$422+ Cheap flights from St. Louis (STL) to Porto (OPO)
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 7/7. Fares are subject to change and may not be available on all flights or dates of travel.
STL — OPO
Mar 5 — Mar 121
1 adult, Economy
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Find cheap flights from St. Louis to Porto with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to Porto
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to PortoExplore the most affordable flight options available from St. Louis to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 3, 2026.
Explore the most affordable flight options available from St. Louis to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 3, 2026.
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:48 am
STL
- OPO
2 stops26h 37m
Delta
Thu 4/235:00 am
OPO
- STL
2 stops41h 42m
Delta
Deal found 2/2![Delta logo]()
$494
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:48 am
STL
- OPO
2 stops26h 37m
Delta
Tue 4/216:15 am
OPO
- STL
2 stops36h 50m
Delta
Deal found 2/2![Delta logo]()
$501
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/126:32 am
STL
- OPO
2 stops26h 53m
Delta
Thu 4/235:00 am
OPO
- STL
2 stops34h 42m
Delta
Deal found 2/2![Delta logo]()
$544
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/141:45 pm
STL
- OPO
2 stops26h 20m
Delta
Thu 4/235:00 am
OPO
- STL
2 stops24h 13m
Delta
Deal found 2/2![Delta logo]()
$546
This United Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/77:00 pm
STL
- OPO
2 stops32h 30m
United Airlines
Tue 4/286:00 am
OPO
- STL
2 stops22h 28m
United Airlines
Deal found 2/1![United Airlines logo]()
$548
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:48 am
STL
- OPO
2 stops26h 37m
Delta
Mon 4/205:00 am
OPO
- STL
2 stops34h 42m
Delta
Deal found 2/2![Delta logo]()
$550
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/126:32 am
STL
- OPO
2 stops26h 53m
Delta
Tue 4/216:15 am
OPO
- STL
2 stops16h 35m
Delta
Deal found 2/2![Delta logo]()
$551
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/141:45 pm
STL
- OPO
2 stops26h 20m
Delta
Tue 4/216:15 am
OPO
- STL
2 stops32h 15m
Delta
Deal found 2/2![Delta logo]()
$552
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/311:39 pm
STL
- OPO
2 stops19h 46m
Delta
Tue 4/285:00 am
OPO
- STL
2 stops21h 42m
Delta
Deal found 2/1![Delta logo]()
$591
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/126:32 am
STL
- OPO
2 stops26h 53m
Delta
Mon 4/205:00 am
OPO
- STL
2 stops34h 42m
Delta
Deal found 2/2![Delta logo]()
$600
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:48 am
STL
- OPO
2 stops26h 37m
Delta
Sat 4/256:30 am
OPO
- STL
2 stops16h 12m
Delta
Deal found 2/2![Delta logo]()
$601
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/157:45 am
STL
- OPO
2 stops25h 55m
United Airlines
Thu 4/2312:00 pm
OPO
- STL
2 stops28h 28m
United Airlines
Deal found 2/2![United Airlines logo]()
$605
Best flights from St. Louis to PortoDiscover carefully curated flight deals from St. Louis to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 3, 2026.
Discover carefully curated flight deals from St. Louis to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 3, 2026.
