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Cheap flight deals from St. Louis to Koh Samui Starting at PHP 87,721

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

  • Round-trip
      • STL07:00 am
        37h
        2 stops
        USM08:00 am
        Mon, Mar 10|St. Louis - Koh Samui|United Airlines
        USM08:55 am
        44h 58m
        2 stops
        STL05:53 pm
        Mon, Mar 17|Koh Samui - St. Louis|Scoot
        PHP 87,721PHP 139,124
        37% OFF
        37% OFF
        PHP 139,124PHP 87,721

        Choose United Airlines flights from St. Louis to Koh Samui. The one-way connecting flight with United Airlines departs from St. Louis Lambert International Airport on Mon, Mar 10-Mon, Mar 17, arriving at Samui International Airport. One-way Prices start from PHP 87,721 including taxes and charges.

      • STL09:00 am
        39h 5m
        2 stops
        USM01:05 pm
        Tue, Mar 4|St. Louis - Koh Samui|United Airlines
        USM01:25 pm
        40h 28m
        2 stops
        STL05:53 pm
        Mon, Mar 10|Koh Samui - St. Louis|Bangkok Airways
        PHP 90,866PHP 139,124
        35% OFF
        35% OFF
        PHP 139,124PHP 90,866

        Choose United Airlines flights from St. Louis to Koh Samui. The one-way connecting flight with United Airlines departs from St. Louis Lambert International Airport on Tue, Mar 4-Mon, Mar 10, arriving at Samui International Airport. One-way Prices start from PHP 90,866 including taxes and charges.

      • STL07:00 am
        50h 5m
        2 stops
        USM09:05 pm
        Mon, Mar 17|St. Louis - Koh Samui|United Airlines
        USM04:25 pm
        37h 28m
        2 stops
        STL05:53 pm
        Mon, Mar 24|Koh Samui - St. Louis|Bangkok Airways
        PHP 92,407PHP 139,124
        34% OFF
        34% OFF
        PHP 139,124PHP 92,407

        Choose United Airlines flights from St. Louis to Koh Samui. The one-way connecting flight with United Airlines departs from St. Louis Lambert International Airport on Mon, Mar 17-Mon, Mar 24, arriving at Samui International Airport. One-way Prices start from PHP 92,407 including taxes and charges.

      • STL07:00 am
        42h 5m
        2 stops
        USM01:05 pm
        Sun, Mar 16|St. Louis - Koh Samui|United Airlines
        USM04:25 pm
        37h 28m
        2 stops
        STL05:53 pm
        Sun, Mar 23|Koh Samui - St. Louis|Bangkok Airways
        PHP 92,878
        PHP 92,878

        Choose United Airlines flights from St. Louis to Koh Samui. The one-way connecting flight with United Airlines departs from St. Louis Lambert International Airport on Sun, Mar 16-Sun, Mar 23, arriving at Samui International Airport. One-way Prices start from PHP 92,878 including taxes and charges.

      • STL07:00 am
        48h 35m
        2 stops
        USM07:35 pm
        Sat, Mar 22|St. Louis - Koh Samui|United Airlines
        USM04:25 pm
        37h 28m
        2 stops
        STL05:53 pm
        Thu, Mar 27|Koh Samui - St. Louis|Bangkok Airways
        PHP 93,685
        PHP 93,685

        Choose United Airlines flights from St. Louis to Koh Samui. The one-way connecting flight with United Airlines departs from St. Louis Lambert International Airport on Sat, Mar 22-Thu, Mar 27, arriving at Samui International Airport. One-way Prices start from PHP 93,685 including taxes and charges.

      • STL09:00 am
        44h 15m
        2 stops
        USM06:15 pm
        Fri, Feb 21|St. Louis - Koh Samui|United Airlines
        USM01:25 pm
        42h 31m
        2 stops
        STL06:56 pm
        Fri, Feb 28|Koh Samui - St. Louis|Bangkok Airways
        PHP 96,607
        PHP 96,607

        Choose United Airlines flights from St. Louis to Koh Samui. The one-way connecting flight with United Airlines departs from St. Louis Lambert International Airport on Fri, Feb 21-Fri, Feb 28, arriving at Samui International Airport. One-way Prices start from PHP 96,607 including taxes and charges.

