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Cheap flights from Ontario to Saint Thomas Island from $535

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Saint Thomas Island departing on 1/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Ontario to Saint Thomas Island

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
6:37 pm - 2:28 pm
ONT
-
STT
15h 51m2 stops
Multiple Airlines Logo
3:57 pm - 9:23 pm
STT
-
ONT
33h 26m2 stops
$535Multiple Airlines
Sun, Jan 4 - Sun, Jan 11
American Airlines Logo
5:06 pm - 12:10 pm
ONT
-
STT
15h 04m2 stops
American Airlines Logo
4:29 pm - 10:49 pm
STT
-
ONT
10h 20m1 stop
$595American Airlines
Wed, Feb 25 - Mon, Mar 2
American Airlines Logo
8:03 pm - 2:50 pm
ONT
-
STT
15h 47m2 stops
American Airlines Logo
11:45 am - 7:48 pm
STT
-
ONT
11h 03m1 stop
$695American Airlines
Wed, May 27 - Tue, Jun 2
United Airlines Logo
11:59 pm - 4:18 pm
ONT
-
STT
12h 19m1 stop
United Airlines Logo
2:05 pm - 10:25 pm
STT
-
ONT
11h 20m1 stop
$712United Airlines
Fri, Mar 6 - Mon, Mar 9
American Airlines Logo
8:03 pm - 2:50 pm
ONT
-
STT
15h 47m2 stops
American Airlines Logo
1:45 pm - 9:10 am
STT
-
ONT
22h 25m2 stops
$741American Airlines
Wed, May 27 - Tue, Jun 2
United Airlines Logo
6:53 pm - 3:43 pm
ONT
-
STT
17h 50m2 stops
United Airlines Logo
4:45 pm - 12:20 pm
STT
-
ONT
22h 35m2 stops
$808United Airlines
Wed, May 27 - Tue, Jun 2
United Airlines Logo
11:59 pm - 4:18 pm
ONT
-
STT
12h 19m1 stop
United Airlines Logo
12:02 pm - 10:25 pm
STT
-
ONT
13h 23m2 stops
$815United Airlines
Fri, Mar 6 - Mon, Mar 9
United Airlines Logo
6:39 pm - 2:30 pm
ONT
-
STT
15h 51m2 stops
United Airlines Logo
3:05 pm - 11:18 am
STT
-
ONT
24h 13m2 stops
$826United Airlines
Fri, Jan 16 - Thu, Jan 22
Southwest Logo
6:00 pm - 1:20 pm
ONT
-
STT
16h 20m2 stops
Southwest Logo
2:45 pm - 11:40 pm
STT
-
ONT
11h 55m2 stops
$839Southwest
Mon, Jun 1 - Sun, Jun 7
United Airlines Logo
6:37 pm - 4:18 pm
ONT
-
STT
17h 41m2 stops
United Airlines Logo
1:02 pm - 8:50 pm
STT
-
ONT
35h 48m2 stops
$865United Airlines
Sun, Feb 22 - Thu, Feb 26

United Airlines flights from Ontario to Saint Thomas Island

Our best United Airlines deals on Ontario to Saint Thomas Island flight tickets
United Airlines
May 27
ONT6:53 pmOntario
17h 50m
2 stops
STT3:43 pmSaint Thomas Island Cyril E King
Jun 2
STT4:45 pmSaint Thomas Island Cyril E King
22h 35m
2 stops
ONT12:20 pmOntario
$808
Find similar
United Airlines
Jan 16
ONT6:39 pmOntario
15h 51m
2 stops
STT2:30 pmSaint Thomas Island Cyril E King
Jan 22
STT3:05 pmSaint Thomas Island Cyril E King
24h 13m
2 stops
ONT11:18 amOntario
$826
Find similar
United Airlines
Feb 22
ONT6:37 pmOntario
17h 41m
2 stops
STT4:18 pmSaint Thomas Island Cyril E King
Feb 26
STT1:02 pmSaint Thomas Island Cyril E King
35h 48m
2 stops
ONT8:50 pmOntario
$865
Find similar

American Airlines flights from Ontario to Saint Thomas Island

Our best American Airlines deals on Ontario to Saint Thomas Island flight tickets
American Airlines
Feb 25
ONT7:50 pmOntario
13h 46m
2 stops
STT1:36 pmSaint Thomas Island Cyril E King
Mar 2
STT12:50 pmSaint Thomas Island Cyril E King
13h 14m
2 stops
ONT10:04 pmOntario
$595
Find similar
American Airlines
May 27
ONT8:03 pmOntario
15h 47m
2 stops
STT2:50 pmSaint Thomas Island Cyril E King
Jun 2
STT11:45 amSaint Thomas Island Cyril E King
11h 03m
1 stop
ONT7:48 pmOntario
$695
Find similar
American Airlines
May 27
ONT8:03 pmOntario
15h 47m
2 stops
STT2:50 pmSaint Thomas Island Cyril E King
Jun 2
STT1:45 pmSaint Thomas Island Cyril E King
22h 25m
2 stops
ONT9:10 amOntario
$741
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated December 15, 2025.
Use the filters below to find and compare flights from Ontario to Saint Thomas Island that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioSaint Thomas Island