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/141:45 pm
STL
- OPO
2 stops26h 20m
Delta
Wed 4/225:00 am
OPO
- STL
2 stops21h 42m
Delta
Deal found 2/2![Delta logo]()
$546
This United Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/77:00 pm
STL
- OPO
2 stops32h 30m
United Airlines
Tue 4/286:00 am
OPO
- STL
2 stops22h 28m
United Airlines
Deal found 2/1![United Airlines logo]()
$548
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:48 am
STL
- OPO
2 stops26h 37m
Delta
Mon 4/205:00 am
OPO
- STL
2 stops34h 42m
Delta
Deal found 2/2![Delta logo]()
$550
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/157:45 am
STL
- OPO
2 stops25h 55m
United Airlines
Fri 4/246:00 am
OPO
- STL
2 stops36h 22m
United Airlines
Deal found 2/2![United Airlines logo]()
$605
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/126:32 am
STL
- OPO
2 stops26h 53m
Delta
Tue 4/216:15 am
OPO
- STL
2 stops16h 35m
Delta
Deal found 2/2![Delta logo]()
$551
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/157:45 am
STL
- OPO
2 stops25h 55m
United Airlines
Thu 4/2312:00 pm
OPO
- STL
2 stops28h 28m
United Airlines
Deal found 2/2![United Airlines logo]()
$605
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/141:45 pm
STL
- OPO
2 stops26h 20m
Delta
Tue 4/216:15 am
OPO
- STL
2 stops32h 15m
Delta
Deal found 2/2![Delta logo]()
$552
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/166:00 am
STL
- OPO
2 stops27h 40m
United Airlines
Thu 4/236:00 am
OPO
- STL
2 stops32h 35m
United Airlines
Deal found 2/2![United Airlines logo]()
$609
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/311:39 pm
STL
- OPO
2 stops19h 46m
Delta
Tue 4/285:00 am
OPO
- STL
2 stops21h 42m
Delta
Deal found 2/1![Delta logo]()
$591
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/157:45 am
STL
- OPO
2 stops25h 55m
United Airlines
Tue 4/2112:35 pm
OPO
- STL
2 stops26h 50m
United Airlines
Deal found 2/2![United Airlines logo]()
$618
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/126:32 am
STL
- OPO
2 stops26h 53m
Delta
Mon 4/205:00 am
OPO
- STL
2 stops34h 42m
Delta
Deal found 2/2![Delta logo]()
$600
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/141:45 pm
STL
- OPO
2 stops26h 20m
Delta
Mon 4/205:00 am
OPO
- STL
2 stops34h 42m
Delta
Deal found 2/2![Delta logo]()
$601
Last-minute flights from St. Louis to PortoDiscover last-minute flight deals from St. Louis to Porto. Data last updated February 3, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Porto. Data last updated February 3, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/69:57 am
STL
- OPO
2 stops19h 43m
United Airlines
Tue 2/106:00 am
OPO
- STL
2 stops39h 29m
United Airlines
Deal found 1/31![United Airlines logo]()
$748
This United Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/77:00 pm
STL
- OPO
2 stops32h 30m
United Airlines
Tue 4/286:00 am
OPO
- STL
2 stops22h 28m
United Airlines
Deal found 2/1![United Airlines logo]()
$548
This Gotogate deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/76:18 pm
STL
- OPO
2 stops40h 22m
British Airways
Tue 4/288:40 pm
OPO
- STL
1 stop28h 50m
British Airways
Deal found 2/1![British Airways logo]()
$627
This FlightHub deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/184:50 pm
STL
- OPO
1 stop13h 50m
Lufthansa
Wed 3/256:00 am
OPO
- STL
2 stops17h 00m
Lufthansa
Deal found 2/2![Lufthansa logo]()
$688
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1810:12 am
STL
- OPO
2 stops19h 18m
Delta
Wed 3/255:00 am
OPO
- STL
2 stops23h 58m
Delta
Deal found 2/2![Delta logo]()
$695
This United Airlines deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/282:50 pm
STL
- OPO
2 stops42h 50m
United Airlines
Sun 4/56:00 am
OPO
- STL
2 stops22h 28m
United Airlines
Deal found 1/31![United Airlines logo]()
$917
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/311:39 pm
STL
- OPO
2 stops19h 46m
Delta
Tue 4/285:00 am
OPO
- STL
2 stops21h 42m
Delta
Deal found 2/1![Delta logo]()
$591
This Ovago deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/316:33 pm
STL
- OPO
2 stops18h 57m
British Airways
Tue 4/288:40 pm
OPO
- STL
1 stop28h 50m
British Airways
Deal found 2/1![British Airways logo]()
$655
This Lufthansa deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/3111:37 am
STL
- OPO
1 stop16h 08m
Lufthansa
Tue 4/284:35 pm
OPO
- STL
1 stop26h 50m
Lufthansa
Deal found 2/1![Lufthansa logo]()
$1,004
One-way flights from St. Louis to PortoSearch for one-way flight options from St. Louis to Porto. Find affordable one-way fares based on user searches. Data last updated February 3, 2026.
Search for one-way flight options from St. Louis to Porto. Find affordable one-way fares based on user searches. Data last updated February 3, 2026.
This KLM deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/71:30 pm
STL
- OPO
2 stops15h 00m
KLM
Deal found 2/3![KLM logo]()
$422
This Mytrip deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/712:10 pm
STL
- OPO
3 stops24h 50m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$553
Find 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 February 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $494 (Delta) |
One-way from | $422 (KLM) |
Popular in | July |
Cheapest in | January |
Average price | $520 |
Cheapflights Fare Finder
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 2,558,603 searches. Data last updated February 3, 2026.
