HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$1,378+ Cheap flights from Tamuning (GUM) to Ontario (ONT)

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 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
GUM — ONT
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Tamuning to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Tamuning to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Tamuning (GUM) to Ontario (ONT). 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 July 29, 2025.

Round-trip from

$1,378
(United Airlines)

Popular in

July

Cheapest in

October

Average price

$1,714
From Tamuning Guam Intl to Ontario
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($148 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

Find flight deals from Tamuning to Ontario

Cheapest flights from Tamuning to Ontario
Explore the most affordable flight options available from Tamuning to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

This United Airlines deal was found by Cheapflights users on 7/28. 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.
Tue 9/237:20 amGUM - ONT
2 stops27h 17mUnited Airlines
Tue 10/281:40 pmONT - GUM
2 stops36h 10mUnited Airlines
Deal found 7/28$1,378
This Delta deal was found by Cheapflights users on 7/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/171:55 amGUM - ONT
2 stops51h 22mDelta
Sun 9/219:50 amONT - GUM
2 stops45h 20mDelta
Deal found 7/28$1,735

Cheapflights Fare Finder

 
Customize your flight search to find flights from Tamuning to Ontario 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 July 29, 2025.
Use the filters below to find and compare flights from Tamuning to Ontario that are best for you.

Fly from

Tamuning

Fly to

Ontario

Route

Depart

Return

Price

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Tue 9/23

7:20 am-5:37 pm

2 stops27h 17m

Ontario

Tue 10/28

1:40 pm-6:50 pm

2 stops36h 10m

$1,378

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Wed 9/17

1:55 am-12:17 pm

2 stops51h 22m

Ontario

Sun 9/21

9:50 am-12:10 am

2 stops45h 20m

$1,735

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Best time to book a flight from Tamuning to Ontario

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

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

Currently, August is the cheapest month in which you can book a flight from Tamuning to Ontario (average of $246). Flying from Tamuning to Ontario in March is currently the most expensive (average of $328). 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 Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated July 29, 2025.
Read through reviews of airlines operating flights from Tamuning to Ontario, such as Delta and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,977 reviews

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,977 reviews
Delta
8.0
Very good
7,977 reviews

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,899 reviews
Delta
8.0
Very good
7,977 reviews

Comfort

7.9

Crew

8.5

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Tamuning to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Tamuning to Ontario (average of $246). Flying from Tamuning to Ontario in March is currently the most expensive (average of $328). 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.