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Tamuning

$1,107+ 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 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — GUM
Feb 25 — Mar 41
Wed 2/25
Wed 3/4
1 adult, Economy
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Cheap 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 January 26, 2026.

This United Airlines deal was found by Cheapflights users on 1/25. 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 10/171:33 pm
ONT
-
GUM
2 stops57h 12m
United Airlines
Wed 10/217:10 am
GUM
-
ONT
2 stops27h 08m
United Airlines
Deal found 1/25$1,107
This Delta deal was found by Cheapflights users on 1/25. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/137:00 am
ONT
-
GUM
2 stops23h 55m
Delta
Tue 10/135:00 pm
GUM
-
ONT
2 stops46h 43m
Delta
Deal found 1/25$1,754
This Delta deal was found by Cheapflights users on 1/25. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/166:00 am
ONT
-
GUM
2 stops24h 55m
Delta
Fri 10/165:00 pm
GUM
-
ONT
2 stops41h 17m
Delta
Deal found 1/25$1,804
This Delta deal was found by Cheapflights users on 1/24. 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 2/197:30 am
ONT
-
GUM
2 stops21h 35m
Delta
Mon 3/91:00 am
GUM
-
ONT
2 stops38h 33m
Delta
Deal found 1/24$1,854
This Delta deal was found by Cheapflights users on 1/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/267:30 am
ONT
-
GUM
2 stops37h 05m
Delta
Wed 3/114:50 pm
GUM
-
ONT
2 stops46h 43m
Delta
Deal found 1/26$1,859
This Delta deal was found by Cheapflights users on 1/24. 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 2/207:30 am
ONT
-
GUM
2 stops21h 35m
Delta
Wed 3/111:00 am
GUM
-
ONT
2 stops38h 33m
Delta
Deal found 1/24$1,904
This Delta deal was found by Cheapflights users on 1/24. 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 2/207:30 am
ONT
-
GUM
2 stops21h 35m
Delta
Fri 3/131:00 am
GUM
-
ONT
2 stops38h 33m
Delta
Deal found 1/24$1,954
This United Airlines deal was found by Cheapflights users on 1/25. 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.
Sun 6/216:00 am
ONT
-
GUM
2 stops19h 05m
United Airlines
Sun 7/57:05 am
GUM
-
ONT
2 stops22h 15m
United Airlines
Deal found 1/25$2,069
This United Airlines deal was found by Cheapflights users on 1/25. 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.
Mon 3/26:10 am
ONT
-
GUM
2 stops18h 55m
United Airlines
Tue 3/317:05 am
GUM
-
ONT
2 stops22h 09m
United Airlines
Deal found 1/25$2,179
This United Airlines deal was found by Cheapflights users on 1/26. 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 2/256:09 am
ONT
-
GUM
2 stops18h 56m
United Airlines
Wed 3/412:30 pm
GUM
-
ONT
2 stops18h 18m
United Airlines
Deal found 1/26$2,205
This United Airlines deal was found by Cheapflights users on 1/26. 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.
Sat 3/216:15 am
ONT
-
GUM
2 stops19h 35m
United Airlines
Fri 3/277:25 am
GUM
-
ONT
2 stops22h 23m
United Airlines
Deal found 1/26$2,279
This United Airlines deal was found by Cheapflights users on 1/24. 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 7/156:00 am
ONT
-
GUM
2 stops19h 05m
United Airlines
Mon 7/207:05 am
GUM
-
ONT
2 stops18h 58m
United Airlines
Deal found 1/24$2,309

Find 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 January 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,754
(Delta)

One-way from

$1,657
(United Airlines)

Popular in

August

Cheapest in

February

Average price

$2,236
Provider with most accurate pricing for Ontario-Tamuning Guam Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Tamuning Guam Intl flights.
Search Deals
From Ontario to Tamuning Guam Intl
Search Deals
One-way flight from Ontario to Tamuning Guam Intl
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 January 2026
Search Deals

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 January 26, 2026.
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

Mon 4/13

7:00 am-11:55 pm

2 stops23h 55m

Tamuning Guam Intl

Tue 10/13

5:00 pm-10:43 pm

2 stops46h 43m

$1,754

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Tue 4/14

7:00 am-11:55 pm

2 stops23h 55m

Tamuning Guam Intl

Tue 10/13

5:00 pm-10:43 pm

2 stops46h 43m

$1,754

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 4/16

6:00 am-11:55 pm

2 stops24h 55m

Tamuning Guam Intl

Fri 10/16

5:00 pm-5:17 pm

2 stops41h 17m

$1,804

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 2/23

6:00 am-11:05 pm

2 stops23h 05m

Tamuning Guam Intl

Sun 3/8

1:00 am-10:33 pm

2 stops38h 33m

$1,854

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 2/23

7:30 am-11:05 pm

2 stops21h 35m

Tamuning Guam Intl

Wed 3/11

1:00 am-10:33 pm

2 stops38h 33m

$1,854

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Wed 2/25

7:30 am-11:05 pm

2 stops21h 35m

Tamuning Guam Intl

Sun 3/8

1:00 am-10:33 pm

2 stops38h 33m

$1,854

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Tue 2/24

7:30 am-11:05 pm

2 stops21h 35m

Tamuning Guam Intl

Wed 3/11

1:00 am-10:33 pm

2 stops38h 33m

$1,854

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 2/19

7:30 am-11:05 pm

2 stops21h 35m

Tamuning Guam Intl

Sun 3/8

1:00 am-10:33 pm

2 stops38h 33m

$1,854

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Tue 2/24

7:30 am-11:05 pm

2 stops21h 35m

Tamuning Guam Intl

Mon 3/9

1:00 am-10:33 pm

2 stops38h 33m

$1,854

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Wed 2/25

7:30 am-11:05 pm

2 stops21h 35m

Tamuning Guam Intl

Mon 3/9

1:00 am-10:33 pm

2 stops38h 33m

$1,854

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Showing 1-10 of 16 results
1
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 January.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Tamuning flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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, February is the cheapest month in which you can book a flight from Ontario to Tamuning (average of $483). Flying from Ontario to Tamuning in June is currently the most expensive (average of $1,986). 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 January 26, 2026.
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
9,199 reviews

Boarding

7.7

Food

6.6

Entertainment

7.1

Comfort

7.3

Overall

7.4

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
9,199 reviews
United Airlines
7.4
Good
9,199 reviews

Boarding

7.7

Food

6.6

Entertainment

7.1

Comfort

7.3

Overall

7.4

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 $1,754, Delta can have you in Tamuning from Ontario in 23h 55m. 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, February is the cheapest month in which you can book a flight from Ontario to Tamuning (average of $483). Flying from Ontario to Tamuning in June is currently the most expensive (average of $1,986). 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

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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 January 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$1,867Average$2,017FlexibilityNo cancel feeOn-time69%

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