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Cheap flights from St. Louis (STL) to Porto (OPO) from $500

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 6/15. 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 15 — May 221
From?
To?
Wed 5/15
Wed 5/22
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 10, 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 Iberia flights from St. Louis to Porto

Explore cheap flight options specifically provided by Iberia 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 2,717,708 searches. Data last updated May 10, 2024.
Consider these cheap Iberia flights we've found departing from St. Louis to Porto. It's recommended that users confirm their flight details before booking.
Tue 10/110:45 amSTL - OPO
2 stops14h 50mIberia
Tue 10/158:35 pmOPO - STL
2 stops31h 49mIberia
Deal found 5/9$938
Mon 5/2011:40 amSTL - OPO
2 stops22h 15mIberia
Fri 5/248:15 amOPO - STL
2 stops17h 31mIberia
Deal found 5/9$1,967
Thu 5/2311:40 amSTL - OPO
2 stops22h 15mIberia
Fri 5/248:35 pmOPO - STL
2 stops29h 11mIberia
Deal found 5/9$2,271

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 2,717,708 searches. Data last updated May 10, 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 5/9$964
Tue 10/15:30 pmSTL - OPO
1 stop10h 15mUnited Airlines
Tue 10/1512:15 pmOPO - STL
1 stop31h 15mUnited Airlines
Deal found 5/9$985
Thu 6/135:25 pmSTL - OPO
1 stop10h 20mUnited Airlines
Wed 6/199:00 amOPO - STL
1 stop12h 58mUnited Airlines
Deal found 5/10$1,107
Thu 6/136:15 amSTL - OPO
2 stops18h 40mUnited Airlines
Wed 6/199:00 amOPO - STL
2 stops19h 15mUnited Airlines
Deal found 5/10$1,111
Mon 5/205:35 pmSTL - OPO
1 stop10h 10mUnited Airlines
Tue 5/289:00 amOPO - STL
1 stop12h 58mUnited Airlines
Deal found 5/9$1,472
Mon 5/205:35 pmSTL - OPO
1 stop10h 10mUnited Airlines
Sun 5/269:00 amOPO - STL
1 stop12h 58mUnited Airlines
Deal found 5/9$1,522

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 2,717,708 searches. Prices were last updated on May 10, 2024.
Scroll through some of the best deals on flights from St. Louis to Porto in 2024. Check back regularly for other flight deals.
Fri 5/1011:00 amSTL - OPO
2 stops25h 30mMultiple Airlines
Fri 5/176:10 amOPO - STL
3 stops34h 18mMultiple Airlines
Deal found 5/9$995
Thu 6/135:25 pmSTL - OPO
1 stop10h 20mUnited Airlines
Wed 6/199:00 amOPO - STL
1 stop12h 58mUnited Airlines
Deal found 5/10$1,107
Thu 6/136:15 amSTL - OPO
2 stops18h 40mUnited Airlines
Wed 6/199:00 amOPO - STL
2 stops19h 15mUnited Airlines
Deal found 5/10$1,111
Mon 5/2011:00 amSTL - OPO
2 stops18h 20mMultiple Airlines
Mon 5/277:15 pmOPO - STL
2 stops30h 46mMultiple Airlines
Deal found 5/9$1,228
Fri 5/1011:00 amSTL - OPO
2 stops18h 20mMultiple Airlines
Fri 5/176:05 pmOPO - STL
2 stops22h 23mMultiple Airlines
Deal found 5/9$1,239
Wed 5/229:50 amSTL - OPO
2 stops23h 45mMultiple Airlines
Mon 5/277:15 pmOPO - STL
2 stops30h 46mMultiple Airlines
Deal found 5/9$1,251
Fri 5/1011:00 amSTL - OPO
2 stops18h 20mMultiple Airlines
Fri 5/178:45 amOPO - STL
1 stop18h 20mMultiple Airlines
Deal found 5/9$1,272
Wed 5/229:50 amSTL - OPO
2 stops40h 05mMultiple Airlines
Sun 5/266:00 amOPO - STL
1 stop13h 30mMultiple Airlines
Deal found 5/9$1,380
Fri 5/103:25 pmSTL - OPO
3 stops23h 50mMultiple Airlines
Fri 5/176:10 amOPO - STL
3 stops34h 18mMultiple Airlines
Deal found 5/9$1,410

