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Ko Samui

$427+ Cheap flights from Riverside, CA to Ko Samui (USM)

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 11/25. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — USM
Nov 20 — Nov 271
Thu 11/20
Thu 11/27
1 adult, Economy
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Cheap flight deals from Riverside to Ko Samui

Keep the following information in mind while searching for Riverside to Ko Samui flight deals. Data was last updated October 21, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$737
(FlightHub)

One-way from

$427
(Kiwi.com)

Popular in

February

Cheapest in

September

Average price

$1,105
Provider with most accurate pricing for Los Angeles-Ko Samui flight deals.
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Provider most trusted by Cheapflights users for Los Angeles-Ko Samui flights.
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From Riverside to Ko Samui
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One-way flight from Riverside to Ko Samui
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Highest demand for flights based on searches. 8% potential increase in price ($104 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($38 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Riverside to Ko Samui

Cheapest flights from Riverside to Ko Samui
Explore the most affordable flight options available from Riverside to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 21, 2025.

This oojo deal was found by Cheapflights users on 10/21. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1810:20 pmLAX - USM
2 stops26h 15mMultiple Airlines
Tue 11/251:55 pmUSM - LAX
2 stops20h 05mMultiple Airlines
Deal found 10/21$857
This FlightHub deal was found by Cheapflights users on 10/19. 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.
Tue 11/1110:05 pmLAX - USM
1 stop21h 55mSingapore Airlines
Sun 11/2312:00 pmUSM - LAX
1 stop22h 55mSingapore Airlines
Deal found 10/19$862
This oojo deal was found by Cheapflights users on 10/19. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/2310:50 pmLAX - USM
2 stops25h 45mMultiple Airlines
Thu 11/272:05 pmUSM - LAX
2 stops19h 55mMultiple Airlines
Deal found 10/19$881
This Justfly.com deal was found by Cheapflights users on 10/19. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/167:50 pmLAX - USM
1 stop24h 10mSingapore Airlines
Sun 11/2312:00 pmUSM - LAX
1 stop22h 55mSingapore Airlines
Deal found 10/19$904
This Justfly.com deal was found by Cheapflights users on 10/21. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1812:25 pmLAX - USM
2 stops31h 35mSingapore Airlines
Tue 11/2512:00 pmUSM - LAX
1 stop22h 55mSingapore Airlines
Deal found 10/21$957
This FlightHub deal was found by Cheapflights users on 10/20. 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.
Tue 11/1811:00 pmLAX - USM
2 stops24h 55mEVA Air
Tue 11/258:20 pmUSM - LAX
2 stops25h 40mEVA Air
Deal found 10/20$962
This Gotogate deal was found by Cheapflights users on 10/20. 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.
Thu 10/2312:00 pmLAX - USM
2 stops29h 35mEVA Air
Wed 11/58:45 pmUSM - LAX
2 stops25h 15mEVA Air
Deal found 10/20$1,015
This Gotogate deal was found by Cheapflights users on 10/20. 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.
Wed 10/2212:05 amLAX - USM
2 stops25h 05mMultiple Airlines
Wed 11/56:35 pmUSM - LAX
2 stops39h 50mMultiple Airlines
Deal found 10/20$1,097
This Gurufare deal was found by Cheapflights users on 10/19. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/111:40 amLAX - USM
2 stops30h 05mEVA Air
Sun 11/308:20 pmUSM - LAX
2 stops49h 30mEVA Air
Deal found 10/19$1,111

Cheapflights Fare Finder

 
Customize your flight search to find flights from Riverside to Ko Samui 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 October 21, 2025.
Use the filters below to find and compare flights from Riverside to Ko Samui that are best for you.

