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$1,257+ Cheap flights from Tamuning (GUM) to Ontario (ONT)

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 4/17. Fares are subject to change and may not be available on all flights or dates of travel.
GUM — ONT
Feb 26 — Mar 51
Thu 2/26
Thu 3/5
1 adult, Economy
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Cheap flight deals from Tamuning to Ontario

Cheapest flights from Tamuning to Ontario
Explore the most affordable flight options available from Tamuning to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 27, 2026.

This United Airlines deal was found by Cheapflights users on 1/26. 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.
Mon 2/167:40 am
GUM
-
ONT
2 stops33h 17m
United Airlines
Tue 2/246:10 am
ONT
-
GUM
2 stops28h 10m
United Airlines
Deal found 1/26$1,381
This United Airlines deal was found by Cheapflights users on 1/25. 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.
Sat 2/287:20 am
GUM
-
ONT
2 stops28h 21m
United Airlines
Wed 3/116:15 am
ONT
-
GUM
2 stops19h 35m
United Airlines
Deal found 1/25$1,428
This United Airlines deal was found by Cheapflights users on 1/24. 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.
Sun 2/157:05 am
GUM
-
ONT
2 stops33h 52m
United Airlines
Sat 2/211:53 pm
ONT
-
GUM
2 stops35h 12m
United Airlines
Deal found 1/24$1,478
This United Airlines deal was found by Cheapflights users on 1/27. 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 1/307:05 am
GUM
-
ONT
2 stops28h 38m
United Airlines
Wed 2/46:00 am
ONT
-
GUM
2 stops19h 05m
United Airlines
Deal found 1/27$1,953

Find flight deals from Tamuning to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Tamuning (GUM) to Ontario (ONT). 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 January 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,381
(United Airlines)

One-way from

$1,257
(Delta)

Popular in

December

Cheapest in

September

Average price

$1,445
Provider with most accurate pricing for Tamuning Guam Intl-Ontario flight deals.
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Provider most trusted by Cheapflights users for Tamuning Guam Intl-Ontario flights.
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From Tamuning Guam Intl to Ontario
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One-way flight from Tamuning Guam Intl to Ontario
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Highest demand for flights based on searches. 5% potential increase in price ($82 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($34 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Tamuning to Ontario 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 January 27, 2026.
Use the filters below to find and compare flights from Tamuning to Ontario that are best for you.

Fly from

Tamuning

Fly to

Ontario

Route

Depart

Return

Price

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Mon 4/6

7:05 am-12:14 pm

2 stops22h 09m

Ontario

Mon 4/13

6:49 pm-4:25 am

2 stops40h 36m

$1,381

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Mon 2/16

7:40 am-10:57 pm

2 stops33h 17m

Ontario

Tue 2/24

6:10 am-4:20 am

2 stops28h 10m

$1,381

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Sat 2/28

7:20 am-5:41 pm

2 stops28h 21m

Ontario

Wed 3/11

6:15 am-6:50 pm

2 stops19h 35m

$1,428

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Sun 2/15

7:05 am-10:57 pm

2 stops33h 52m

Ontario

Sat 2/21

1:53 pm-7:05 pm

2 stops35h 12m

$1,478

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Fri 4/17

3:00 am-10:43 pm

2 stops36h 43m

$1,257

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Mon 4/13

3:00 am-10:37 pm

2 stops36h 37m

$1,257

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Sun 4/12

5:00 pm-5:15 pm

2 stops41h 15m

$1,257

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Sun 4/12

3:00 am-10:37 pm

2 stops36h 37m

$1,257

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Wed 4/15

3:00 am-5:15 pm

2 stops31h 15m

$1,257

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Tue 4/14

3:00 am-10:37 pm

2 stops36h 37m

$1,257

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/25

Showing 1-10 of 16 results
1
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  • Most accurate provider: When it comes to deals on Tamuning-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Tamuning-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Tamuning-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Tamuning-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Tamuning-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Tamuning to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Tamuning 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 Tamuning to Ontario

What is the cheapest month to book a flight from Tamuning to Ontario?

Currently, October is the cheapest month in which you can book a flight from Tamuning to Ontario (average of $1,079). Flying from Tamuning to Ontario in December is currently the most expensive (average of $1,655). 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.

Related info for your journey

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

  • How long is the flight from Tamuning to Ontario?

    United Airlines can get you from Tamuning to Ontario in just under 22h 09m. Your travel time can differ by up to . Tamuning and Ontario are separated by a distance of 6119 mi.

  • Can I find deals for flights from Tamuning to Ontario that include hotel bookings?

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

  • How can I find direct flights from Tamuning to Ontario?

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

  • Can I find deals for business class flights from Tamuning to Ontario?

    Yes. Cheapflights offers flight deals from Tamuning to Ontario 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 Tamuning to Ontario?

    Currently, October is the cheapest month in which you can book a flight from Tamuning to Ontario (average of $1,079). Flying from Tamuning to Ontario in December is currently the most expensive (average of $1,655). 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.

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