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 2,717,708 searches. Data last updated May 10, 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 11/144:10 pmSTL - OPO
2 stops20h 30mAir Canada
Mon 11/186:00 amOPO - STL
2 stops33h 53mAir Canada
Deal found 5/9$778
Thu 11/144:10 pmSTL - OPO
2 stops20h 30mAir Canada
Mon 11/186:00 amOPO - STL
2 stops33h 53mAir Canada
Deal found 5/8$779
Tue 10/110:45 amSTL - OPO
2 stops14h 50mIberia
Tue 10/158:35 pmOPO - STL
2 stops31h 49mIberia
Deal found 5/9$938
Tue 10/18:50 amSTL - OPO
2 stops18h 55mUnited Airlines
Tue 10/1512:15 pmOPO - STL
1 stop31h 15mUnited Airlines
Deal found 5/9$964
Mon 9/97:15 pmSTL - OPO
2 stops21h 00mDelta
Sat 9/216:30 amOPO - STL
2 stops21h 01mDelta
Deal found 5/9$981
Tue 10/15:30 pmSTL - OPO
1 stop10h 15mUnited Airlines
Tue 10/1512:15 pmOPO - STL
1 stop31h 15mUnited Airlines
Deal found 5/9$985
Fri 5/1011:00 amSTL - OPO
2 stops25h 30mMultiple Airlines
Fri 5/176:10 amOPO - STL
3 stops34h 18mMultiple Airlines
Deal found 5/9$995
Thu 6/135:25 pmSTL - OPO
1 stop10h 20mUnited Airlines
Wed 6/199:00 amOPO - STL
1 stop12h 58mUnited Airlines
Deal found 5/10$1,107
Thu 6/136:15 amSTL - OPO
2 stops18h 40mUnited Airlines
Wed 6/199:00 amOPO - STL
2 stops19h 15mUnited Airlines
Deal found 5/10$1,111

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 2,717,708 searches. Data last updated May 10, 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.
Mon 5/2011:00 amSTL - OPO
2 stops18h 20mMultiple Airlines
Mon 5/277:15 pmOPO - STL
2 stops30h 46mMultiple Airlines
Deal found 5/9$1,228
Mon 5/205:35 pmSTL - OPO
1 stop10h 10mUnited Airlines
Tue 5/289:00 amOPO - STL
1 stop12h 58mUnited Airlines
Deal found 5/9$1,472
Mon 5/2011:10 amSTL - OPO
2 stops17h 10mLufthansa
Tue 5/286:00 amOPO - STL
2 stops15h 41mLufthansa
Deal found 5/9$1,511
Mon 5/205:35 pmSTL - OPO
1 stop10h 10mUnited Airlines
Sun 5/269:00 amOPO - STL
1 stop12h 58mUnited Airlines
Deal found 5/9$1,522
Mon 5/2011:10 amSTL - OPO
2 stops17h 10mLufthansa
Sun 5/266:00 amOPO - STL
1 stop13h 30mLufthansa
Deal found 5/9$1,551
Mon 5/2011:00 amSTL - OPO
2 stops18h 20mMultiple Airlines
Sun 5/266:00 amOPO - STL
2 stops21h 05mMultiple Airlines
Deal found 5/9$1,654
Mon 5/2011:40 amSTL - OPO
2 stops22h 15mIberia
Fri 5/248:15 amOPO - STL
2 stops17h 31mIberia
Deal found 5/9$1,967
Mon 5/2011:00 amSTL - OPO
2 stops18h 20mMultiple Airlines
Sat 5/257:20 pmOPO - STL
2 stops31h 45mMultiple Airlines
Deal found 5/9$2,008
Mon 5/2011:10 amSTL - OPO
2 stops17h 10mLufthansa
Fri 5/246:00 amOPO - STL
1 stop13h 30mLufthansa
Deal found 5/9$2,081