      • STL07:00 am
        47h 15m
        2 stops
        USM06:15 pm
        Wed, Mar 26|St. Louis - Koh Samui|United Airlines
        USM01:30 pm
        39h 22m
        2 stops
        STL04:52 pm
        Sun, Mar 30|Koh Samui - St. Louis|Bangkok Airways
        PHP 119,824
        PHP 119,824

        Choose United Airlines flights from St. Louis to Koh Samui. The one-way connecting flight with United Airlines departs from St. Louis Lambert International Airport on Wed, Mar 26-Sun, Mar 30, arriving at Samui International Airport. One-way Prices start from PHP 119,824 including taxes and charges.

      • STL06:29 pm
        61h 6m
        2 stops
        USM07:35 pm
        Sat, Mar 22|St. Louis - Koh Samui|American Airlines
        USM11:40 am
        47h 29m
        2 stops
        STL11:09 pm
        Thu, Mar 27|Koh Samui - St. Louis|Cathay Pacific
        PHP 125,030
        PHP 125,030

        Choose American Airlines flights from St. Louis to Koh Samui. The one-way connecting flight with American Airlines departs from St. Louis Lambert International Airport on Sat, Mar 22-Thu, Mar 27, arriving at Samui International Airport. One-way Prices start from PHP 125,030 including taxes and charges.

      • STL06:15 am
        49h 20m
        2 stops
        USM07:35 pm
        Mon, Mar 10|St. Louis - Koh Samui|American Airlines
        USM11:40 am
        47h 29m
        2 stops
        STL11:09 pm
        Mon, Mar 17|Koh Samui - St. Louis|Cathay Pacific
        PHP 125,469
        PHP 125,469

        Choose American Airlines flights from St. Louis to Koh Samui. The one-way connecting flight with American Airlines departs from St. Louis Lambert International Airport on Mon, Mar 10-Mon, Mar 17, arriving at Samui International Airport. One-way Prices start from PHP 125,469 including taxes and charges.

      • STL06:15 am
        49h 20m
        2 stops
        USM07:35 pm
        Sat, Mar 22|St. Louis - Koh Samui|Cathay Pacific
        USM11:40 am
        47h 29m
        2 stops
        STL11:09 pm
        Thu, Mar 27|Koh Samui - St. Louis|Cathay Pacific
        PHP 125,541
        PHP 125,541

        Choose Cathay Pacific flights from St. Louis to Koh Samui. The one-way connecting flight with Cathay Pacific departs from St. Louis Lambert International Airport on Sat, Mar 22-Thu, Mar 27, arriving at Samui International Airport. One-way Prices start from PHP 125,541 including taxes and charges.

      • STL01:00 pm
        3h 5m
        Nonstop
        USM02:00 pm
        Thu, Feb 27|St. Louis - Koh Samui|United Airlines
        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 Koh Samui Flight Time

