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$1,106+ Cheap flights from Ontario (ONT) to Guam

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 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GUM
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap flight deals from Ontario to Guam

Cheapest flights from Ontario to Guam
Explore the most affordable flight options available from Ontario to Guam. 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 12/17. 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 12/286:00 amONT - GUM
2 stops19h 00mUnited Airlines
Thu 1/17:40 amGUM - ONT
2 stops22h 58mUnited Airlines
Deal found 12/17$2,928
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.
Fri 12/1910:42 amONT - GUM
2 stops38h 18mUnited Airlines
Thu 1/17:40 amGUM - ONT
2 stops22h 58mUnited Airlines
Deal found 12/15$2,950
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/196:40 amONT - GUM
2 stops22h 25mDelta
Sun 12/281:00 amGUM - ONT
2 stops34h 08mDelta
Deal found 12/15$3,076
This United Airlines deal was found by Cheapflights users on 12/16. 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 12/206:00 amONT - GUM
2 stops19h 00mUnited Airlines
Mon 12/227:40 amGUM - ONT
2 stops22h 58mUnited Airlines
Deal found 12/16$3,128
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.
Fri 12/196:00 amONT - GUM
2 stops19h 00mUnited Airlines
Sun 12/217:40 amGUM - ONT
2 stops22h 58mUnited Airlines
Deal found 12/15$3,178
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.
Thu 12/186:00 amONT - GUM
2 stops21h 45mUnited Airlines
Sat 12/207:40 amGUM - ONT
2 stops22h 58mUnited Airlines
Deal found 12/15$3,384
This United Airlines deal was found by Cheapflights users on 12/14. 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 12/286:00 amONT - GUM
2 stops19h 00mUnited Airlines
Sat 1/37:40 amGUM - ONT
2 stops20h 19mUnited Airlines
Deal found 12/14$3,478
This United Airlines deal was found by Cheapflights users on 12/14. 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.
Tue 12/166:00 amONT - GUM
2 stops18h 50mUnited Airlines
Wed 2/47:20 amGUM - ONT
2 stops33h 33mUnited Airlines
Deal found 12/14$3,848

Find flight deals from Ontario to Guam

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

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,106
(United Airlines)

Popular in

August

Cheapest in

February

Average price

$2,214
Provider with most accurate pricing for Los Angeles-Tamuning Guam Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Tamuning Guam Intl flights.
Search Deals
From Ontario to Guam
Search Deals
Highest demand for flights based on searches. 1% potential increase in price ($36 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($50 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 Ontario to Guam 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 Ontario to Guam that are best for you.

Fly from

Ontario

Fly to

Guam

Route

Depart

Return

Price

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Sat 2/28

1:53 pm-3:40 pm

2 stops55h 47m

Tamuning Guam Intl

Wed 3/4

7:40 am-8:50 pm

2 stops31h 10m

$1,106

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 3/19

6:00 am-11:05 pm

2 stops24h 05m

Tamuning Guam Intl

Wed 3/25

1:00 am-10:34 pm

2 stops38h 34m

$1,753

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Tue 2/17

7:30 am-2:35 pm

2 stops37h 05m

Tamuning Guam Intl

Mon 2/23

1:00 am-10:37 pm

2 stops39h 37m

$1,753

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 3/19

6:00 am-11:05 pm

2 stops24h 05m

Tamuning Guam Intl

Thu 3/26

1:00 am-11:54 pm

2 stops39h 54m

$1,803

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 1/19

6:00 am-11:05 pm

2 stops23h 05m

Tamuning Guam Intl

Sun 2/1

1:00 am-10:44 pm

2 stops39h 44m

$1,840

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Fri 3/20

6:00 am-11:05 pm

2 stops24h 05m

Tamuning Guam Intl

Fri 3/27

1:00 am-10:34 pm

2 stops38h 34m

$1,853

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Sat 3/21

6:00 am-11:05 pm

2 stops24h 05m

Tamuning Guam Intl

Fri 3/27

1:00 am-10:34 pm

2 stops38h 34m

$1,853

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 3/5

6:00 am-7:05 pm

2 stops19h 05m

Tamuning Guam Intl

Thu 3/12

7:25 am-12:48 pm

2 stops22h 23m

$1,868

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Tue 5/19

6:00 am-6:05 pm

2 stops19h 05m

Tamuning Guam Intl

Tue 5/26

7:05 am-12:20 pm

2 stops22h 15m

$1,868

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Tue 4/21

6:00 am-6:05 pm

2 stops19h 05m

Tamuning Guam Intl

Tue 4/28

7:05 am-9:55 am

2 stops19h 50m

$1,868

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 15 results
1
2

Best time to book a flight from Ontario to Guam

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

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

Currently, September is the cheapest month in which you can book a flight from Ontario to Guam (average of $467). Flying from Ontario to Guam in June is currently the most expensive (average of $1,986). 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.

Reviews of airlines servicing Guam

Get insights into the airlines that provide service to Guam. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Guam. Reviews last updated December 18, 2025.
Peruse reviews from past customers who have flown with United Airlines from Ontario to Guam to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,091 reviews

Entertainment

7.1

Crew

8.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
9,091 reviews
United Airlines
7.4
Good
9,091 reviews

Entertainment

7.1

Crew

8.1

Overall

7.4

Boarding

7.7

Food

6.6

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from Ontario to Guam. 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 from for flights from Ontario to Guam?

    Most people fly from Ontario (ONT) if they book a flight from Ontario to Guam. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

  • How long is the flight from Ontario to Guam?

    For as low as $1,753, United Airlines can have you in Guam from Ontario in 24h 05m. There are 6119 mi between Ontario and Guam. 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 Ontario to Guam that include hotel bookings?

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

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

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

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

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

    Currently, September is the cheapest month in which you can book a flight from Ontario to Guam (average of $467). Flying from Ontario to Guam in June is currently the most expensive (average of $1,986). 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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Top airline flying from Ontario to Guam

Discover the top airline that operate flights from Ontario to Guam. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,867Average$2,017FlexibilityNo cancel feeOn-time69%

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