ONT - STT

ONTSTT

Ontario

Sun 1/4

6:37 pm-2:28 pm

2 stops15h 51m

Saint Thomas Island Cyril E King

Sun 1/11

3:57 pm-9:23 pm

2 stops33h 26m

$535

OntarioSaint Thomas Island

ONT - STT

ONTSTT

Ontario

Wed 2/25

5:06 pm-12:10 pm

2 stops15h 04m

Saint Thomas Island Cyril E King

Mon 3/2

4:29 pm-10:49 pm

1 stop10h 20m

$595

OntarioSaint Thomas Island

ONT - STT

ONTSTT

Ontario

Wed 5/27

8:03 pm-2:50 pm

2 stops15h 47m

Saint Thomas Island Cyril E King

Tue 6/2

11:45 am-7:48 pm

1 stop11h 03m

$695

OntarioSaint Thomas Island

ONT - STT

ONTSTT

Ontario

Fri 3/6

11:59 pm-4:18 pm

1 stop12h 19m

Saint Thomas Island Cyril E King

Mon 3/9

2:05 pm-10:25 pm

1 stop11h 20m

$712

OntarioSaint Thomas Island

ONT - STT

ONTSTT

Ontario

Wed 5/27

8:03 pm-2:50 pm

2 stops15h 47m

Saint Thomas Island Cyril E King

Tue 6/2

1:45 pm-9:10 am

2 stops22h 25m

$741

OntarioSaint Thomas Island

ONT - STT

ONTSTT

Ontario

Wed 5/27

6:53 pm-3:43 pm

2 stops17h 50m

Saint Thomas Island Cyril E King

Tue 6/2

4:45 pm-12:20 pm

2 stops22h 35m

$808

OntarioSaint Thomas Island

ONT - STT

ONTSTT

Ontario

Fri 3/6

11:59 pm-4:18 pm

1 stop12h 19m

Saint Thomas Island Cyril E King

Mon 3/9

12:02 pm-10:25 pm

2 stops13h 23m

$815

OntarioSaint Thomas Island

ONT - STT

ONTSTT

Ontario

Fri 1/16

6:39 pm-2:30 pm

2 stops15h 51m

Saint Thomas Island Cyril E King

Thu 1/22

3:05 pm-11:18 am

2 stops24h 13m

$826

OntarioSaint Thomas Island

ONT - STT

ONTSTT

Ontario

Mon 6/1

6:00 pm-1:20 pm

2 stops16h 20m

Saint Thomas Island Cyril E King

Sun 6/7

2:45 pm-11:40 pm

2 stops11h 55m

$839

OntarioSaint Thomas Island

ONT - STT

ONTSTT

Ontario

Sun 2/22

6:37 pm-4:18 pm

2 stops17h 41m

Saint Thomas Island Cyril E King

Thu 2/26

1:02 pm-8:50 pm

2 stops35h 48m

$865

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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See travel insights to Saint Thomas Island from

How to get the cheapest flight ticket from Ontario to Saint Thomas Island

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Saint Thomas Island?

On average, the least expensive day to fly to Saint Thomas Island from Ontario is on a Monday. momondo users have found tickets for Monday departures for as low as $531. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to Saint Thomas Island for around $721.

What is the cheapest time of day to depart on your flight to Saint Thomas Island?

The cheapest time of day to fly to Saint Thomas Island is in the afternoon when flights can be purchased for as low as $353. Flights to Saint Thomas Island are more costly in the evening, with an average ticket price of $669. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

When to book flights from Ontario to Saint Thomas Island

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Saint Thomas Island according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Saint Thomas Island (ONT to STT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Saint Thomas Island

Fastest flight time

10h 09m

Direct flights

None
The fastest flight from Ontario to Saint Thomas Island takes 10h 09m
There are no direct flights from Ontario to Saint Thomas Island. There are no popular flight routes from Ontario to Saint Thomas Island.
Search flight deals

  • How far is Ontario to Saint Thomas Island Cyril E King by plane?

    Ontario and Saint Thomas Island Cyril E King are 3401.6 mi apart from one another. A reasonable flight in good conditions will take 10h 09m.

  • When did momondo last update prices for flights from Ontario Airport to Saint Thomas Island Cyril E King Airport?

    Prices for flights from Ontario Airport to Saint Thomas Island Cyril E King Airport are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to Saint Thomas Island Cyril E King Airport?

  • How old do you have to be to fly from Ontario Airport to Saint Thomas Island Cyril E King Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Ontario Airport to Saint Thomas Island Cyril E King Airport.

  • What documentation or ID do you need to fly to Saint Thomas Island Cyril E King Airport?

    The necessary travel and health documents for your Saint Thomas Island Cyril E King Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Ontario to Saint Thomas Island?

Best airlines flying from Ontario to Saint Thomas Island

Compare and see reviews for airlines that fly from Ontario to Saint Thomas Island with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $567Free CancellationRating
7.2
11,051 reviews
Search American Airlines flights

Traveling to a place near Saint Thomas Island?

Book flights to Saint Thomas Island if you plan to visit one of these locations
St. John

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Saint Thomas Island?

It is quick and easy to find Ontario to Saint Thomas Island flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Saint Thomas Island that suits you.

Can I find flights from Ontario to Saint Thomas Island with flexible booking policies on momondo?

Yes. All flights to Saint Thomas Island from Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Ontario to Saint Thomas Island?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Saint Thomas Island from Ontario.

I’m not ready to book a flight from Ontario to Saint Thomas Island right now. Can momondo alert me if prices change?

Price alerts on flights to Saint Thomas Island from Ontario are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Saint Thomas Island trip

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