196:00 amOPO - STL

2 stops33h 53mMultiple Airlines

Deal found 4/19$558

Tue 11/121:27 pmSTL - OPO

2 stops20h 18mUnited Airlines

Wed 11/206:00 amOPO - STL

1 stop13h 55mUnited Airlines

Deal found 4/19$561

Tue 11/122:54 pmSTL - OPO

2 stops19h 51mMultiple Airlines

Mon 11/188:40 pmOPO - STL

2 stops31h 56mMultiple Airlines

Deal found 4/19$567

Wed 11/1311:58 amSTL - OPO

2 stops22h 07mMultiple Airlines

Mon 11/188:40 pmOPO - STL

2 stops31h 56mMultiple Airlines

Deal found 4/19$570

Tue 11/128:25 amSTL - OPO

2 stops21h 10mUnited Airlines

Tue 11/1912:30 pmOPO - STL

1 stop31h 25mUnited Airlines

Deal found 4/19$578

Wed 11/134:10 pmSTL - OPO

2 stops20h 30mMultiple Airlines

Sat 11/236:00 amOPO - STL

2 stops33h 53mMultiple Airlines

Deal found 4/19$606

Fri 11/153:55 pmSTL - OPO

1 stop13h 40mLufthansa

Wed 11/206:00 amOPO - STL

1 stop13h 55mLufthansa

Deal found 4/19$607

Thu 11/1410:40 amSTL - OPO

2 stops23h 05mMultiple Airlines

Thu 11/216:00 amOPO - STL

2 stops39h 23mMultiple Airlines

Deal found 4/19$608

One-way flights to Porto from St. Louis

Take a look at some of the one-way flights we've detected from St. Louis to Porto. Users in need of a round-trip flight from St. Louis to Porto instead should update the search form at the top of page.

Sun 5/267:30 pmSTL - OPO

3 stops53h 55mMultiple Airlines

Deal found 4/19$477

Sun 5/267:30 pmSTL - OPO

2 stops58h 50mMultiple Airlines

Deal found 4/19$511

Sun 5/265:25 pmSTL - OPO

1 stop10h 20mUnited Airlines

Deal found 4/19$1,304

Find flights from St. Louis to Porto within your budget

Fly from

Fly to

Budget

$892 - $1,841

Route

Depart

Return

Price

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 7/17

2 stops19h 10m

Porto

Tue 9/17

2 stops20h 00m

$892

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 7/17

2 stops34h 55m

Porto

Mon 9/16

2 stops22h 56m

$1,071

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 9/9

2 stops18h 05m

Porto

Sat 9/21

2 stops28h 20m

$1,076

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sat 8/31

2 stops40h 54m

Porto

Sat 9/7

2 stops39h 49m

$1,115

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sat 8/31

1 stop10h 13m

Porto

Sat 9/7

2 stops22h 13m

$1,117

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 5/13

2 stops14h 30m

Porto

Fri 5/24

2 stops20h 25m

$1,139

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 5/13

2 stops16h 38m

Porto

Tue 5/21

2 stops22h 52m

$1,142

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 5/29

1 stop18h 47m

Porto

Wed 6/5

2 stops21h 05m

$1,147

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 10/8

2 stops24h 03m

Porto

Wed 10/23

2 stops37h 51m

$1,841

Flights are sorted by cheapest first

Deals found on 4/19

When is the cheapest time to fly from St. Louis to Porto?

Morning

Noon

Afternoon

Evening

All times are departure.

Travelers seeking maximum savings on their St. Louis to Porto flight should consider departing on Tuesday mornings when fares are most often at their lowest. Thursday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Search Deals

Average price of flights to Porto by month

Currently, January is the cheapest month in which you can book a flight from St. Louis to Porto (average of $523). Flying from St. Louis to Porto in June is currently the most expensive (average of $1,027). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

January

$523

February

$581

March

$599

April

$728

May

$888

June

$1,027

July

$974

August

$870

September

$765

October

$695

November

$551

December

$645

Temperature and rainfall in Porto by month

OPO Temperature	48.2 - 68 °F

OPO

Temperature

48.2 - 68 °F

Reviews of airlines servicing Porto

Read through reviews of airlines operating flights from St. Louis to Porto, such as United Airlines, Delta and Lufthansa. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.1

Very good

11,094 reviews

Check prices

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Delta

8.1

Very good

11,094 reviews

Delta

8.1

Very good

11,094 reviews

Check prices

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

United Airlines

7.4

Good

11,325 reviews

Delta

8.1

Very good

11,094 reviews

Check prices

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

American Airlines

7.3

Good

14,955 reviews

Delta

8.1

Very good

11,094 reviews

Check prices

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Air Canada

7.0

Good

6,844 reviews

Delta

8.1

Very good

11,094 reviews

Check prices

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Lufthansa

7.0

Good

7,794 reviews

Delta

8.1

Very good

11,094 reviews

Check prices

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Related info for your journey

