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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 12/15. Fares are subject to change and may not be available on all flights or dates of travel.
GUM — ONT
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
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 September 11, 2025.

Round-trip from

$1,435
(United Airlines)

One-way from

$1,257
(Delta)

Popular in

December

Cheapest in

October

Average price

$1,477
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 ($77 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/10. 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.
Thu 11/137:05 amGUM - ONT
2 stops28h 29mUnited Airlines
Mon 11/171:40 pmONT - GUM
2 stops35h 10mUnited Airlines
Deal found 9/10$1,435
This United Airlines deal was found by Cheapflights users on 9/10. 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 10/257:20 amGUM - ONT
2 stops32h 32mUnited Airlines
Sat 11/16:38 pmONT - GUM
2 stops55h 12mUnited Airlines
Deal found 9/10$1,439
This Delta deal was found by Cheapflights users on 9/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/241:55 amGUM - ONT
2 stops37h 46mDelta
Sat 11/17:35 amONT - GUM
2 stops38h 00mDelta
Deal found 9/10$1,492
This Delta deal was found by Cheapflights users on 9/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/121:00 amGUM - ONT
2 stops39h 55mDelta
Mon 11/176:00 amONT - GUM
2 stops38h 35mDelta
Deal found 9/10$1,717

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 September 11, 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

Thu 11/13

7:05 am-5:34 pm

2 stops28h 29m

Ontario

Mon 11/17

1:40 pm-6:50 pm

2 stops35h 10m

$1,435

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Sat 10/25

7:20 am-10:52 pm

2 stops32h 32m

Ontario

Sat 11/1

6:38 pm-6:50 pm

2 stops55h 12m

$1,439

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Fri 10/24

1:55 am-10:41 pm

2 stops37h 46m

Ontario

Sat 11/1

7:35 am-2:35 pm

2 stops38h 00m

$1,492

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Wed 11/12

1:00 am-10:55 pm

2 stops39h 55m

Ontario

Mon 11/17

6:45 am-11:05 pm

2 stops22h 20m

$1,717

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Mon 12/15

1:00 am-10:47 pm

2 stops39h 47m

$1,257

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Thu 12/18

1:00 am-10:47 pm

2 stops39h 47m

$1,257

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Sat 12/13

1:00 am-11:59 pm

2 stops40h 59m

$1,257

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Sun 12/14

1:00 am-10:47 pm

2 stops39h 47m

$1,257

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Tue 12/16

1:00 am-10:47 pm

2 stops39h 47m

$1,257

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Wed 12/17

1:00 am-10:47 pm

2 stops39h 47m

$1,257

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 12 results
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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, August is the cheapest month in which you can book a flight from Tamuning to Ontario (average of $246). Flying from Tamuning to Ontario in March is currently the most expensive (average of $328). 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 and Delta can get you from Tamuning to Ontario in just under 28h 29m. Your travel time can differ by up to 9h 17m. Tamuning and Ontario are separated by a distance of 6119 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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, August is the cheapest month in which you can book a flight from Tamuning to Ontario (average of $246). Flying from Tamuning to Ontario in March is currently the most expensive (average of $328). 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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