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Ontario

$1,382+ Cheap flights from Guam 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 10/5. Fares are subject to change and may not be available on all flights or dates of travel.
GUM — ONT
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheap flight deals from Guam to Ontario

Keep the following information in mind while searching for Guam to Ontario flight deals. Data was last updated September 15, 2025.

Round-trip from

$1,382
(United Airlines)

Popular in

December

Cheapest in

October

Average price

$1,379
From Guam to Ontario
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($97 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
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Find 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 September 15, 2025.

This United Airlines deal was found by Cheapflights users on 9/14. 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 10/55:00 pmGUM - ONT
2 stops41h 40mUnited Airlines
Mon 10/139:36 amONT - GUM
2 stops39h 29mUnited Airlines
Deal found 9/14$1,382
This United Airlines deal was found by Cheapflights users on 9/14. 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 9/14$1,435
This United Airlines deal was found by Cheapflights users on 9/14. 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 11/17:20 amGUM - ONT
2 stops47h 17mUnited Airlines
Sun 1/111:53 pmONT - GUM
2 stops35h 12mUnited Airlines
Deal found 9/14$1,528
This Delta deal was found by Cheapflights users on 9/14. 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 9/14$1,717
This Delta deal was found by Cheapflights users on 9/14. 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.
Sat 10/41:55 amGUM - ONT
2 stops38h 47mDelta
Mon 10/136:00 amONT - GUM
2 stops25h 10mDelta
Deal found 9/14$1,819

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 September 15, 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

Sun 10/5

5:00 pm-5:40 pm

2 stops41h 40m

Ontario

Mon 10/13

9:36 am-6:05 pm

2 stops39h 29m

$1,382

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 11/1

7:20 am-1:37 pm

2 stops47h 17m

Ontario

Sun 1/11

1:53 pm-7:05 pm

2 stops35h 12m

$1,528

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Wed 11/12

1:00 am-10:55 pm

2 stops39h 55m

Ontario

Mon 11/17

6:00 am-2:35 pm

2 stops38h 35m

$1,717

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Sat 10/4

1:55 am-11:42 pm

2 stops38h 47m

Ontario

Mon 10/13

6:00 am-12:10 am

2 stops25h 10m

$1,819

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

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, August is the cheapest month in which you can book a flight from Guam to Ontario (average of $246). Flying from Guam 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 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 and Delta can get you from Guam to Ontario in just under 39h 55m. Your travel time can differ by up to 1h 45m. The distance between Guam and Ontario is about 6119 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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, August is the cheapest month in which you can book a flight from Guam to Ontario (average of $246). Flying from Guam 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.

See more FAQs

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