How far in advance should I book a flight from Guam to Ontario?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 28 days in advance, which can save you up to 22% on flights from Guam to Ontario compared to booking the week you need them. Waiting 28 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $1,541. For sooner than that we have options available in the next 3 days from $1,901.

What is the cheapest month to fly from Guam to Ontario?

Flights from Guam to Ontario lean towards being more expensive in December. Prices are generally better when you fly from Guam to Ontario in October, with the cheapest ticket starting at $1,357.

What is the cheapest time of day to fly from GU to ONT?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Guam to Ontario as you normally would.

What airport do you fly into for flights to Ontario from Guam?

For a flight from Guam to Ontario, you will be flying into Ontario. Ontario (ONT) is just 3.1 mi from the center of the city.

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

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

How can I find direct flights from Guam to Ontario?

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

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

Yes. Cheapflights offers flight deals from Guam 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.

$1,943+ Flights from Guam to Ontario

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Cheap flight deals from Guam to Ontario

Round-trip from	$1,382 (United Airlines)

From Guam to Ontario

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Find flight deals from Guam to Ontario

Best flights from Guam to Ontario
Discover carefully curated flight deals from Guam to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 18, 2024.

Tue 3/1812:45 pmGUM - ONT

2 stops22h 19mUnited Airlines

Thu 3/276:00 amONT - GUM

2 stops19h 50mUnited Airlines

Deal found 12/17

$1,382

Last-minute flights from Guam to Ontario
Discover last-minute flight deals from Guam to Ontario. Data last updated December 18, 2024 and is based on user searches.

Wed 1/17:25 amGUM - ONT

2 stops28h 01mUnited Airlines

Wed 1/810:47 amONT - GUM

2 stops47h 38mUnited Airlines

Deal found 12/17

$1,629

One-way flights from Guam to Ontario
Search for one-way flight options from Guam to Ontario. Find affordable one-way fares based on user searches. Data last updated December 18, 2024.

Fri 1/37:25 amGUM - ONT

2 stops47h 51mUnited Airlines

Deal found 12/17

$2,662

Find flights from Guam to Ontario within your budget

Fly from

Fly to

Route

Depart

Return

Price

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Tue 3/18

12:45 pm-6:04 pm

2 stops22h 19m

Ontario

Thu 3/27

6:00 am-6:50 pm

2 stops19h 50m

$1,382

TamuningOntario

GUM - ONT

GUMONT

Tamuning Guam Intl

Fri 1/3

7:25 am-1:16 pm

2 stops47h 51m

$2,662

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Best time to book a flight from Guam to Ontario

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

Travel insights for flights from Guam to Ontario

Get recent, data-driven insights about flights from Guam to Ontario including ideal travel times, pricing trends, and more.

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

Currently, September is the cheapest month in which you can book a flight from Guam to Ontario (average of $236). Flying from Guam to Ontario in December is currently the most expensive (average of $298). 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.

Rainfall in Ontario by month

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

Reviews of airlines servicing Ontario

United Airlines

7.4

Good

9,059 reviews

Reviews

1 / 10

Basic and no-frills. Late timing put pressure on disembarking and making connections.

United Airlines

7.4

Good

9,059 reviews

United Airlines

7.4

Good

9,059 reviews

Reviews

1 / 10

Basic and no-frills. Late timing put pressure on disembarking and making connections.

Related info for your journey

What airport do you fly into for flights to Ontario from Guam?
For a flight from Guam to Ontario, you will be flying into Ontario. Ontario (ONT) is just 3.1 mi from the center of the city.
Can I find deals for flights from Guam to Ontario that include hotel bookings?
Yes. In addition to deals on Guam to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Guam to Ontario?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Guam to Ontario.
Can I find deals for business class flights from Guam to Ontario?
Yes. Cheapflights offers flight deals from Guam 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 Guam to Ontario?
Currently, September is the cheapest month in which you can book a flight from Guam to Ontario (average of $236). Flying from Guam to Ontario in December is currently the most expensive (average of $298). 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 Guam to Ontario

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$1,375	Average$1,625	FlexibilityNo cancel fee	On-time69%

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$1,382+ Cheap flights from Guam 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 3/18. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Guam to Ontario with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Guam to Ontario

Round-trip from

Find flight deals from Guam to Ontario

Best flights from Guam to OntarioDiscover carefully curated flight deals from Guam to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 18, 2024.

Discover carefully curated flight deals from Guam to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 18, 2024.

Find flights from Guam to Ontario within your budget

Best time to book a flight from Guam to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Guam with our price prediction graph.

Travel insights for flights from Guam to Ontario

Get recent, data-driven insights about flights from Guam to Ontario including ideal travel times, pricing trends, and more.

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

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

Reviews of airlines servicing Ontario

Related info for your journey

Find useful and relevant information for your journey from Guam to Ontario. 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 into for flights to Ontario from Guam?

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

How can I find direct flights from Guam to Ontario?

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

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

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.

Alternative routes for Guam to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Guam to Ontario

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Book with Flexibility

Travel Smart

Best flights from Guam to Ontario
Discover carefully curated flight deals from Guam to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 18, 2024.