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Cheap flight deals from St. Louis to Porto Starting at PHP 23,434

We've found these cheap flights for you. You can book one-way or round-trip flight tickets.

  • One way
  • Round-trip
      • STL06:06 am
        23h 49m
        1 stop
        OPO11:55 am
        Fri, Mar 7|St. Louis - Porto|Delta Air Lines
        PHP 23,434PHP 38,808
        40% OFF
        40% OFF
        PHP 38,808PHP 23,434

        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 PHP 23,434 including taxes and charges.

      • STL07:29 am
        22h 21m
        1 stop
        OPO11:50 am
        Tue, Feb 18|St. Louis - Porto|American Airlines
        PHP 25,618PHP 38,808
        34% OFF
        34% OFF
        PHP 38,808PHP 25,618

        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 PHP 25,618 including taxes and charges.

      • STL07:05 am
        22h 50m
        1 stop
        OPO11:55 am
        Fri, Feb 21|St. Louis - Porto|United Airlines
        PHP 26,008PHP 38,808
        33% OFF
        33% OFF
        PHP 38,808PHP 26,008

        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 PHP 26,008 including taxes and charges.

      • STL06:50 am
        23h
        1 stop
        OPO11:50 am
        Tue, Feb 18|St. Louis - Porto|Southwest Airlines
        PHP 28,422
        PHP 28,422

        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 PHP 28,422 including taxes and charges.

      • STL07:27 am
        22h 28m
        1 stop
        OPO11:55 am
        Fri, Mar 7|St. Louis - Porto|American Airlines
        PHP 28,614
        PHP 28,614

        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 PHP 28,614 including taxes and charges.

      • STL08:10 pm
        33h 40m
        1 stop
        OPO11:50 am
        Mon, Feb 17|St. Louis - Porto|Southwest Airlines
        PHP 29,450
        PHP 29,450

        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 PHP 29,450 including taxes and charges.

      • STL04:45 pm
        17h 25m
        1 stop
        OPO03:10 pm
        Sun, Mar 9|St. Louis - Porto|Lufthansa
        PHP 29,474
        PHP 29,474

        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 PHP 29,474 including taxes and charges.

      • STL03:45 pm
        13h 55m
        1 stop
        OPO11:40 am
        Fri, Feb 21|St. Louis - Porto|Lufthansa
        PHP 31,275
        PHP 31,275

        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 PHP 31,275 including taxes and charges.

      • STL03:45 pm
        13h 50m
        1 stop
        OPO11:35 am
        Sun, Mar 2|St. Louis - Porto|Lufthansa
        PHP 31,498
        PHP 31,498

        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 PHP 31,498 including taxes and charges.

      • STL04:45 pm
        17h 30m
        1 stop
        OPO03:15 pm
        Fri, Mar 21|St. Louis - Porto|United Airlines
        PHP 32,622
        PHP 32,622

        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 PHP 32,622 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 info.
Departure
Arrival
Weekly Schedule

  1. SN9013

    Brussels Airlines

    01:00 pm

    STL

    2.1h

    04:09 pm

    IAD

    SMTWTFS
    Search

  2. SN8802

    Brussels Airlines

    05:35 pm

    IAD

    7.7h

    07:15 am

    BRU

    SMTWTFS

  3. SN3811

    Brussels Airlines

    10:30 am

    BRU

    2.6h

    12:05 pm

    OPO

    SMTWTFS

  4. UA9067

    United Airlines

    03:25 pm

    STL

    8.9h

    07:20 am

    FRA

    --T-T-S
    Search

  5. UA8972

    United Airlines

    01:55 pm

    FRA

    2.8h

    03:45 pm

    OPO

    SMT--FS

  6. UA9067

    United Airlines

    03:25 pm

    STL

    8.9h

    07:20 am

    FRA

    --T-T-S
    Search

  7. UA8872

    United Airlines

    09:30 am

    FRA

    2.8h

    11:20 am

    OPO

    SMTWTF-

  8. LH449

    Lufthansa

    03:30 pm

    STL

    8.9h

    07:25 am

    FRA

    --T-T-S
    Search

  9. LH1178

    Lufthansa

    01:30 pm

    FRA

    2.9h

    03:25 pm

    OPO

    SMT--FS

  10. LH449

    Lufthansa

    03:30 pm

    STL

    8.9h

    07:25 am

    FRA

    --T-T-S
    Search

  11. LH1176

    Lufthansa

    09:25 am

    FRA

    2.8h

    11:15 am

    OPO

    SMTWTF-

  12. UA3424

    United Airlines

    06:22 pm

    STL

    2.6h

    10:00 pm

    EWR

    SMTWTFS
    Search

  13. UA074

    United Airlines

    09:30 pm

    EWR

    8.3h

    11:45 am

    FRA

    ----T-S

  14. UA8972

    United Airlines

    01:55 pm

    FRA

    2.8h

    03:45 pm

    OPO

    SMT--FS

  15. AA4404

    American Airlines

    07:29 am

    STL

    2.4h

    10:53 am

    LGA

    SMTWT--
    Search

  16. IB212

    Iberia

    04:45 pm

    JFK

    7.3h

    06:00 am

    MAD

    S-T-TFS

  17. IB543

    Iberia

    07:20 am

    MAD

    1.3h

    07:35 am

    OPO

    SMTWTFS

  18. UA3684

    United Airlines

    11:49 am

    STL

    2.6h

    03:27 pm

    EWR

    SMTWTFS
    Search

  19. S4274

    Azores Airlines

    09:20 pm

    JFK

    9.6h

    11:55 am

    OPO

    ----T--

  20. UA3684

    United Airlines

    11:49 am

    STL

    2.6h

    03:27 pm

    EWR

    SMTWTFS
    Search

  21. S4276

    Azores Airlines

    09:20 pm

    JFK

    9.5h

    11:50 am

    OPO

    -M-----

  22. VS2061

    Virgin Atlantic

    12:10 pm

    STL

    1.6h

    01:49 pm

    MSP

    SMTWTFS
    Search

  23. VS3934

    Virgin Atlantic

    03:50 pm

    MSP

    8.1h

    06:55 am

    AMS

    SMTWTFS

  24. KL1571

    KLM

    08:55 am

    AMS

    2.8h

    10:40 am

    OPO

    SMTWTFS
Find more flights and airlines

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

We monitor flight fares to help you find the best deals effortlessly

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 departure date and time of your selection. By analyzing data from all airlines, we've discovered that 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 PHP 63,458.

  • 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. It takes about 20 minutes by taxi.

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

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from St. Louis to Porto. Book your flights at the right time and save more.
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 nonstop flight pricePHP 23,434
Off-season for travelMarch
Peak season for travelDecember
Flight distance6,685.08 km
Popular airlineAmerican Airlines

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