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Cheap flights from St. Louis (STL) to Porto (OPO) from $513

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 7/24. 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.
STL — OPO
Jun 7 — Jun 141
From?
To?
Fri 6/7
Fri 6/14
1 adult, Economy
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Cheap flight deals from St. Louis to Porto

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Porto (OPO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 2, 2024.

Popular in

June

Cheapest in

February

Average price

$1,619

Round-trip from

$523
High demand for flights, 33% potential price rise
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Best time to find cheap flights, 42% potential price drop
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Average for round-trip flights in June 2024
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From Lambert-St Louis to Porto
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What is the cheapest day to fly round-trip from St. Louis to Porto?

Users have found that leaving on a Monday can be a cost-effective option. It’s possible to save up to 47% 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 June. Prices are generally better when you fly from St. Louis to Porto in February, with the cheapest ticket starting at $615.

What is the cheapest time of day to fly from STL to OPO?

Unlike in the afternoon, when flights are generally more expensive, you can save up to 25% on flights from St. Louis to Porto by exploring options for tickets at noon.

Cheap Lufthansa flights from St. Louis to Porto

Explore cheap flight options specifically provided by Lufthansa for the route between St. Louis and Porto. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,807,690 searches. Data last updated June 2, 2024.
Consider these cheap Lufthansa flights we've found departing from St. Louis to Porto. It's recommended that users confirm their flight details before booking.
Tue 9/248:25 amSTL - OPO
2 stops32h 55mLufthansa
Sun 9/294:35 pmOPO - STL
2 stops29h 24mLufthansa
Deal found 6/2$974
Tue 9/105:18 pmSTL - OPO
2 stops24h 02mLufthansa
Sat 9/2112:10 pmOPO - STL
1 stop31h 20mLufthansa
Deal found 6/2$1,086
Tue 9/248:25 amSTL - OPO
2 stops32h 55mLufthansa
Sun 9/296:00 amOPO - STL
1 stop13h 30mLufthansa
Deal found 6/2$1,202
Mon 9/95:20 pmSTL - OPO
2 stops47h 30mLufthansa
Sat 9/2112:10 pmOPO - STL
1 stop31h 20mLufthansa
Deal found 6/2$1,250
Fri 9/63:25 pmSTL - OPO
1 stop13h 55mLufthansa
Fri 9/206:00 amOPO - STL
1 stop13h 30mLufthansa
Deal found 6/2$1,277
Sat 9/712:55 pmSTL - OPO
2 stops16h 25mLufthansa
Fri 9/206:00 amOPO - STL
1 stop13h 30mLufthansa
Deal found 6/2$1,281
Sun 9/83:25 pmSTL - OPO
1 stop13h 55mLufthansa
Fri 9/206:00 amOPO - STL
1 stop13h 30mLufthansa
Deal found 6/2$1,352
Fri 9/63:25 pmSTL - OPO
1 stop13h 55mLufthansa
Sat 9/216:00 amOPO - STL
2 stops15h 49mLufthansa
Deal found 6/2$1,378
Sun 9/812:15 pmSTL - OPO
2 stops16h 40mLufthansa
Fri 9/206:00 amOPO - STL
1 stop13h 30mLufthansa
Deal found 6/2$1,397