Fly from

Riverside

Fly to

Ko Samui

Route

Depart

Return

Price

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

Tue 3/3

10:05 pm-6:50 pm

1 stop29h 45m

Ko Samui

Tue 3/31

12:05 pm-9:50 pm

1 stop23h 45m

$738

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

Mon 3/2

10:05 pm-5:10 pm

1 stop28h 05m

Ko Samui

Sat 3/14

8:55 am-8:55 pm

1 stop26h 00m

$781

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

Sun 11/16

10:50 pm-8:15 pm

2 stops30h 25m

Ko Samui

Sun 11/23

2:30 pm-7:00 pm

2 stops19h 30m

$857

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

Tue 11/11

10:50 pm-3:35 pm

2 stops25h 45m

Ko Samui

Sun 11/23

2:30 pm-7:00 pm

2 stops19h 30m

$857

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

Fri 2/6

7:50 pm-8:00 am

1 stop21h 10m

Ko Samui

Sat 2/14

8:55 am-7:55 pm

1 stop26h 00m

$870

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

Thu 3/12

11:50 pm-3:35 pm

2 stops25h 45m

Ko Samui

Tue 3/17

2:30 pm-8:00 pm

2 stops19h 30m

$902

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

Sun 11/16

7:50 pm-11:00 am

1 stop24h 10m

Ko Samui

Sun 11/23

12:00 pm-7:55 pm

1 stop22h 55m

$904

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

Mon 3/2

10:50 pm-3:35 pm

2 stops25h 45m

Ko Samui

Sat 3/14

2:05 pm-8:00 pm

2 stops19h 55m

$905

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

Sat 1/10

10:50 pm-3:35 pm

2 stops25h 45m

Ko Samui

Tue 1/20

2:30 pm-7:00 pm

2 stops19h 30m

$955

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

Tue 11/18

12:25 pm-8:00 am

2 stops28h 35m

Ko Samui

Tue 11/25

12:00 pm-7:55 pm

1 stop22h 55m

$958

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/21

Showing 1-10 of 20 results
1
2

Best time to book a flight from Riverside to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from Riverside with our price prediction graph.
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.

Cheapflights Insights

Everything you need to know about your flight from Riverside to Ko Samui

What is the cheapest month to book a flight from Riverside to Ko Samui?

Currently, September is the cheapest month in which you can book a flight from Riverside to Ko Samui (average of $686). Flying from Riverside to Ko Samui in June is currently the most expensive (average of $1,386). 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.

What is the cheapest time of day to fly from R1V to USM?

Find hourly flight availability from Riverside to Ko Samui. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 21, 2025.

It’s typically best to fly out from Riverside to Ko Samui in the afternoon. Doing so could potentially save you 40% on the flight price compared to flying in the evening, which is usually more expensive.

What is the cheapest day to fly from Riverside to Ko Samui?

Use this chart to determine the cheapest time to fly round-trip from Riverside to Ko Samui. Price data was last updated on March 30, 2025.

Travelers seeking maximum savings on their Riverside to Ko Samui flight should consider departing on Thursday at noon when fares are most often at their lowest. Wednesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Ko Samui

Get insights into the airlines that provide service to Ko Samui. 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 Ko Samui. Reviews last updated October 21, 2025.
Peruse reviews from past customers who have flown with EVA Air and Singapore Airlines from Riverside to Ko Samui to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.4
Very good
1,255 reviews

Overall

8.4

Boarding

8.4

Comfort

8.3

Entertainment

8.0

Crew

8.6

Food

8.1

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak
EVA Air
8.4
Very good
1,255 reviews
EVA Air
8.4
Very good
1,255 reviews

Overall

8.4

Boarding

8.4

Comfort

8.3

Entertainment

8.0

Crew

8.6

Food

8.1

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak
Singapore Airlines
8.1
Very good
1,383 reviews
EVA Air
8.4
Very good
1,255 reviews

Overall

8.4

Boarding

8.4

Comfort

8.3

Entertainment

8.0

Crew

8.6

Food

8.1

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak

Related info for your journey

Find useful and relevant information for your journey from Riverside to Ko Samui. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ko Samui from Riverside?

    Ko Samui (USM) is the airport you will fly into if you book a flight from Riverside to Ko Samui. You should not have trouble finding flights to Ko Samui from Riverside; the airport handles an average of 0 inbound flights from Riverside per day. You should also have plenty of airline options to choose from since 2 airlines have flights to the Ko Samui airport from Riverside. It is only a 2.1 mi journey from Ko Samui (USM) to Ko Samui’s city center.

  • How long is the flight from Riverside to Ko Samui?

    A quick flight from Riverside to Ko Samui can take about 29h 45m. Singapore Airlines provides one of the quickest options available for as low as $738. The distance between Riverside and Ko Samui is about 8508 mi.

  • Can I find deals for flights from Riverside to Ko Samui that include hotel bookings?

    Yes. In addition to deals on Riverside to Ko Samui flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Riverside to Ko Samui?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Riverside to Ko Samui.

  • Can I find deals for business class flights from Riverside to Ko Samui?

    Yes. Cheapflights offers flight deals from Riverside to Ko Samui by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Riverside to Ko Samui?

    Currently, September is the cheapest month in which you can book a flight from Riverside to Ko Samui (average of $686). Flying from Riverside to Ko Samui in June is currently the most expensive (average of $1,386). 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.

See more FAQs

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Tao
Ko Pha Ngan

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Riverside to Ko Samui

Discover the top 2 airlines that operate flights from Riverside to Ko Samui. 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 October 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
Singapore AirlinesCheapest$756Average$1,120FlexibilityNo cancel feeOn-time81%
EVA AirCheapest$1,062Average$1,235FlexibilityNo cancel feeOn-time74%

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