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Cheap flights from St. Louis (STL) to Porto (OPO) from $529

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 7/20. 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
May 21 — May 281
From?
To?
Tue 5/21
Tue 5/28
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 May 16, 2024.

Popular in

June

Cheapest in

February

Average price

$1,493

Round-trip from

$523
High demand for flights, 32% potential price rise
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Best time to find cheap flights, 43% potential price drop
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Average for round-trip flights in May 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 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 June. Prices are generally better when you fly from St. Louis to Porto in February, with the cheapest ticket starting at $615.

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 25% on flights from St. Louis to Porto by exploring options for tickets at noon.

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 2,637,452 searches. Data last updated May 16, 2024.
Consider these cheap Delta flights we've found departing from St. Louis to Porto. It's recommended that users confirm their flight details before booking.
Tue 10/12:05 pmSTL - OPO
2 stops19h 25mDelta
Tue 10/156:45 amOPO - STL
2 stops19h 46mDelta
Deal found 5/15$940
Mon 7/2911:23 amSTL - OPO
2 stops22h 07mDelta
Wed 8/146:30 amOPO - STL
2 stops20h 02mDelta
Deal found 5/15$966
Mon 9/97:15 pmSTL - OPO
2 stops33h 25mDelta
Fri 9/209:15 amOPO - STL
2 stops20h 20mDelta
Deal found 5/14$976
Sun 9/82:05 pmSTL - OPO
2 stops19h 25mDelta
Sat 9/2111:25 amOPO - STL
2 stops31h 43mDelta
Deal found 5/14$1,000
Fri 9/65:30 pmSTL - OPO
2 stops16h 00mDelta
Fri 9/209:15 amOPO - STL
2 stops20h 20mDelta
Deal found 5/14$1,014
Thu 9/125:05 pmSTL - OPO
2 stops16h 35mDelta
Fri 9/209:15 amOPO - STL
2 stops17h 24mDelta
Deal found 5/14$1,026
Fri 9/65:30 pmSTL - OPO
2 stops16h 00mDelta
Sat 9/216:30 amOPO - STL
2 stops21h 01mDelta
Deal found 5/14$1,050
Mon 6/33:05 pmSTL - OPO
2 stops18h 35mDelta
Wed 8/76:30 amOPO - STL
2 stops20h 02mDelta
Deal found 5/15$1,056
Sun 9/82:05 pmSTL - OPO
2 stops19h 25mDelta
Sun 9/225:00 amOPO - STL
2 stops15h 30mDelta
Deal found 5/14$1,077

Cheap United Airlines flights from St. Louis to Porto

Explore cheap flight options specifically provided by United Airlines 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 2,637,452 searches. Data last updated May 16, 2024.
Browse through some of the cheapest United Airlines flights traveling from St. Louis to Porto. Check back soon if you're not seeing flights that suit your needs.
Tue 10/18:50 amSTL - OPO
2 stops18h 55mUnited Airlines
Tue 10/1512:15 pmOPO - STL
1 stop31h 15mUnited Airlines
Deal found 5/15$959
Tue 10/15:30 pmSTL - OPO
1 stop10h 15mUnited Airlines
Tue 10/1512:15 pmOPO - STL
1 stop31h 15mUnited Airlines
Deal found 5/15$980
Wed 6/1210:15 amSTL - OPO
2 stops19h 05mUnited Airlines
Wed 6/199:00 amOPO - STL
1 stop12h 58mUnited Airlines
Deal found 5/15$1,065
Fri 6/143:25 pmSTL - OPO
1 stop13h 55mUnited Airlines
Fri 6/219:00 amOPO - STL
2 stops17h 25mUnited Airlines
Deal found 5/16$1,116
Sun 6/26:15 amSTL - OPO
2 stops21h 30mUnited Airlines
Fri 6/79:00 amOPO - STL
1 stop12h 58mUnited Airlines
Deal found 5/15$1,122
Fri 6/146:30 amSTL - OPO
2 stops18h 25mUnited Airlines
Fri 6/219:00 amOPO - STL
2 stops19h 15mUnited Airlines
Deal found 5/16$1,166
Mon 7/2910:19 amSTL - OPO
2 stops17h 26mUnited Airlines
Wed 8/146:00 amOPO - STL
3 stops22h 17mUnited Airlines
Deal found 5/15$1,274
Tue 9/105:32 pmSTL - OPO
1 stop10h 13mUnited Airlines
Sun 9/156:00 amOPO - STL
1 stop13h 30mUnited Airlines
Deal found 5/15$1,292
Sun 6/25:25 pmSTL - OPO
1 stop10h 20mUnited Airlines
Fri 6/79:00 amOPO - STL
1 stop12h 58mUnited Airlines
Deal found 5/15$1,593