Cheap Delta flights from St. Louis to Porto

Explore cheap flight options specifically provided by Delta for the route between St. Louis and Porto. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,807,690 searches. Data last updated June 2, 2024.
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.
Sun 9/83:28 pmSTL - OPO
2 stops18h 02mDelta
Fri 9/209:15 amOPO - STL
2 stops18h 42mDelta
Deal found 6/2$886
Mon 9/93:55 pmSTL - OPO
2 stops34h 30mDelta
Fri 9/209:15 amOPO - STL
2 stops20h 24mDelta
Deal found 6/2$887
Fri 9/64:00 pmSTL - OPO
2 stops17h 30mDelta
Fri 9/209:15 amOPO - STL
2 stops17h 22mDelta
Deal found 6/2$936
Sun 9/83:28 pmSTL - OPO
2 stops18h 02mDelta
Sat 9/216:30 amOPO - STL
2 stops20h 51mDelta
Deal found 6/2$938
Mon 9/912:49 pmSTL - OPO
2 stops37h 36mDelta
Sat 9/216:30 amOPO - STL
2 stops20h 51mDelta
Deal found 6/2$940
Fri 9/64:00 pmSTL - OPO
2 stops17h 30mDelta
Sat 9/216:30 amOPO - STL
2 stops20h 51mDelta
Deal found 6/2$988
Thu 9/123:55 pmSTL - OPO
2 stops17h 35mDelta
Fri 9/209:15 amOPO - STL
2 stops20h 24mDelta
Deal found 6/2$1,036
Tue 9/1011:15 amSTL - OPO
2 stops22h 15mDelta
Sun 9/225:00 amOPO - STL
2 stops22h 57mDelta
Deal found 6/2$1,056
Thu 9/122:17 pmSTL - OPO
2 stops19h 13mDelta
Sat 9/216:30 amOPO - STL
2 stops20h 51mDelta
Deal found 6/1$1,088

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 2,807,690 searches. Data last updated June 2, 2024.
Scroll through some of the best deals on flights from St. Louis to Porto in 2024. Check back regularly for other flight deals.
Wed 9/118:25 amSTL - OPO
2 stops32h 55mMultiple Airlines
Fri 9/208:40 amOPO - STL
2 stops17h 20mMultiple Airlines
Deal found 6/1$870
Sun 9/83:28 pmSTL - OPO
2 stops18h 02mDelta
Fri 9/209:15 amOPO - STL
2 stops18h 42mDelta
Deal found 6/2$886
Mon 9/93:55 pmSTL - OPO
2 stops34h 30mDelta
Fri 9/209:15 amOPO - STL
2 stops20h 24mDelta
Deal found 6/2$887
Sat 9/74:05 pmSTL - OPO
2 stops20h 25mAir Canada
Fri 9/208:40 amOPO - STL
2 stops17h 20mAir Canada
Deal found 6/2$919
Tue 9/101:31 pmSTL - OPO
2 stops24h 24mAmerican Airlines
Sat 9/218:15 amOPO - STL
2 stops30h 45mAmerican Airlines
Deal found 6/2$924
Mon 9/96:22 pmSTL - OPO
3 stops31h 13mAmerican Airlines
Sat 9/218:15 amOPO - STL
2 stops30h 45mAmerican Airlines
Deal found 6/2$929
Mon 9/96:51 pmSTL - OPO
2 stops30h 44mAmerican Airlines
Sat 9/218:15 amOPO - STL
2 stops30h 45mAmerican Airlines
Deal found 6/2$931
Fri 9/64:00 pmSTL - OPO
2 stops17h 30mDelta
Fri 9/209:15 amOPO - STL
2 stops20h 24mDelta
Deal found 6/2$936
Sun 9/83:28 pmSTL - OPO
2 stops18h 02mDelta
Sat 9/2111:25 amOPO - STL
2 stops32h 00mDelta
Deal found 6/2$938

One-way flights to Porto from St. Louis

Search for one-way flight options from St. Louis to Porto. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,807,690 searches. Data last updated June 2, 2024.
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.
Wed 7/2410:32 pmSTL - OPO
2 stops42h 38mMultiple Airlines
Deal found 6/2$513
Wed 7/37:29 pmSTL - OPO
3 stops55h 21mMultiple Airlines
Deal found 6/2$541
Mon 10/712:00 pmSTL - OPO
3 stops20h 20mMultiple Airlines
Deal found 6/2$552
Mon 10/712:00 pmSTL - OPO
2 stops17h 30mMultiple Airlines
Deal found 6/2$563
Wed 7/37:29 pmSTL - OPO
2 stops41h 36mMultiple Airlines
Deal found 6/2$599
Wed 7/2410:59 pmSTL - OPO
3 stops42h 11mMultiple Airlines
Deal found 6/2$620
Mon 10/712:00 pmSTL - OPO
1 stop13h 00mMultiple Airlines
Deal found 6/2$672
Sat 6/84:05 pmSTL - OPO
2 stops18h 05mMultiple Airlines
Deal found 6/2$744
Sat 6/811:38 amSTL - OPO
3 stops22h 32mMultiple Airlines
Deal found 6/2$745

