HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Saint Thomas Island

$595+ Cheap flights from Ontario (ONT) to Saint Thomas Island (STT)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STT
Jul 5 — Jul 121
Sat 7/5
Sat 7/12
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Saint Thomas Island 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 Ontario to Saint Thomas Island

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Saint Thomas Island (STT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 30, 2025.

Round-trip from

$595
(American Airlines)

Popular in

November

Cheapest in

September

Average price

$885
From Ontario to Saint Thomas Island Cyril E King
Search Deals
Highest demand for flights based on searches. 26% potential increase in price ($292 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 14% potential price decrease ($99 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
Search Deals

Find flight deals from Ontario to Saint Thomas Island

Cheapest flights from Ontario to Saint Thomas Island
Explore the most affordable flight options available from Ontario to Saint Thomas Island. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 30, 2025.

This American Airlines deal was found by Cheapflights users on 6/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/187:16 pmONT - STT
2 stops14h 32mAmerican Airlines
Mon 9/221:40 pmSTT - ONT
2 stops11h 53mAmerican Airlines
Deal found 6/30$595
This Delta deal was found by Cheapflights users on 6/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1810:00 pmONT - STT
1 stop12h 33mDelta
Mon 9/222:43 pmSTT - ONT
1 stop10h 40mDelta
Deal found 6/30$617
This United Airlines deal was found by Cheapflights users on 6/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/76:38 pmONT - STT
2 stops15h 52mUnited Airlines
Sat 11/153:35 pmSTT - ONT
1 stop10h 00mUnited Airlines
Deal found 6/30$707
This United deal was found by Cheapflights users on 6/28. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/296:38 pmONT - STT
2 stops15h 23mMultiple Airlines
Fri 9/510:55 amSTT - ONT
2 stops13h 30mMultiple Airlines
Deal found 6/28$816

Cheapflights Fare Finder

Customize your flight search to find flights from Ontario to Saint Thomas Island 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 June 30, 2025.
Use the filters below to find and compare flights from Ontario to Saint Thomas Island that are best for you.

Fly from

Ontario

Fly to

Saint Thomas Island

Route

Depart

Return

Price

OntarioSaint Thomas Island

ONT - STT

ONTSTT

Ontario

Thu 9/18

7:16 pm-12:48 pm

2 stops14h 32m

Saint Thomas Island Cyril E King

Mon 9/22

1:40 pm-10:33 pm

2 stops11h 53m

$595

OntarioSaint Thomas Island

ONT - STT

ONTSTT

Ontario

Thu 9/18

10:00 pm-1:33 pm

1 stop12h 33m

Saint Thomas Island Cyril E King

Mon 9/22

2:43 pm-10:23 pm

1 stop10h 40m

$617

OntarioSaint Thomas Island

ONT - STT

ONTSTT

Ontario

Fri 11/7

6:38 pm-2:30 pm

2 stops15h 52m

Saint Thomas Island Cyril E King

Sat 11/15

3:35 pm-9:35 pm

1 stop10h 00m

$707

OntarioSaint Thomas Island

ONT - STT

ONTSTT

Ontario

Fri 8/29

6:38 pm-1:01 pm

2 stops15h 23m

Saint Thomas Island Cyril E King

Fri 9/5

10:55 am-9:25 pm

2 stops13h 30m

$816

OntarioSaint Thomas Island

ONT - STT

ONTSTT

Ontario

Thu 8/21

6:38 pm-1:01 pm

2 stops39h 23m

$786

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/29

Best time to book a flight from Ontario to Saint Thomas Island

Have a flexible travel schedule? Discover the best time to fly to Saint Thomas Island from Ontario 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 Ontario to Saint Thomas Island

What is the cheapest month to book a flight from Ontario to Saint Thomas Island?

Currently, September is the cheapest month in which you can book a flight from Ontario to Saint Thomas Island (average of $433). Flying from Ontario to Saint Thomas Island in June is currently the most expensive (average of $648). 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.

Reviews of airlines servicing Saint Thomas Island

Get insights into the airlines that provide service to Saint Thomas Island. 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 Saint Thomas Island. Reviews last updated June 30, 2025.
Read reviews from past customers who have flown Delta, United Airlines, and American Airlines from Ontario to Saint Thomas Island. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,969 reviews

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,969 reviews
Delta
8.0
Very good
7,969 reviews

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,852 reviews
Delta
8.0
Very good
7,969 reviews

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,969 reviews

Food

7.3

Entertainment

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Saint Thomas Island. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Ontario to Saint Thomas Island round-trip?

    Currently priced at $595, American Airlines will fly you from Ontario to Saint Thomas Island and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and United Airlines - these airlines can fly you to your destination from $617 and $707, respectively. Users have found that American Airlines is 25% cheaper than the other options available to this destination.

  • Can I find deals for flights from Ontario to Saint Thomas Island that include hotel bookings?

    Yes. In addition to deals on Ontario to Saint Thomas Island flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Saint Thomas Island?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Saint Thomas Island.

  • Can I find deals for business class flights from Ontario to Saint Thomas Island?

    Yes. Cheapflights offers flight deals from Ontario to Saint Thomas Island 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 Ontario to Saint Thomas Island?

    Currently, September is the cheapest month in which you can book a flight from Ontario to Saint Thomas Island (average of $433). Flying from Ontario to Saint Thomas Island in June is currently the most expensive (average of $648). 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 Ontario?

Book flights to Ontario if you plan to visit one of these locations
St. John

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 Ontario to Saint Thomas Island

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Saint Thomas Island flights
San Francisco to Saint Thomas Island flights
Burbank to Saint Thomas Island flights
Las Vegas to Saint Thomas Island flights
Los Angeles to Christiansted flights
San Diego to Saint Thomas Island flights
Sacramento to Saint Thomas Island flights
Sacramento to Christiansted flights
San Jose to Saint Thomas Island flights
San Diego to Christiansted flights
Oakland to Saint Thomas Island flights
San Francisco to Christiansted flights
Ontario to Christiansted flights
Santa Ana to Saint Thomas Island flights
Reno to Saint Thomas Island flights
Oakland to Christiansted flights
San Jose to Christiansted flights
Long Beach to Saint Thomas Island flights
Palm Springs to Christiansted flights
Long Beach to Christiansted flights
Santa Rosa to Saint Thomas Island flights
Yuma to Christiansted flights

Top 2 airlines flying from Ontario to Saint Thomas Island

Discover the top 2 airlines that operate flights from Ontario to Saint Thomas Island. 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 June 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$473Average$729FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$493Average$1,115FlexibilityNo cancel feeOn-time71%

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.