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$1,377+ Cheap flights from Tamuning (GUM) to Ontario (ONT)

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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
GUM — ONT
nov. 27 — dic. 41
jue. 11/27
jue. 12/4
1 adult, Economy
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Cheap 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 octubre 28, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,377
(United Airlines)

Popular in

December

Cheapest in

September

Average price

$1,429
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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Highest demand for flights based on searches. 3% potential increase in price ($54 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($22 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find 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 octubre 28, 2025.

This United Airlines deal was found by Cheapflights users on 10/27. 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.
jue. 12/47:05 amGUM - ONT
2 stops28h 32mUnited Airlines
jue. 12/116:00 amONT - GUM
2 stops18h 50mUnited Airlines
Deal found 10/27$1,377
This United Airlines deal was found by Cheapflights users on 10/28. 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 Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/75:00 pmGUM - ONT
2 stops37h 17mUnited Airlines
lun. 12/296:39 pmONT - GUM
2 stops30h 21mUnited Airlines
Deal found 10/28$1,492
This United Airlines deal was found by Cheapflights users on 10/26. 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.
vie. 12/267:05 amGUM - ONT
2 stops33h 36mUnited Airlines
sáb. 1/101:53 pmONT - GUM
2 stops35h 12mUnited Airlines
Deal found 10/26$1,677

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 octubre 28, 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

jue. 12/4

7:05 am-5:37 pm

2 stops28h 32m

Ontario

jue. 12/11

6:00 am-6:50 pm

2 stops18h 50m

$1,377

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

jue. 4/23

7:05 am-6:00 pm

2 stops27h 55m

Ontario

lun. 4/27

6:30 pm-6:05 pm

2 stops30h 35m

$1,450

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

lun. 1/12

7:40 am-12:17 pm

2 stops22h 37m

Ontario

lun. 1/19

6:00 am-4:20 am

2 stops28h 20m

$1,481

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

dom. 12/7

5:00 pm-12:17 pm

2 stops37h 17m

Ontario

lun. 12/29

6:39 pm-7:00 pm

2 stops30h 21m

$1,492

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

vie. 12/26

7:05 am-10:41 pm

2 stops33h 36m

Ontario

sáb. 1/10

1:53 pm-7:05 pm

2 stops35h 12m

$1,677

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

lun. 11/3

7:40 am-12:37 pm

2 stops22h 57m

$1,390

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

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 October.
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 August is currently the most expensive (average of $1,586). 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 28h 32m. 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 August is currently the most expensive (average of $1,586). 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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