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Guam

$1,365+ 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 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GUM
Mar 6 — Mar 131
Fri 3/6
Fri 3/13
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 February 4, 2026.

This United Airlines deal was found by Cheapflights users on 2/1. 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 10/171:33 pm
ONT
-
GUM
2 stops57h 12m
United Airlines
Wed 10/217:10 am
GUM
-
ONT
3 stops27h 37m
United Airlines
Deal found 2/1$1,365
This Delta deal was found by Cheapflights users on 2/1. 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 5/67:00 am
ONT
-
GUM
2 stops23h 55m
Delta
Wed 5/273:00 am
GUM
-
ONT
2 stops36h 19m
Delta
Deal found 2/1$1,754
This Delta deal was found by Cheapflights users on 2/1. 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.
Sun 5/101:25 pm
ONT
-
GUM
2 stops41h 30m
Delta
Mon 5/255:00 pm
GUM
-
ONT
2 stops47h 34m
Delta
Deal found 2/1$1,763
This Delta deal was found by Cheapflights users on 2/1. 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 5/86:00 am
ONT
-
GUM
2 stops24h 55m
Delta
Mon 5/253:00 am
GUM
-
ONT
2 stops37h 34m
Delta
Deal found 2/1$1,804
This Delta deal was found by Cheapflights users on 2/1. 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.
Sun 5/101:25 pm
ONT
-
GUM
2 stops56h 50m
Delta
Fri 5/223:00 am
GUM
-
ONT
2 stops31h 10m
Delta
Deal found 2/1$1,813
This Delta deal was found by Cheapflights users on 2/1. 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 5/86:00 am
ONT
-
GUM
2 stops40h 15m
Delta
Fri 5/225:00 pm
GUM
-
ONT
2 stops41h 10m
Delta
Deal found 2/1$1,854
This United Airlines deal was found by Cheapflights users on 2/3. 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 9/16:00 am
ONT
-
GUM
2 stops19h 05m
United Airlines
Wed 9/97:10 am
GUM
-
ONT
2 stops22h 10m
United Airlines
Deal found 2/3$1,969
This United Airlines deal was found by Cheapflights users on 2/3. 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 7/106:00 am
ONT
-
GUM
2 stops19h 05m
United Airlines
Fri 7/177:05 am
GUM
-
ONT
2 stops22h 15m
United Airlines
Deal found 2/3$2,069
This United Airlines deal was found by Cheapflights users on 2/3. 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 3/86:15 am
ONT
-
GUM
2 stops19h 35m
United Airlines
Sun 3/157:25 am
GUM
-
ONT
2 stops22h 23m
United Airlines
Deal found 2/3$2,279
This United Airlines deal was found by Cheapflights users on 2/2. 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 3/16:09 am
ONT
-
GUM
2 stops18h 56m
United Airlines
Tue 3/177:25 am
GUM
-
ONT
2 stops21h 53m
United Airlines
Deal found 2/2$2,429
This United Airlines deal was found by Cheapflights users on 2/1. 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 2/166:10 am
ONT
-
GUM
2 stops18h 55m
United Airlines
Sat 2/2812:30 pm
GUM
-
ONT
2 stops18h 17m
United Airlines
Deal found 2/1$2,456

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 February 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,754
(Delta)

One-way from

$1,673
(United Airlines)

Popular in

August

Cheapest in

February

Average price

$1,849
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
One-way flight from Ontario to Guam
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($171 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($48 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
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 February 4, 2026.
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

Wed 5/6

7:00 am-11:55 pm

2 stops23h 55m

Tamuning Guam Intl

Mon 5/25

3:00 am-11:34 pm

2 stops37h 34m

$1,754

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 5/11

6:00 am-3:15 pm

2 stops40h 15m

Tamuning Guam Intl

Sun 5/24

5:00 pm-11:34 pm

2 stops47h 34m

$1,754

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 5/7

6:00 am-3:15 pm

2 stops40h 15m

Tamuning Guam Intl

Tue 5/26

3:00 am-10:19 pm

2 stops36h 19m

$1,754

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 5/7

6:48 am-3:15 pm

2 stops39h 27m

Tamuning Guam Intl

Tue 5/26

5:00 pm-10:19 pm

2 stops46h 19m

$1,754

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Tue 5/12

6:00 am-3:15 pm

2 stops40h 15m

Tamuning Guam Intl

Mon 5/25

3:00 am-11:34 pm

2 stops37h 34m

$1,754

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Tue 5/12

6:00 am-3:15 pm

2 stops40h 15m

Tamuning Guam Intl

Wed 5/27

3:00 am-10:19 pm

2 stops36h 19m

$1,754

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 5/11

6:00 am-3:15 pm

2 stops40h 15m

Tamuning Guam Intl

Wed 5/27

5:00 pm-5:10 pm

2 stops41h 10m

$1,754

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Wed 5/6

7:00 am-11:55 pm

2 stops23h 55m

Tamuning Guam Intl

Wed 5/27

3:00 am-10:19 pm

2 stops36h 19m

$1,754

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 5/11

6:00 am-11:55 pm

2 stops24h 55m

Tamuning Guam Intl

Sun 5/24

3:00 am-10:19 pm

2 stops36h 19m

$1,754

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 5/7

6:00 am-11:55 pm

2 stops24h 55m

Tamuning Guam Intl

Wed 5/27

3:00 am-10:19 pm

2 stops36h 19m

$1,754

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/3

Showing 1-10 of 13 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, February is the cheapest month in which you can book a flight from Ontario to Guam (average of $483). Flying from Ontario to Guam in June is currently the most expensive (average of $1,988). 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 February 4, 2026.
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
9,236 reviews

Overall

7.4

Comfort

7.3

Crew

8.1

Boarding

7.7

Food

6.6

Entertainment

7.1

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
9,236 reviews
United Airlines
7.4
Good
9,236 reviews

Overall

7.4

Comfort

7.3

Crew

8.1

Boarding

7.7

Food

6.6

Entertainment

7.1

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 $1,754, Delta can have you in Guam from Ontario in 23h 55m. There are 6119 mi between Ontario and Guam.

  • 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, February is the cheapest month in which you can book a flight from Ontario to Guam (average of $483). Flying from Ontario to Guam in June is currently the most expensive (average of $1,988). 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 February 4, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,867Average$2,017FlexibilityNo cancel feeOn-time69%

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