HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ko Samui

$457+ 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 9/17. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — USM
ago. 25 — sep. 11
lun. 8/25
lun. 9/1
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Riverside to Ko Samui 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 Riverside to Ko Samui

Keep the following information in mind while searching for Riverside to Ko Samui flight deals. Data was last updated agosto 20, 2025.

Round-trip from

$707
(FlightHub)

One-way from

$457
(Kiwi.com)

Popular in

June

Cheapest in

April

Average price

$1,159
From Riverside to Ko Samui
Search Deals
One-way flight from Riverside to Ko Samui
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($124 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

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 agosto 20, 2025.

This FlightHub deal was found by Cheapflights users on 8/17. 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.
mié. 10/2911:05 pmLAX - USM
1 stop29h 45mSingapore Airlines
mar. 11/48:55 amUSM - LAX
1 stop26h 00mSingapore Airlines
Deal found 8/17$707
This Trip.com deal was found by Cheapflights users on 8/19. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/1010:55 amLAX - USM
2 stops29h 15mMultiple Airlines
lun. 11/247:00 amUSM - LAX
2 stops27h 10mMultiple Airlines
Deal found 8/19$812
This Justfly.com deal was found by Cheapflights users on 8/18. 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.
dom. 9/711:55 pmLAX - USM
1 stop26h 50mSingapore Airlines
sáb. 9/137:25 pmUSM - LAX
1 stop37h 40mSingapore Airlines
Deal found 8/18$847
This Trip.com deal was found by Cheapflights users on 8/18. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/2112:50 pmLAX - USM
2 stops29h 10mMultiple Airlines
mié. 9/36:55 amUSM - LAX
2 stops40h 50mMultiple Airlines
Deal found 8/18$851
This Trip.com deal was found by Cheapflights users on 8/18. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/212:50 pmLAX - USM
2 stops28h 45mMultiple Airlines
jue. 10/98:45 amUSM - LAX
2 stops25h 55mMultiple Airlines
Deal found 8/18$873
This FlightHub deal was found by Cheapflights users on 8/18. 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.
sáb. 9/2711:55 pmLAX - USM
1 stop28h 35mSingapore Airlines
lun. 10/67:25 pmUSM - LAX
1 stop40h 25mSingapore Airlines
Deal found 8/18$911
This lastminute.com deal was found by Cheapflights users on 8/19. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/1010:05 pmLAX - USM
1 stop21h 45mSingapore Airlines
lun. 11/247:45 pmUSM - LAX
1 stop39h 10mSingapore Airlines
Deal found 8/19$936
This Singapore Airlines deal was found by Cheapflights users on 8/19. 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 Singapore Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/38:40 pmLAX - USM
1 stop21h 10mSingapore Airlines
vie. 10/108:45 amUSM - LAX
1 stop27h 05mSingapore Airlines
Deal found 8/19$963

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 agosto 20, 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

mié. 10/29

11:05 pm-6:50 pm

1 stop29h 45m

Ko Samui

mar. 11/4

8:55 am-7:55 pm

1 stop26h 00m

$707

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

lun. 1/12

12:25 pm-8:00 am

2 stops28h 35m

Ko Samui

mié. 1/28

8:55 am-7:55 pm

1 stop26h 00m

$755

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

lun. 11/10

10:55 am-7:10 am

2 stops29h 15m

Ko Samui

lun. 11/24

7:00 am-7:10 pm

2 stops27h 10m

$812

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

lun. 1/12

1:20 pm-8:10 am

2 stops27h 50m

Ko Samui

mié. 1/28

9:10 pm-11:05 am

2 stops28h 55m

$827

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

dom. 9/7

11:55 pm-4:45 pm

1 stop26h 50m

Ko Samui

sáb. 9/13

7:25 pm-7:05 pm

1 stop37h 40m

$847

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

jue. 10/2

12:50 pm-7:35 am

2 stops28h 45m

Ko Samui

jue. 10/9

8:45 am-8:40 pm

2 stops25h 55m

$873

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

sáb. 9/27

11:55 pm-6:30 pm

1 stop28h 35m

Ko Samui

lun. 10/6

7:25 pm-9:50 pm

1 stop40h 25m

$911

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

mié. 9/17

11:50 pm-7:35 am

2 stops41h 45m

$457

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

mié. 9/17

9:20 pm-7:50 am

1 stop20h 30m

$461

Los AngelesKo Samui

LAX - USM

LAXUSM

Los Angeles

jue. 10/2

11:30 am-9:35 pm

3 stops44h 05m

$514

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

Showing 1-10 of 13 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 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 agosto 20, 2025.

When flying from Riverside to Ko Samui, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 agosto 20, 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
1,232 reviews

Food

8.1

Boarding

8.4

Crew

8.6

Entertainment

8.0

Comfort

8.3

Overall

8.4

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
1,232 reviews
EVA Air
8.4
Very good
1,232 reviews

Food

8.1

Boarding

8.4

Crew

8.6

Entertainment

8.0

Comfort

8.3

Overall

8.4

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
1,347 reviews
EVA Air
8.4
Very good
1,232 reviews

Food

8.1

Boarding

8.4

Crew

8.6

Entertainment

8.0

Comfort

8.3

Overall

8.4

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 $707. 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.

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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Riverside to Ko Samui

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Suvarnabhumi flights
San Francisco to Suvarnabhumi flights
Ontario to Suvarnabhumi flights
Los Angeles to Don Mueang Intl flights
Santa Ana to Suvarnabhumi flights
Burbank to Suvarnabhumi flights
San Francisco to Don Mueang Intl flights
San Diego to Suvarnabhumi flights
San Jose to Suvarnabhumi flights
Oakland to Suvarnabhumi flights
Las Vegas to Suvarnabhumi flights
Long Beach to Suvarnabhumi flights
Los Angeles to Phuket City flights
San Francisco to Phuket City flights
San Francisco to Chiang Mai flights
Palm Springs to Suvarnabhumi flights
Sacramento to Suvarnabhumi flights
Los Angeles to Chiang Mai flights
Ontario to Phuket City flights
Reno to Suvarnabhumi flights
Santa Rosa to Suvarnabhumi flights
Fresno to Suvarnabhumi flights
Medford to Suvarnabhumi flights
San Jose to Phuket City flights
Burbank to Phuket City flights
Burbank to Chiang Mai flights
Ontario to Chiang Mai flights
San Francisco to Ko Samui flights
Oakland to Phuket City flights
Santa Ana to Chiang Mai flights
Oakland to Chiang Mai flights
San Jose to Chiang Mai flights
Los Angeles to Ko Samui flights
Las Vegas to Phuket City flights
Ontario to Don Mueang Intl flights
Los Angeles to Krabi flights
Sacramento to Phuket City flights
San Diego to Phuket City flights
Santa Ana to Phuket City flights
Long Beach to Phuket City flights
San Francisco to Krabi flights
Arcata to Suvarnabhumi flights
San Diego to Chiang Mai flights
San Francisco to Rayong flights
San Jose to Ko Samui flights
Santa Ana to Krabi flights

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 agosto 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Singapore AirlinesCheapest$756Average$1,196FlexibilityNo cancel feeOn-time81%
EVA AirCheapest$1,074Average$1,176FlexibilityNo cancel feeOn-time74%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.