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

Find cheap flight options from St. Louis to Porto specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,637,452 searches. Prices were last updated on May 16, 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 6/33:05 pmSTL - OPO
2 stops18h 35mDelta
Wed 8/76:30 amOPO - STL
2 stops20h 02mDelta
Deal found 5/15$1,056
Wed 6/1211:00 amSTL - OPO
2 stops18h 20mMultiple Airlines
Wed 6/196:15 amOPO - STL
2 stops39h 06mMultiple Airlines
Deal found 5/15$1,063
Wed 6/1210:15 amSTL - OPO
2 stops19h 05mUnited Airlines
Wed 6/199:00 amOPO - STL
1 stop12h 58mUnited Airlines
Deal found 5/15$1,065
Sun 6/26:15 amSTL - OPO
2 stops21h 30mUnited Airlines
Fri 6/79:00 amOPO - STL
1 stop12h 58mUnited Airlines
Deal found 5/15$1,122
Wed 6/126:08 amSTL - OPO
1 stop21h 37mMultiple Airlines
Wed 6/196:00 amOPO - STL
1 stop13h 30mMultiple Airlines
Deal found 5/15$1,201
Mon 5/209:50 amSTL - OPO
2 stops19h 35mMultiple Airlines
Wed 8/73:40 pmOPO - STL
2 stops34h 21mMultiple Airlines
Deal found 5/15$1,204
Mon 6/310:15 amSTL - OPO
3 stops25h 30mMultiple Airlines
Wed 8/73:40 pmOPO - STL
2 stops34h 21mMultiple Airlines
Deal found 5/15$1,236
Mon 5/209:50 amSTL - OPO
2 stops19h 35mMultiple Airlines
Wed 8/710:00 amOPO - STL
3 stops35h 21mMultiple Airlines
Deal found 5/15$1,253
Wed 5/2210:20 amSTL - OPO
2 stops18h 20mDelta
Fri 8/309:15 amOPO - STL
2 stops18h 14mDelta
Deal found 5/15$1,258

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 2,637,452 searches. Data last updated May 16, 2024.
Scroll through some of the best deals on flights from St. Louis to Porto in 2024. Check back regularly for other flight deals.
Thu 11/281:00 pmSTL - OPO
2 stops16h 35mUnited Airlines
Mon 12/212:30 pmOPO - STL
2 stops31h 48mUnited Airlines
Deal found 5/15$699
Thu 11/284:10 pmSTL - OPO
2 stops20h 30mAir Canada
Mon 12/26:00 amOPO - STL
2 stops33h 53mAir Canada
Deal found 5/14$739
Tue 9/1010:34 amSTL - OPO
2 stops30h 51mMultiple Airlines
Sun 9/1510:55 amOPO - STL
3 stops41h 19mMultiple Airlines
Deal found 5/15$901
Tue 9/1010:34 amSTL - OPO
3 stops30h 01mMultiple Airlines
Sun 9/1510:55 amOPO - STL
3 stops41h 19mMultiple Airlines
Deal found 5/15$929
Mon 9/912:00 pmSTL - OPO
2 stops17h 20mMultiple Airlines
Fri 9/208:40 amOPO - STL
2 stops36h 40mMultiple Airlines
Deal found 5/14$932
Sun 9/84:05 pmSTL - OPO
2 stops20h 10mMultiple Airlines
Fri 9/208:40 amOPO - STL
2 stops36h 40mMultiple Airlines
Deal found 5/14$938
Tue 10/12:05 pmSTL - OPO
2 stops19h 25mDelta
Tue 10/156:45 amOPO - STL
2 stops19h 46mDelta
Deal found 5/15$940
Tue 10/18:50 amSTL - OPO
2 stops18h 55mUnited Airlines
Tue 10/1512:15 pmOPO - STL
1 stop31h 15mUnited Airlines
Deal found 5/15$959
Mon 7/2911:23 amSTL - OPO
2 stops22h 07mDelta
Wed 8/146:30 amOPO - STL
2 stops20h 02mDelta
Deal found 5/15$966