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 2,717,708 searches. Data last updated May 10, 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 6/156:22 pmSTL - OPO
3 stops55h 13mMultiple Airlines
Deal found 5/9$500
Wed 7/249:20 pmSTL - OPO
2 stops27h 40mMultiple Airlines
Deal found 5/9$535
Sat 6/1511:34 amSTL - OPO
2 stops28h 56mMultiple Airlines
Deal found 5/9$576
Wed 7/243:25 pmSTL - OPO
1 stop25h 20mLufthansa
Deal found 5/9$807
Fri 8/306:05 pmSTL - OPO
3 stops58h 45mMultiple Airlines
Deal found 5/9$1,988
Wed 7/246:13 pmSTL - OPO
3 stops22h 12mMultiple Airlines
Deal found 5/9$2,149
Sat 8/3110:10 amSTL - OPO
3 stops27h 35mMultiple Airlines
Deal found 5/9$2,153
Fri 8/308:25 amSTL - OPO
2 stops20h 00mLufthansa
Deal found 5/9$2,851
Fri 8/303:25 pmSTL - OPO
1 stop18h 30mLufthansa
Deal found 5/9$2,865

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 2,717,708 searches. Data last updated May 10, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$938 - $1,656

Route

Depart

Return

Price

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 10/1

2 stops14h 50m

Porto

Tue 10/15

2 stops31h 49m

$938

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 10/1

2 stops18h 55m

Porto

Tue 10/15

1 stop31h 15m

$964

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 9/9

2 stops21h 00m

Porto

Sat 9/21

2 stops21h 01m

$981

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 10/1

1 stop10h 15m

Porto

Tue 10/15

1 stop31h 15m

$985

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Thu 6/13

1 stop10h 20m

Porto

Wed 6/19

1 stop12h 58m

$1,107

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 5/20

2 stops18h 20m

Porto

Mon 5/27

2 stops30h 46m

$1,228

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Mon 9/9

2 stops24h 00m

Porto

Sat 9/21

1 stop26h 45m

$1,271

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Wed 5/22

2 stops23h 45m

Porto

Tue 5/28

2 stops17h 21m

$1,627

Lambert-St LouisPorto

STL - OPO

STLOPO

Lambert-St Louis

Tue 5/21

2 stops35h 50m

Porto

Sat 5/25

2 stops28h 51m

$1,656

Flights are sorted by cheapest first

Deals found on 5/9

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 5, 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 $1,603 while a round-trip flight costs $1,195. Price data was last updated on May 5, 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 $1,016). 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

$742

May

$879

June

$1,016

July

$983

August

$865

September

$766

October

$694

November

$554

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 10, 2024.
Read through reviews of airlines operating flights from St. Louis to Porto, such as Iberia, United Airlines and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.1
Very good
10,768 reviews
Check prices

Food

7.4

Entertainment

8.0

Crew

8.6

Comfort

7.9

Overall

8.1

Boarding

8.2

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
8.1
Very good
10,768 reviews
Delta
8.1
Very good
10,768 reviews
Check prices

Food

7.4

Entertainment

8.0

Crew

8.6

Comfort

7.9

Overall

8.1

Boarding

8.2

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.

Turkish Airlines
7.5
Good
3,713 reviews
Delta
8.1
Very good
10,768 reviews
Check prices

Food

7.4

Entertainment

8.0

Crew

8.6

Comfort

7.9

Overall

8.1

Boarding

8.2

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
11,016 reviews
Delta
8.1
Very good
10,768 reviews
Check prices

Food

7.4

Entertainment

8.0

Crew

8.6

Comfort

7.9

Overall

8.1

Boarding

8.2

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
14,641 reviews
Delta
8.1
Very good
10,768 reviews
Check prices

Food

7.4

Entertainment

8.0

Crew

8.6

Comfort

7.9

Overall

8.1

Boarding

8.2

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
2,750 reviews
Delta
8.1
Very good
10,768 reviews
Check prices

Food

7.4

Entertainment

8.0

Crew

8.6

Comfort

7.9

Overall

8.1

Boarding

8.2

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 Iberia for just $938, but on average you can expect to pay $1,320.

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

    There are currently 10+ 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?

    Iberia, at $938, was found to be the cheapest airline from St. Louis to Porto.Alternate airlines to your destination round-trip include United Airlines and Delta. Users have found that Iberia 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 5/10.

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 2,717,708 searches. Data last updated May 10, 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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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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