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Tamuning

$1,017+ Cheap flights from Ontario (ONT) to Tamuning (GUM)

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 11/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GUM
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from Ontario to Tamuning

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Tamuning (GUM). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 11, 2025.

Round-trip from

$1,017
(United Airlines)

Popular in

December

Cheapest in

October

Average price

$1,877
From Ontario to Tamuning Guam Intl
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Highest demand for flights based on searches. 6% potential increase in price ($153 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($94 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 Tamuning

Cheapest flights from Ontario to Tamuning
Explore the most affordable flight options available from Ontario to Tamuning. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/10. 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 11/271:40 pmONT - GUM
2 stops56h 00mUnited Airlines
Mon 12/17:25 amGUM - ONT
2 stops23h 08mUnited Airlines
Deal found 9/10$1,017
This Delta deal was found by Cheapflights users on 9/11. 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.
Mon 10/136:00 amONT - GUM
2 stops25h 10mDelta
Sun 10/261:00 amGUM - ONT
2 stops38h 41mDelta
Deal found 9/11$1,835
This Delta deal was found by Cheapflights users on 9/10. 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 10/86:00 amONT - GUM
2 stops40h 15mDelta
Wed 10/155:00 pmGUM - ONT
2 stops46h 41mDelta
Deal found 9/10$1,853
This United Airlines deal was found by Cheapflights users on 9/11. 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 10/96:27 pmONT - GUM
2 stops54h 38mUnited Airlines
Mon 10/137:20 amGUM - ONT
2 stops27h 20mUnited Airlines
Deal found 9/11$1,915
This United Airlines deal was found by Cheapflights users on 9/9. 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 stops19h 00mUnited Airlines
Tue 1/67:25 amGUM - ONT
2 stops31h 33mUnited Airlines
Deal found 9/9$1,967
This United Airlines deal was found by Cheapflights users on 9/9. 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 12/215:05 amONT - GUM
2 stops43h 55mUnited Airlines
Tue 1/67:25 amGUM - ONT
2 stops31h 33mUnited Airlines
Deal found 9/9$1,989
This United Airlines deal was found by Cheapflights users on 9/9. 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 12/201:40 pmONT - GUM
2 stops59h 20mUnited Airlines
Tue 1/67:25 amGUM - ONT
2 stops31h 33mUnited Airlines
Deal found 9/9$2,005
This Delta deal was found by Cheapflights users on 9/10. 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.
Mon 10/136:00 amONT - GUM
2 stops25h 10mDelta
Wed 10/151:55 amGUM - ONT
2 stops37h 46mDelta
Deal found 9/10$2,053
This United Airlines deal was found by Cheapflights users on 9/9. 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 12/191:40 pmONT - GUM
2 stops59h 20mUnited Airlines
Tue 1/67:25 amGUM - ONT
2 stops31h 33mUnited Airlines
Deal found 9/9$2,056
This Delta deal was found by Cheapflights users on 9/10. 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 10/126:00 amONT - GUM
2 stops25h 10mDelta
Tue 10/141:55 amGUM - ONT
2 stops37h 46mDelta
Deal found 9/10$2,103
This Delta deal was found by Cheapflights users on 9/9. 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.
Thu 10/26:00 amONT - GUM
2 stops40h 15mDelta
Sun 10/51:55 amGUM - ONT
2 stops38h 44mDelta
Deal found 9/9$2,115
This Delta deal was found by Cheapflights users on 9/10. 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 10/126:00 amONT - GUM
2 stops25h 10mDelta
Thu 10/161:55 amGUM - ONT
2 stops37h 46mDelta
Deal found 9/10$2,153

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Tamuning 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 11, 2025.
Use the filters below to find and compare flights from Ontario to Tamuning that are best for you.

Fly from

Ontario

Fly to

Tamuning

Route

Depart

Return

Price

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 11/27

1:40 pm-3:40 pm

2 stops56h 00m

Tamuning Guam Intl

Mon 12/1

7:25 am-12:33 pm

2 stops23h 08m

$1,017

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 10/13

6:00 am-12:10 am

2 stops25h 10m

Tamuning Guam Intl

Sun 10/26

1:00 am-10:41 pm

2 stops38h 41m

$1,835

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Wed 10/8

6:00 am-12:10 am

2 stops25h 10m

Tamuning Guam Intl

Tue 10/14

1:55 am-10:41 pm

2 stops37h 46m

$1,853

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 10/9

6:27 pm-6:05 pm

2 stops54h 38m

Tamuning Guam Intl

Mon 10/13

7:20 am-5:40 pm

2 stops27h 20m

$1,915

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 12/18

6:00 am-7:00 pm

2 stops19h 00m

Tamuning Guam Intl

Tue 1/6

7:25 am-8:58 pm

2 stops31h 33m

$1,967

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Sun 12/21

5:05 am-7:00 pm

2 stops43h 55m

Tamuning Guam Intl

Tue 1/6

7:25 am-8:58 pm

2 stops31h 33m

$1,989

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Fri 12/19

1:40 pm-7:00 pm

2 stops59h 20m

Tamuning Guam Intl

Tue 1/6

7:25 am-8:58 pm

2 stops31h 33m

$2,056

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Sun 10/12

6:00 am-12:10 am

2 stops25h 10m

Tamuning Guam Intl

Tue 10/14

1:55 am-10:41 pm

2 stops37h 46m

$2,103

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Tue 10/14

7:35 am-12:10 am

2 stops23h 35m

Tamuning Guam Intl

Thu 10/16

1:55 am-10:41 pm

2 stops37h 46m

$2,103

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 10/2

6:00 am-3:15 pm

2 stops40h 15m

Tamuning Guam Intl

Sun 10/5

1:55 am-11:39 pm

2 stops38h 44m

$2,115

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 13 results
1
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Best time to book a flight from Ontario to Tamuning

Have a flexible travel schedule? Discover the best time to fly to Tamuning 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 Tamuning

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

Currently, January is the cheapest month in which you can book a flight from Ontario to Tamuning (average of $1,977). Flying from Ontario to Tamuning 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 Tamuning

Get insights into the airlines that provide service to Tamuning. 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 Tamuning. Reviews last updated September 11, 2025.
Get a feel of what it's like to fly with United Airlines from Ontario to Tamuning by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,937 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Comfort

7.3

Boarding

7.7

Crew

8.1

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
8,937 reviews
United Airlines
7.4
Good
8,937 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Comfort

7.3

Boarding

7.7

Crew

8.1

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 Tamuning. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Ontario to Tamuning?

    For as low as $1,835, United Airlines can have you in Tamuning from Ontario in 25h 10m. Ontario and Tamuning are separated by a distance of 6119 mi. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Ontario to Tamuning round-trip?

    United Airlines, at $1,866, was found to be the cheapest airline from Ontario to Tamuning.. United Airlines is priced at 11% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Ontario to Tamuning (average of $1,977). Flying from Ontario to Tamuning 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top airline flying from Ontario to Tamuning

Discover the top airline that operate flights from Ontario to Tamuning. 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,866Average$2,017FlexibilityNo cancel feeOn-time69%

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