St. Louis to Porto flights leaving soon

Find last-minute flight options from St. Louis to Porto for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Book one of these great deals on flights from St. Louis to Porto. Users should be sure to double check the price, date, and time of their last-minute flight.
Wed 5/2210:20 amSTL - OPO
2 stops18h 20mDelta
Fri 8/309:15 amOPO - STL
2 stops18h 14mDelta
Deal found 5/15$1,258
Wed 5/2211:00 amSTL - OPO
2 stops25h 30mMultiple Airlines
Fri 8/3011:00 amOPO - STL
3 stops34h 21mMultiple Airlines
Deal found 5/15$1,395
Wed 5/228:27 amSTL - OPO
2 stops25h 08mLufthansa
Fri 8/306:00 amOPO - STL
1 stop13h 30mLufthansa
Deal found 5/15$1,653
Wed 5/225:35 pmSTL - OPO
1 stop31h 20mMultiple Airlines
Fri 8/306:00 amOPO - STL
1 stop13h 30mMultiple Airlines
Deal found 5/15$1,694
Wed 5/2210:10 amSTL - OPO
3 stops19h 20mMultiple Airlines
Fri 8/303:55 pmOPO - STL
3 stops29h 26mMultiple Airlines
Deal found 5/15$1,800

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 2,637,452 searches. Data last updated May 16, 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.
Sat 7/2010:19 amSTL - OPO
2 stops14h 36mUnited Airlines
Deal found 5/16$529
Wed 7/243:25 pmSTL - OPO
1 stop18h 10mLufthansa
Deal found 5/16$898
Sat 7/206:09 pmSTL - OPO
3 stops31h 56mMultiple Airlines
Deal found 5/16$1,543
Wed 7/246:09 pmSTL - OPO
3 stops22h 16mMultiple Airlines
Deal found 5/16$2,209

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 2,637,452 searches. Data last updated May 16, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$901 - $1,259

Route

Depart

Return

Price

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 9/10

2 stops30h 51m

Porto

Sun 9/15

3 stops41h 19m

$901

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 9/10

3 stops30h 01m

Porto

Sun 9/15

3 stops41h 19m

$929

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 10/1

2 stops19h 25m

Porto

Tue 10/15

2 stops19h 46m

$940

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 10/1

2 stops18h 55m

Porto

Tue 10/15

1 stop31h 15m

$959

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 7/29

2 stops22h 07m

Porto

Wed 8/14

2 stops20h 02m

$966

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 9/11

2 stops17h 25m

Porto

Sat 9/21

2 stops19h 45m

$985

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 9/10

2 stops23h 32m

Porto

Fri 9/20

1 stop13h 30m

$1,004

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 9/9

2 stops33h 15m

Porto

Sat 9/21

2 stops17h 43m

$1,025

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 9/9

3 stops30h 37m

Porto

Sat 9/21

2 stops20h 45m

$1,259

Flights are sorted by cheapest first

Deals found on 5/15

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 May 12, 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. 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

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 $1,295 while a round-trip flight costs $996. Price data was last updated on May 12, 2024.

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 $1,011). 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

$580

March

$600

April

$742

May

$879

June

$1,011

July

$980

August

$855

September

$766

October

$691

November

$560

December

$645

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 May 16, 2024.
Read through reviews of airlines operating flights from St. Louis to Porto, such as Delta, United Airlines 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
10,673 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.4

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
10,673 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.4

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
10,924 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.4

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
14,514 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.4

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
2,748 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.4

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
6,947 reviews
Delta
8.0
Very good
10,673 reviews
Check prices

Crew

8.6

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.4

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 $1,000 on Cheapflights?

    Yes, there are multiple flights from St. Louis to Porto for under $1,000. The cheapest flight booked recently is on Multiple Airlines for just $901, but on average you can expect to pay $980.

  • Are there last-minute flights available from St. Louis to Porto for under $1,300?

    There are currently 5+ open flights from St. Louis to Porto within the next 7 days for less than $1,300.

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

    Delta, at $940, was found to be the cheapest airline from St. Louis to Porto.Alternate airlines to your destination round-trip include United Airlines and Air Canada. Users have found that Delta is 14% 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 5/15.

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 2,637,452 searches. Data last updated May 16, 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.
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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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