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$1,257+ Cheap flights from Guam 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 12/22. Fares are subject to change and may not be available on all flights or dates of travel.
GUM — ONT
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap flight deals from Guam to Ontario

Cheapest flights from Guam to Ontario
Explore the most affordable flight options available from Guam to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

This United Airlines deal was found by Cheapflights users on 12/15. 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 12/227:40 amGUM - ONT
2 stops28h 03mUnited Airlines
Wed 1/76:00 amONT - GUM
2 stops39h 40mUnited Airlines
Deal found 12/15$1,677

Find flight deals from Guam to Ontario

Keep the following information in mind while searching for Guam to Ontario flight deals. Data was last updated December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,377
(United Airlines)

One-way from

$1,257
(Delta)

Popular in

December

Cheapest in

September

Average price

$1,768
Provider with most accurate pricing for Tamuning Guam Intl-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Tamuning Guam Intl-Los Angeles flights.
Search Deals
From Guam to Ontario
Search Deals
One-way flight from Guam to Ontario
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($63 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Guam 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 18, 2025.
Use the filters below to find and compare flights from Guam to Ontario that are best for you.

Fly from

Guam

Fly to

Ontario

Route

Depart

Return

Price

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Thu 5/14

7:05 am-5:47 pm

2 stops27h 42m

Ontario

Thu 5/21

6:00 am-6:05 pm

2 stops19h 05m

$1,377

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Mon 5/11

7:05 am-10:52 pm

2 stops32h 47m

Ontario

Thu 5/21

6:00 am-6:05 pm

2 stops19h 05m

$1,377

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Mon 5/11

7:05 am-5:47 pm

2 stops27h 42m

Ontario

Wed 5/20

6:00 am-6:05 pm

2 stops19h 05m

$1,377

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Wed 5/13

7:05 am-5:47 pm

2 stops27h 42m

Ontario

Wed 5/20

6:00 am-6:05 pm

2 stops19h 05m

$1,377

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Mon 5/11

7:05 am-5:47 pm

2 stops27h 42m

Ontario

Tue 5/19

6:00 am-6:05 pm

2 stops19h 05m

$1,377

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Wed 5/13

7:05 am-5:47 pm

2 stops27h 42m

Ontario

Thu 5/21

6:00 am-6:05 pm

2 stops19h 05m

$1,377

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Mon 5/11

7:05 am-5:47 pm

2 stops27h 42m

Ontario

Mon 5/18

6:00 am-6:05 pm

2 stops19h 05m

$1,377

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Tue 5/12

7:05 am-5:47 pm

2 stops27h 42m

Ontario

Thu 5/21

6:00 am-6:05 pm

2 stops19h 05m

$1,377

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

Mon 12/22

4:50 pm-11:54 pm

2 stops49h 04m

$1,257

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Showing 1-10 of 14 results
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Best time to book a flight from Guam to Ontario

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

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

Currently, October is the cheapest month in which you can book a flight from Guam to Ontario (average of $1,079). Flying from Guam 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 Guam to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from Guam?

    For a flight from Guam to Ontario, you will be flying into Ontario. Ontario (ONT) is just 3.1 mi from the center of the city.

  • How long is the flight from Guam to Ontario?

    United Airlines can get you from Guam to Ontario in just under 27h 42m. Your travel time can differ by up to . The distance between Guam and Ontario is about 6119 mi.

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

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

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

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

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

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

    Currently, October is the cheapest month in which you can book a flight from Guam to Ontario (average of $1,079). Flying from Guam 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.

See more FAQs

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