Find flights from St. Louis to Porto within your budget

Customize your flight search to find flights from St. Louis to Porto that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,807,690 searches. Data last updated June 2, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$870 - $1,283

Route

Depart

Return

Price

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 9/11

2 stops32h 55m

Porto

Fri 9/20

2 stops17h 20m

$870

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sun 9/8

2 stops18h 02m

Porto

Fri 9/20

2 stops18h 42m

$886

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 9/9

2 stops34h 30m

Porto

Fri 9/20

2 stops20h 24m

$887

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Sat 9/7

2 stops20h 25m

Porto

Fri 9/20

2 stops17h 20m

$919

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 9/10

2 stops24h 24m

Porto

Sat 9/21

2 stops30h 45m

$924

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 9/9

3 stops31h 13m

Porto

Sat 9/21

2 stops30h 45m

$929

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 9/24

2 stops32h 55m

Porto

Sun 9/29

2 stops29h 24m

$974

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 9/9

2 stops31h 05m

Porto

Sun 9/22

2 stops15h 09m

$1,072

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 8/7

3 stops31h 25m

Porto

Mon 8/12

2 stops33h 30m

$1,283

Flights are sorted by cheapest first

Deals found on 6/1

What is the cheapest day 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 June 2, 2024.
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. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Best time to book a flight from St. Louis to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Temperature and rainfall in Porto by month

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

OPO

Temperature

48.2 - 68 °F

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 June 2, 2024.
Read through reviews of airlines operating flights from St. Louis to Porto, such as Lufthansa, Delta and Air Canada. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
10,402 reviews
Check prices

Overall

8.0

Comfort

7.9

Food

7.4

Crew

8.6

Boarding

8.2

Entertainment

8.0

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Delta
8.0
Very good
10,402 reviews
Delta
8.0
Very good
10,402 reviews
Check prices

Overall

8.0

Comfort

7.9

Food

7.4

Crew

8.6

Boarding

8.2

Entertainment

8.0

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

United Airlines
7.4
Good
10,755 reviews
Delta
8.0
Very good
10,402 reviews
Check prices

Overall

8.0

Comfort

7.9

Food

7.4

Crew

8.6

Boarding

8.2

Entertainment

8.0

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

American Airlines
7.3
Good
14,260 reviews
Delta
8.0
Very good
10,402 reviews
Check prices

Overall

8.0

Comfort

7.9

Food

7.4

Crew

8.6

Boarding

8.2

Entertainment

8.0

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Iberia
7.1
Good
2,731 reviews
Delta
8.0
Very good
10,402 reviews
Check prices

Overall

8.0

Comfort

7.9

Food

7.4

Crew

8.6

Boarding

8.2

Entertainment

8.0

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Air Canada
7.0
Good
7,021 reviews
Delta
8.0
Very good
10,402 reviews
Check prices

Overall

8.0

Comfort

7.9

Food

7.4

Crew

8.6

Boarding

8.2

Entertainment

8.0

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

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?

    Yes, there are multiple flights from St. Louis to Porto for under $900. The cheapest flight booked recently is on Multiple Airlines for just $870, but on average you can expect to pay $984.

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

    Delta, at $886, was found to be the cheapest airline from St. Louis to Porto.Alternate airlines to your destination round-trip include Air Canada and American Airlines. Users have found that Delta is 18% 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 6/2.

  • What is the cheapest month to book a flight from St. Louis to Porto?

    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 $994). 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.

See more FAQs

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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.

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Top 2 airlines flying from St. Louis to Porto

Discover the top 2 airlines that operate flights from St. Louis to Porto. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,807,690 searches. Data last updated June 2, 2024.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$624Average$1,001FlexibilityNo cancel feeOn-time77%
Search Iberia flights
United AirlinesCheapest$752Average$1,231FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
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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.
First Class
Business Class
Prem Econ Class
Economy Class

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Fly with Cheapflights

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?

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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