Use the filters below to find and compare flights from St. Louis to Porto that are best for you.
Fly from
St. Louis
Fly to
Porto
Route
Depart
Return
Price
St. LouisPorto
STL - OPO
STLOPO
Lambert-St Louis
Tue 4/14
1:45 pm-10:05 pm
2 stops26h 20m
Porto
Wed 4/22
5:00 am-8:42 pm
2 stops21h 42m
$546
St. LouisPorto
STL - OPO
STLOPO
Lambert-St Louis
Sat 3/7
7:00 pm-9:30 am
2 stops32h 30m
Porto
Tue 4/28
6:00 am-10:28 pm
2 stops22h 28m
$548
St. LouisPorto
STL - OPO
STLOPO
Lambert-St Louis
Mon 4/13
6:48 am-3:25 pm
2 stops26h 37m
Porto
Mon 4/20
5:00 am-9:42 am
2 stops34h 42m
$550
St. LouisPorto
STL - OPO
STLOPO
Lambert-St Louis
Sun 4/12
6:32 am-3:25 pm
2 stops26h 53m
Porto
Tue 4/21
6:15 am-4:50 pm
2 stops16h 35m
$551
St. LouisPorto
STL - OPO
STLOPO
Lambert-St Louis
Tue 4/14
1:45 pm-10:05 pm
2 stops26h 20m
Porto
Tue 4/21
6:15 am-8:30 am
2 stops32h 15m
$552
St. LouisPorto
STL - OPO
STLOPO
Lambert-St Louis
Tue 3/31
1:39 pm-3:25 pm
2 stops19h 46m
Porto
Tue 4/28
5:00 am-8:42 pm
2 stops21h 42m
$591
St. LouisPorto
STL - OPO
STLOPO
Lambert-St Louis
Sun 4/12
6:32 am-3:25 pm
2 stops26h 53m
Porto
Mon 4/20
5:00 am-9:42 am
2 stops34h 42m
$600
St. LouisPorto
STL - OPO
STLOPO
Lambert-St Louis
Tue 4/14
1:45 pm-10:05 pm
2 stops26h 20m
Porto
Mon 4/20
5:00 am-9:42 am
2 stops34h 42m
$601
St. LouisPorto
STL - OPO
STLOPO
Lambert-St Louis
Wed 4/15
7:45 am-3:40 pm
2 stops25h 55m
Porto
Fri 4/24
6:00 am-12:22 pm
2 stops36h 22m
$605
St. LouisPorto
STL - OPO
STLOPO
Lambert-St Louis
Wed 4/15
7:45 am-3:40 pm
2 stops25h 55m
Porto
Thu 4/23
12:00 pm-10:28 am
2 stops28h 28m
$605
Showing 1-10 of 14 results
Compare providers for flights from St. Louis to Porto
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Porto in February.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars |
- Most accurate provider: When it comes to deals on St. Louis-Porto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Porto flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Porto flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Porto flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Porto flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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.
STL-OPO
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.
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 February 3, 2026.
Read reviews from past customers who have flown Delta, United Airlines, and American Airlines from St. Louis to Porto. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.2
Overall
7.9
Boarding
8.1
Comfort
7.9
Entertainment
7.8
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Overall
7.9
Boarding
8.1
Comfort
7.9
Entertainment
7.8
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Overall
7.9
Boarding
8.1
Comfort
7.9
Entertainment
7.8
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Overall
7.9
Boarding
8.1
Comfort
7.9
Entertainment
7.8
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Overall
7.9
Boarding
8.1
Comfort
7.9
Entertainment
7.8
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Overall
7.9
Boarding
8.1
Comfort
7.9
Entertainment
7.8
Crew
8.5
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
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.
Traveling to a place near Porto?
Book flights to Porto if you plan to visit one of these locationsVila Nova de Gaia
Aveiro
Arcos de Valdevez
Coimbra
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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.
Top 5 airlines flying from St. Louis to Porto
Discover the top 5 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 2,558,603 searches. Data last updated February 3, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$460 | Average$510 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$520 | Average$928 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$550 | Average$902 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$760 | Average$1,158 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$787 | Average$1,005 | FlexibilityNo cancel fee | On-time67% |