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$707+ Cheap flights from Ontario (ONT) to Guam

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 3/8. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GUM
oct. 15 — oct. 221
mié. 10/15
mié. 10/22
1 adult, Economy
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Cheap flight deals from Ontario to Guam

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

Round-trip from

$1,917
(United Airlines)

One-way from

$707
(Kiwi.com)

Popular in

August

Cheapest in

February

Average price

$1,853
From Ontario to Guam
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One-way flight from Ontario to Guam
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Highest demand for flights based on searches. 1% potential increase in price ($42 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($53 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 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 septiembre 15, 2025.

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.
jue. 10/26:00 amONT - GUM
2 stops40h 15mDelta
dom. 10/51:55 amGUM - ONT
2 stops37h 46mDelta
Deal found 9/14$2,115
This United Airlines deal was found by Cheapflights users on 9/15. 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.
mar. 11/46:00 amONT - GUM
2 stops18h 50mUnited Airlines
mié. 11/121:00 pmGUM - ONT
2 stops17h 37mUnited Airlines
Deal found 9/15$2,205
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.
dom. 11/306:00 amONT - GUM
2 stops18h 50mUnited Airlines
dom. 1/111:00 pmGUM - ONT
2 stops17h 14mUnited Airlines
Deal found 9/14$2,215
This United Airlines deal was found by Cheapflights users on 9/15. 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.
dom. 11/166:00 amONT - GUM
2 stops18h 50mUnited Airlines
vie. 11/211:00 pmGUM - ONT
2 stops17h 37mUnited Airlines
Deal found 9/15$2,305
This United Airlines deal was found by Cheapflights users on 9/13. 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.
jue. 12/46:00 amONT - GUM
2 stops18h 50mUnited Airlines
dom. 1/47:40 amGUM - ONT
2 stops31h 27mUnited Airlines
Deal found 9/13$2,587
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.
jue. 10/25:05 amONT - GUM
2 stops23h 45mUnited Airlines
lun. 10/67:10 amGUM - ONT
2 stops27h 30mUnited Airlines
Deal found 9/14$2,805
This United Airlines deal was found by Cheapflights users on 9/15. 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.
vie. 9/196:00 amONT - GUM
2 stops19h 05mUnited Airlines
dom. 9/211:00 pmGUM - ONT
2 stops21h 37mUnited Airlines
Deal found 9/15$3,205

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 septiembre 15, 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

jue. 2/26

6:00 am-7:05 pm

2 stops19h 05m

Tamuning Guam Intl

vie. 3/13

7:25 am-9:59 am

2 stops19h 34m

$1,917

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

jue. 10/2

6:00 am-3:15 pm

2 stops40h 15m

Tamuning Guam Intl

dom. 10/5

1:55 am-10:41 pm

2 stops37h 46m

$2,115

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

mar. 11/4

6:00 am-6:50 pm

2 stops18h 50m

Tamuning Guam Intl

mié. 11/12

1:00 pm-12:37 pm

2 stops17h 37m

$2,205

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

dom. 11/30

6:00 am-6:50 pm

2 stops18h 50m

Tamuning Guam Intl

dom. 1/11

1:00 pm-12:14 pm

2 stops17h 14m

$2,215

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

dom. 11/16

6:00 am-6:50 pm

2 stops18h 50m

Tamuning Guam Intl

vie. 11/21

1:00 pm-12:37 pm

2 stops17h 37m

$2,305

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

dom. 11/23

6:00 am-6:50 pm

2 stops18h 50m

Tamuning Guam Intl

vie. 11/28

1:00 pm-12:37 pm

2 stops17h 37m

$2,305

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

jue. 1/8

6:00 am-7:05 pm

2 stops19h 05m

Tamuning Guam Intl

lun. 1/12

1:00 pm-12:14 pm

2 stops17h 14m

$2,335

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

jue. 12/4

6:00 am-6:50 pm

2 stops18h 50m

Tamuning Guam Intl

dom. 1/4

7:40 am-9:07 pm

2 stops31h 27m

$2,587

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

jue. 10/2

5:05 am-9:50 pm

2 stops23h 45m

Tamuning Guam Intl

lun. 10/6

7:10 am-12:13 pm

2 stops22h 03m

$2,805

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

dom. 3/8

6:00 am-3:15 pm

3 stops40h 15m

$707

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 19 results
1
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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, January is the cheapest month in which you can book a flight from Ontario to Guam (average of $1,977). Flying from Ontario to Guam in May is currently the most expensive (average of $2,214). 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 septiembre 15, 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
8,929 reviews

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

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
8,929 reviews
United Airlines
7.4
Good
8,929 reviews

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

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 $1,917, United Airlines can have you in Guam from Ontario in 19h 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, January is the cheapest month in which you can book a flight from Ontario to Guam (average of $1,977). Flying from Ontario to Guam in May is currently the most expensive (average of $2,214). 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 septiembre 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,866Average$2,017FlexibilityNo cancel feeOn-time69%

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