App
Customer Support
TWD
Find Bookings
Worldwide Coverage
Worldwide Coverage
Flights to over 5,000 cities
One-stop Service Guarantee
One-stop Service Guarantee
Price guaranteed upon confirmed payment, booking guaranteed once tickets issued
Secure Payment
Secure Payment
Convenient & reliable booking and payment system

Cheap flight deals from St. Louis to Porto Starting at TWD 13,264

For as little as TWD 13,264, you can take your next adventure to Porto without breaking the bank. Choose between one-way and return tickets from St. Louis below.

  • One way
  • Round-trip
      • STL06:06
        23h 49m
        1 stop
        OPO11:55
        Fri, Mar 7|St. Louis - Porto|Delta Air Lines
        TWD 13,264TWD 21,966
        40% OFF
        40% OFF
        TWD 21,966TWD 13,264

        Choose Delta Air Lines flights from St. Louis to Porto. The one-way connecting flight with Delta Air Lines departs from St. Louis Lambert International Airport on Fri, Mar 7, arriving at Francisco Sa Carneiro International Airport. One-way Prices start from TWD 13,264 including taxes and charges.

      • STL07:29
        22h 21m
        1 stop
        OPO11:50
        Tue, Feb 18|St. Louis - Porto|American Airlines
        TWD 14,500TWD 21,966
        34% OFF
        34% OFF
        TWD 21,966TWD 14,500

        Choose American Airlines flights from St. Louis to Porto. The one-way connecting flight with American Airlines departs from St. Louis Lambert International Airport on Tue, Feb 18, arriving at Francisco Sa Carneiro International Airport. One-way Prices start from TWD 14,500 including taxes and charges.

      • STL07:05
        22h 50m
        1 stop
        OPO11:55
        Fri, Feb 21|St. Louis - Porto|United Airlines
        TWD 14,721TWD 21,966
        33% OFF
        33% OFF
        TWD 21,966TWD 14,721

        Choose United Airlines flights from St. Louis to Porto. The one-way connecting flight with United Airlines departs from St. Louis Lambert International Airport on Fri, Feb 21, arriving at Francisco Sa Carneiro International Airport. One-way Prices start from TWD 14,721 including taxes and charges.

      • STL06:50
        23h
        1 stop
        OPO11:50
        Tue, Feb 18|St. Louis - Porto|Southwest Airlines
        TWD 16,088
        TWD 16,088

        Choose Southwest Airlines flights from St. Louis to Porto. The one-way connecting flight with Southwest Airlines departs from St. Louis Lambert International Airport on Tue, Feb 18, arriving at Francisco Sa Carneiro International Airport. One-way Prices start from TWD 16,088 including taxes and charges.

      • STL07:27
        22h 28m
        1 stop
        OPO11:55
        Fri, Mar 7|St. Louis - Porto|American Airlines
        TWD 16,196
        TWD 16,196

        Choose American Airlines flights from St. Louis to Porto. The one-way connecting flight with American Airlines departs from St. Louis Lambert International Airport on Fri, Mar 7, arriving at Francisco Sa Carneiro International Airport. One-way Prices start from TWD 16,196 including taxes and charges.

      • STL20:10
        33h 40m
        1 stop
        OPO11:50
        Mon, Feb 17|St. Louis - Porto|Southwest Airlines
        TWD 16,669
        TWD 16,669

        Choose Southwest Airlines flights from St. Louis to Porto. The one-way connecting flight with Southwest Airlines departs from St. Louis Lambert International Airport on Mon, Feb 17, arriving at Francisco Sa Carneiro International Airport. One-way Prices start from TWD 16,669 including taxes and charges.

      • STL16:45
        17h 25m
        1 stop
        OPO15:10
        Sun, Mar 9|St. Louis - Porto|Lufthansa
        TWD 16,683
        TWD 16,683

        Choose Lufthansa flights from St. Louis to Porto. The one-way connecting flight with Lufthansa departs from St. Louis Lambert International Airport on Sun, Mar 9, arriving at Francisco Sa Carneiro International Airport. One-way Prices start from TWD 16,683 including taxes and charges.

      • STL15:45
        13h 55m
        1 stop
        OPO11:40
        Fri, Feb 21|St. Louis - Porto|Lufthansa
        TWD 17,702
        TWD 17,702

        Choose Lufthansa flights from St. Louis to Porto. The one-way connecting flight with Lufthansa departs from St. Louis Lambert International Airport on Fri, Feb 21, arriving at Francisco Sa Carneiro International Airport. One-way Prices start from TWD 17,702 including taxes and charges.

      • STL15:45
        13h 50m
        1 stop
        OPO11:35
        Sun, Mar 2|St. Louis - Porto|Lufthansa
        TWD 17,828
        TWD 17,828

        Choose Lufthansa flights from St. Louis to Porto. The one-way connecting flight with Lufthansa departs from St. Louis Lambert International Airport on Sun, Mar 2, arriving at Francisco Sa Carneiro International Airport. One-way Prices start from TWD 17,828 including taxes and charges.

      • STL16:45
        17h 30m
        1 stop
        OPO15:15
        Fri, Mar 21|St. Louis - Porto|United Airlines
        TWD 18,464
        TWD 18,464

        Choose United Airlines flights from St. Louis to Porto. The one-way connecting flight with United Airlines departs from St. Louis Lambert International Airport on Fri, Mar 21, arriving at Francisco Sa Carneiro International Airport. One-way Prices start from TWD 18,464 including taxes and charges.