Flight info.
Departure
Arrival
Weekly Schedule

  1. LH449

    Lufthansa

    03:30 pm

    STL

    8.9h

    07:25 am

    FRA

    --T-T-S
    Search

  2. TG921

    Thai Airways

    02:45 pm

    FRA

    10.7h

    06:25 am

    BKK

    SMTWTFS

  3. PG131

    Bangkok Airways

    10:25 am

    BKK

    1.6h

    12:00 pm

    USM

    SMTWTFS

  4. LH449

    Lufthansa

    03:30 pm

    STL

    8.9h

    07:25 am

    FRA

    --T-T-S
    Search

  5. TG921

    Thai Airways

    02:45 pm

    FRA

    10.7h

    06:25 am

    BKK

    SMTWTFS

  6. PG127

    Bangkok Airways

    10:10 am

    BKK

    1.5h

    11:40 am

    USM

    SMTWTFS

  7. LH449

    Lufthansa

    03:30 pm

    STL

    8.9h

    07:25 am

    FRA

    --T-T-S
    Search

  8. TG921

    Thai Airways

    02:45 pm

    FRA

    10.7h

    06:25 am

    BKK

    SMTWTFS

  9. PG123

    Bangkok Airways

    08:10 am

    BKK

    1.2h

    09:20 am

    USM

    SMTWTFS

  10. CX7740

    Cathay Pacific

    06:52 am

    STL

    4.1h

    08:58 am

    LAX

    S---T--
    Search

  11. CX881

    Cathay Pacific

    12:30 am

    LAX

    15.3h

    06:45 am

    HKG

    SMTWTFS

  12. CX6503

    Cathay Pacific

    04:15 pm

    HKG

    3.3h

    06:35 pm

    USM

    SMTWTFS

  13. CX7740

    Cathay Pacific

    06:52 am

    STL

    4.1h

    08:58 am

    LAX

    S---T--
    Search

  14. CX885

    Cathay Pacific

    12:25 pm

    LAX

    15.5h

    06:55 pm

    HKG

    S-T-T-S

  15. CX6503

    Cathay Pacific

    04:15 pm

    HKG

    3.3h

    06:35 pm

    USM

    SMTWTFS

  16. CX7740

    Cathay Pacific

    06:52 am

    STL

    4.1h

    08:58 am

    LAX

    S---T--
    Search

  17. CX883

    Cathay Pacific

    11:30 pm

    LAX

    15.3h

    05:45 am

    HKG

    SMTWTFS

  18. CX6503

    Cathay Pacific

    04:15 pm

    HKG

    3.3h

    06:35 pm

    USM

    SMTWTFS

  19. AA3242

    American Airlines

    06:52 am

    STL

    4.1h

    08:58 am

    LAX

    SM--TF-
    Search

  20. CX881

    Cathay Pacific

    12:30 am

    LAX

    15.3h

    06:45 am

    HKG

    SMTWTFS

  21. CX6503

    Cathay Pacific

    04:15 pm

    HKG

    3.3h

    06:35 pm

    USM

    SMTWTFS

  22. UA1314

    United Airlines

    09:00 am

    STL

    4.6h

    11:38 am

    SFO

    SMTWTFS
    Search

  23. UA001

    United Airlines

    10:40 pm

    SFO

    17.1h

    06:45 am

    SIN

    SMTWTFS

  24. PG968

    Bangkok Airways

    05:20 pm

    SIN

    1.9h

    06:15 pm

    USM

    SMTWTFS

  25. UA1314

    United Airlines

    09:00 am

    STL

    4.6h

    11:38 am

    SFO

    SMTWTFS
    Search

  26. UA001

    United Airlines

    10:40 pm

    SFO

    17.1h

    06:45 am

    SIN

    SMTWTFS

  27. PG966

    Bangkok Airways

    12:15 pm

    SIN

    1.9h

    01:10 pm

    USM

    -M-W-F-

  28. AA4591

    American Airlines

    10:12 am

    STL

    1.4h

    11:34 am

    ORD

    S--WT-S
    Search

  29. CX807

    Cathay Pacific

    03:40 pm

    ORD

    15.9h

    08:35 pm

    HKG

    SMTWTFS

  30. CX6503

    Cathay Pacific

    04:15 pm

    HKG

    3.3h

    06:35 pm

    USM

    SMTWTFS
Find more flights and airlines

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

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 Koh Samui (USM) the cheapest?

    Airlines adjust prices for flights from St. Louis to Koh Samui 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 Koh Samui (USM) cost?

    According to Trip.com's data, the lowest price is around PHP 132,183.

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

    • The distance from Samui International Airport to downtown is about 3 km. It takes about 20 minutes by taxi.

How to find a cheap flight from St. Louis to Koh Samui

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 Koh Samui. 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 Koh Samui

Off-season for travelJanuary
Peak season for travelDecember
Flight distance14,554.87 km
Popular airlineAmerican Airlines

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