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$698+ 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 12/16. Fares are subject to change and may not be available on all flights or dates of travel.
GUM — ONT
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheap flight deals from Tamuning to Ontario

Best flights from Tamuning to Ontario
Discover carefully curated flight deals from Tamuning to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 12, 2025.

This United Airlines deal was found by Cheapflights users on 12/10. 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 1/187:40 amGUM - ONT
2 stops21h 38mUnited Airlines
Mon 1/266:00 amONT - GUM
2 stops21h 45mUnited Airlines
Deal found 12/10$1,419
This United Airlines deal was found by Cheapflights users on 12/10. 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 4/47:05 amGUM - ONT
2 stops27h 42mUnited Airlines
Sun 4/196:53 pmONT - GUM
2 stops40h 32mUnited Airlines
Deal found 12/10$1,430
This United Airlines deal was found by Cheapflights users on 12/9. 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.
Thu 3/57:05 amGUM - ONT
2 stops33h 52mUnited Airlines
Mon 3/96:37 pmONT - GUM
2 stops31h 13mUnited Airlines
Deal found 12/9$1,435

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 December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,419
(United Airlines)

One-way from

$698
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$1,768
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. 4% potential increase in price ($63 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($23 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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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 December 12, 2025.
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

Sun 1/18

7:40 am-11:18 am

2 stops21h 38m

Ontario

Mon 1/26

6:00 am-9:45 pm

2 stops21h 45m

$1,419

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Sat 4/4

7:05 am-5:47 pm

2 stops27h 42m

Ontario

Sun 4/19

6:53 pm-4:25 am

2 stops40h 32m

$1,430

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Thu 3/5

7:05 am-10:57 pm

2 stops33h 52m

Ontario

Mon 3/9

6:37 pm-6:50 pm

2 stops31h 13m

$1,435

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Tue 12/16

2:15 am-6:33 pm

3 stops34h 18m

$698

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Wed 12/17

3:30 am-12:14 am

2 stops38h 44m

$732

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Tue 12/16

4:15 pm-6:33 pm

3 stops44h 18m

$755

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Sun 12/21

2:15 am-10:08 pm

3 stops37h 53m

$895

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Sat 12/20

4:15 pm-10:08 pm

3 stops47h 53m

$896

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Sat 12/20

2:15 am-12:14 am

3 stops39h 59m

$924

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Thu 12/18

2:15 am-10:08 pm

3 stops37h 53m

$967

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 14 results
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Compare providers for flights from Tamuning to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Tamuning to Ontario in December.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Tamuning-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Tamuning-Ontario flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 $1,646). 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 21h 38m. 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 $1,646). 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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