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Tamuning

$1,656+ Cheap flights from Ontario (ONT) to Tamuning (GUM)

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 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GUM
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
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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 October 28, 2025.

This United Airlines deal was found by Cheapflights users on 10/27. 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 12/16:00 amONT - GUM
2 stops18h 50mUnited Airlines
Mon 12/87:40 amGUM - ONT
2 stops22h 52mUnited Airlines
Deal found 10/27$2,178
This United Airlines deal was found by Cheapflights users on 10/28. 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.
Wed 12/176:00 amONT - GUM
2 stops18h 50mUnited Airlines
Mon 12/297:40 amGUM - ONT
2 stops20h 21mUnited Airlines
Deal found 10/28$2,308
This United Airlines deal was found by Cheapflights users on 10/26. 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.
Wed 11/126:00 amONT - GUM
2 stops18h 50mUnited Airlines
Wed 11/197:40 amGUM - ONT
2 stops22h 51mUnited Airlines
Deal found 10/26$2,378
This United Airlines deal was found by Cheapflights users on 10/26. 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 11/116:00 amONT - GUM
2 stops18h 50mUnited Airlines
Tue 11/1812:30 pmGUM - ONT
2 stops18h 07mUnited Airlines
Deal found 10/26$2,405
This United Airlines deal was found by Cheapflights users on 10/25. 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 11/156:38 pmONT - GUM
2 stops54h 12mUnited Airlines
Sun 11/307:40 amGUM - ONT
2 stops22h 53mUnited Airlines
Deal found 10/25$2,454
This United Airlines deal was found by Cheapflights users on 10/26. 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 10/276:00 amONT - GUM
2 stops19h 50mUnited Airlines
Mon 11/37:40 amGUM - ONT
2 stops22h 57mUnited Airlines
Deal found 10/26$2,778
This United Airlines deal was found by Cheapflights users on 10/25. 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.
Wed 10/296:00 amONT - GUM
2 stops19h 50mUnited Airlines
Fri 10/317:20 pmGUM - ONT
2 stops39h 14mUnited Airlines
Deal found 10/25$2,852
This United Airlines deal was found by Cheapflights users on 10/27. 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 12/296:00 amONT - GUM
2 stops19h 00mUnited Airlines
Wed 12/317:40 amGUM - ONT
2 stops22h 58mUnited Airlines
Deal found 10/27$3,078
This United Airlines deal was found by Cheapflights users on 10/27. 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 10/316:00 amONT - GUM
2 stops19h 50mUnited Airlines
Sun 11/27:40 amGUM - ONT
2 stops22h 57mUnited Airlines
Deal found 10/27$3,178
This United Airlines deal was found by Cheapflights users on 10/28. 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 11/16:00 amONT - GUM
2 stops19h 50mUnited Airlines
Sun 11/237:40 amGUM - ONT
2 stops27h 54mUnited Airlines
Deal found 10/28$3,900

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 October 28, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,840
(Delta)

One-way from

$1,656
(United Airlines)

Popular in

August

Cheapest in

September

Average price

$2,451
Provider with most accurate pricing for Ontario-Tamuning Guam Intl flight deals.
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Provider most trusted by Cheapflights users for Ontario-Tamuning Guam Intl flights.
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From Ontario to Tamuning Guam Intl
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One-way flight from Ontario to Tamuning Guam Intl
Search Deals
High demand for flights, 3% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($57 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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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 October 28, 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

Wed 1/7

7:30 am-11:05 pm

2 stops21h 35m

Tamuning Guam Intl

Fri 1/16

4:50 pm-10:29 pm

2 stops47h 39m

$1,840

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Sun 1/4

11:42 am-11:05 pm

2 stops41h 23m

Tamuning Guam Intl

Mon 1/12

1:00 am-10:29 pm

2 stops39h 29m

$1,840

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 1/5

6:00 am-2:35 pm

2 stops38h 35m

Tamuning Guam Intl

Sun 1/11

1:00 am-10:29 pm

2 stops39h 29m

$1,840

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 1/5

7:30 am-11:05 pm

2 stops21h 35m

Tamuning Guam Intl

Thu 1/15

1:00 am-10:29 pm

2 stops39h 29m

$1,840

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Tue 1/6

7:30 am-11:05 pm

2 stops21h 35m

Tamuning Guam Intl

Fri 1/16

4:50 pm-10:29 pm

2 stops47h 39m

$1,840

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Sun 1/4

1:15 pm-11:05 pm

2 stops39h 50m

Tamuning Guam Intl

Wed 1/14

1:00 am-10:29 pm

2 stops39h 29m

$1,840

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 1/8

7:30 am-11:05 pm

2 stops21h 35m

Tamuning Guam Intl

Fri 1/16

4:50 pm-10:29 pm

2 stops47h 39m

$1,840

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Tue 1/6

7:30 am-2:35 pm

2 stops37h 05m

Tamuning Guam Intl

Wed 1/14

1:00 am-10:29 pm

2 stops39h 29m

$1,840

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 1/5

7:30 am-2:35 pm

2 stops37h 05m

Tamuning Guam Intl

Wed 1/14

1:00 am-10:29 pm

2 stops39h 29m

$1,840

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 1/8

6:00 am-11:05 pm

2 stops23h 05m

Tamuning Guam Intl

Wed 1/14

1:00 am-10:29 pm

2 stops39h 29m

$1,840

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

Showing 1-10 of 15 results
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2

Compare providers for flights from Ontario to Tamuning

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Tamuning in October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Tamuning flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-Tamuning flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Ontario-Tamuning flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Tamuning flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Tamuning flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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, September is the cheapest month in which you can book a flight from Ontario to Tamuning (average of $467). Flying from Ontario to Tamuning in June is currently the most expensive (average of $1,955). 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 October 28, 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
9,001 reviews

Crew

8.1

Boarding

7.7

Overall

7.4

Comfort

7.3

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
9,001 reviews
United Airlines
7.4
Good
9,001 reviews

Crew

8.1

Boarding

7.7

Overall

7.4

Comfort

7.3

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 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 $1,840, Delta can have you in Tamuning from Ontario in 21h 35m. Ontario and Tamuning are separated by a distance of 6119 mi.

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

    United Airlines, at $1,867, was found to be the cheapest airline from Ontario to Tamuning..

  • 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, September is the cheapest month in which you can book a flight from Ontario to Tamuning (average of $467). Flying from Ontario to Tamuning in June is currently the most expensive (average of $1,955). 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 October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,867Average$2,017FlexibilityNo cancel feeOn-time69%

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