      • STL01:00 pm
        3h 5m
        Nonstop
        OPO02:00 pm
        Sun, Feb 23|St. Louis - Porto|Delta Air Lines
        Find More Flights
        Find More Flights

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

St. Louis to Porto flight time & flight schedules

Flight info.
Departure
Arrival
Weekly Schedule

  1. AA4404

    American Airlines

    07:29

    STL

    2.4h

    10:53

    LGA

    SMTWT--
    Search

  2. IB212

    Iberia

    16:45

    JFK

    7.3h

    06:00

    MAD

    S-T-TFS

  3. IB543

    Iberia

    07:20

    MAD

    1.3h

    07:35

    OPO

    SMTWTFS

  4. UA3684

    United Airlines

    11:49

    STL

    2.6h

    15:27

    EWR

    SMTWTFS
    Search

  5. S4274

    Azores Airlines

    21:20

    JFK

    9.6h

    11:55

    OPO

    ----T--

  6. UA3684

    United Airlines

    11:49

    STL

    2.6h

    15:27

    EWR

    SMTWTFS
    Search

  7. S4276

    Azores Airlines

    21:20

    JFK

    9.5h

    11:50

    OPO

    -M-----

  8. VS2061

    Virgin Atlantic

    12:10

    STL

    1.6h

    13:49

    MSP

    SMTWTFS
    Search

  9. VS3934

    Virgin Atlantic

    15:50

    MSP

    8.1h

    06:55

    AMS

    SMTWTFS

  10. KL1571

    KLM

    08:55

    AMS

    2.8h

    10:40

    OPO

    SMTWTFS

  11. SN9013

    Brussels Airlines

    13:00

    STL

    2.1h

    16:09

    IAD

    SMTWTFS
    Search

  12. SN8802

    Brussels Airlines

    17:35

    IAD

    7.7h

    07:15

    BRU

    SMTWTFS

  13. SN3811

    Brussels Airlines

    10:30

    BRU

    2.6h

    12:05

    OPO

    SMTWTFS

  14. UA9067

    United Airlines

    15:25

    STL

    8.9h

    07:20

    FRA

    --T-T-S
    Search

  15. UA8972

    United Airlines

    13:55

    FRA

    2.8h

    15:45

    OPO

    SMT--FS

  16. UA9067

    United Airlines

    15:25

    STL

    8.9h

    07:20

    FRA

    --T-T-S
    Search

  17. UA8872

    United Airlines

    09:30

    FRA

    2.8h

    11:20

    OPO

    SMTWTF-

  18. LH449

    Lufthansa

    15:30

    STL

    8.9h

    07:25

    FRA

    --T-T-S
    Search

  19. LH1178

    Lufthansa

    13:30

    FRA

    2.9h

    15:25

    OPO

    SMT--FS

  20. LH449

    Lufthansa

    15:30

    STL

    8.9h

    07:25

    FRA

    --T-T-S
    Search

  21. LH1176

    Lufthansa

    09:25

    FRA

    2.8h

    11:15

    OPO

    SMTWTF-

  22. UA3424

    United Airlines

    18:22

    STL

    2.6h

    22:00

    EWR

    SMTWTFS
    Search

  23. UA074

    United Airlines

    21:30

    EWR

    8.3h

    11:45

    FRA

    ----T-S

  24. UA8972

    United Airlines

    13:55

    FRA

    2.8h

    15:45

    OPO

    SMT--FS
Find more flights and airlines

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

These price trend charts carefully monitor and predict how flight prices from St. Louis to Porto will change. Keep a close eye on them to understand when the best time to buy your tickets is.

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Frequently Asked Questions

  • When are flight tickets from St. Louis (STL) to Porto (OPO) the cheapest?

    Airlines adjust prices for flights from St. Louis to Porto based on the date and time of your booking. By analyzing data from all airlines, on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.

  • How much do flights from St. Louis (STL) to Porto (OPO) cost?

    According to Trip.com's data, the lowest price is around TWD 35,918.

  • What is the transportation method from the main airport to downtown in Porto?

    • The distance from Francisco Sa Carneiro International Airport to downtown is about 9 km, by taxi about 20 minutes.

  • How many airports are there in Porto (OPO)?

    There are 1 airport(s) near Porto (OPO): Francisco Sa Carneiro International Airport.

How to find a cheap flight from St. Louis to Porto

Understanding the common pitfalls when booking your flight tickets can help you save massively when it comes time to fly. We’ve listed our six essential steps to keep in mind when you’re booking flight tickets to help you find the best price.
1
Book Early
Once prices are gone, they're gone. Lock in deals while you can!
2
Compare Flight Prices
Compare prices on travel agency and airline websites.
3
Look Out for Deals
Check airline and travel agency websites for latest flight deals
4
Check One-way Fares
Buying two cheap one-way flights can sometimes be a better deal than a round-trip.
5
Try Different Dates
Flying during the week, early in the morning, or late at night can help save money.
6
Use the Trip.com App
Save up to £10 per person when booking your flights on Trip.com

Flight Info | St. Louis to Porto

Cheapest direct flight priceTWD 13,264
Off-season for travelMarch
Peak season for travelDecember
Flight distance6,685.08 km
Popular airlineAmerican Airlines

Contact Us

About

Other Services

Payment Methods
Our Partners
Copyright © 2025 Trip.com Travel Singapore Pte. Ltd. All rights reserved
Site Operator: Trip.com Travel Singapore Pte. Ltd.