Can I find flights from St. Louis to Porto for under $900 on Cheapflights?
Yes, there are multiple flights from St. Louis to Porto for under $900. The cheapest flight booked recently is on Air Canada for just $892, but on average you can expect to pay $1,178.
What are the cheapest airlines flying from St. Louis to Porto round-trip?
Air Canada, at $892, was found to be the cheapest airline from St. Louis to Porto.Alternate airlines to your destination round-trip include Lufthansa and United Airlines. Users have found that Air Canada is 24% cheaper than the other options available to this destination.
What does STL to OPO mean?
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Lambert-St Louis Airport to Porto Airport flight would often be abbreviated as a STL to OPO flight.
Can I find deals for flights from St. Louis to Porto that include extra baggage allowance?
The amount of baggage you can bring on your St. Louis to Porto flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.
Can I find deals on flights from St. Louis to Porto with specific airlines?
Yes, Cheapflights allows you to browse and filter St. Louis to Porto flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.
Can I find deals for flights from St. Louis to Porto that include hotel bookings?
Yes. In addition to deals on St. Louis to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Porto?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Porto.
Can I find deals for business class flights from St. Louis to Porto?
Yes. Cheapflights offers flight deals from St. Louis to Porto by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
Can I find deals for flights from St. Louis to Porto that allow pets onboard?
Many airlines flying from St. Louis to Porto offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.
Can I find deals on last-minute flights from St. Louis to Porto?
Yes, you can often find last-minute deals on St. Louis to Porto flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.
How recently were the St. Louis to Porto flight deals updated?
The St. Louis to Porto flight deals you see on this page were last updated on 4/19.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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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Top 2 airlines flying from St. Louis to Porto

Airline	Cheapest	Average	Flexibility	On-time
Iberia	Cheapest$623	Average$1,308	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
United Airlines	Cheapest$752	Average$1,231	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

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How does Cheapflights help users find flights from St. Louis to Porto?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from St. Louis to Porto. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Porto?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Porto from St. Louis.

Can Cheapflights find flights from St. Louis to Porto with no change fees?

Need flexible booking options for your flight to Porto from St. Louis? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from St. Louis to Porto become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Porto from St. Louis today and book when prices fit your budget.

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Cheap flights from St. Louis (STL) to Porto (OPO) from $477

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/26. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.

Cheap flight deals from St. Louis to Porto

Popular in

Cheapest in

Round-trip from

One-way from

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

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

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

Cheap United Airlines flights from St. Louis to Porto

Consider these cheap United Airlines flights we've found departing from St. Louis to Porto. It's recommended that users confirm their flight details before booking.

Cheap Delta flights from St. Louis to Porto

Browse through some of the cheapest Delta flights traveling from St. Louis to Porto. Check back soon if you're not seeing flights that suit your needs.

Cheap St. Louis to Porto flights in April & May 2024

Find cheap flight options from St. Louis to Porto specifically for the months of April and May 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,138,949 searches. Prices were last updated on April 19, 2024.

Scroll through some of the best deals on flights from St. Louis to Porto in 2024. Check back regularly for other flight deals.

St. Louis to Porto 2024 flight deals

Discover exclusive flight deals for travel between St. Louis and Porto in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,138,949 searches. Data last updated April 19, 2024.

Scroll through some of the best deals on flights from St. Louis to Porto in 2024. Check back regularly for other flight deals.

One-way flights to Porto from St. Louis

Take a look at some of the one-way flights we've detected from St. Louis to Porto. Users in need of a round-trip flight from St. Louis to Porto instead should update the search form at the top of page.

Find flights from St. Louis to Porto within your budget

When is the cheapest time to fly from St. Louis to Porto?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Porto. Price data was last updated on April 14, 2024.

Average price of flights to Porto by month

Plan your trip from St. Louis to Porto by taking into account the cheapest months to travel. The average price of a one-way flight from St. Louis to Porto is currently $764 while a round-trip flight costs $1,171. Price data was last updated on April 14, 2024.

Temperature and rainfall in Porto by month

Plan your trip to Porto by taking into account the average temperature and rainfall totals by month.

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Porto. Reviews last updated April 19, 2024.

Read through reviews of airlines operating flights from St. Louis to Porto, such as United Airlines, Delta and Lufthansa. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

Can I find flights from St. Louis to Porto for under $900 on Cheapflights?

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

What does STL to OPO mean?

Can I find deals for flights from St. Louis to Porto that include extra baggage allowance?

Can I find deals on flights from St. Louis to Porto with specific airlines?

Can I find deals for flights from St. Louis to Porto that include hotel bookings?

How can I find direct flights from St. Louis to Porto?

Can I find deals for business class flights from St. Louis to Porto?

Can I find deals for flights from St. Louis to Porto that allow pets onboard?

Can I find deals on last-minute flights from St. Louis to Porto?

How recently were the St. Louis to Porto flight deals updated?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to PortoSee prices for flight routes from nearby airports that may be better suited for you.

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

Top 2 airlines flying from St. Louis to Porto

Popular flight searches

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Search flights from St. Louis to Porto by cabin class

Find flights from St. Louis to Porto, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations

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Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from St. Louis to Porto?

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Porto?

Can Cheapflights find flights from St. Louis to Porto with no change fees?

Can Cheapflights notify me if prices for flights from St. Louis to Porto become cheaper?

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Alternative routes for St. Louis to Porto
See prices for flight routes from nearby airports that may be better suited for you.