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Cheap flights from Ontario to Guam from $1,427

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Guam departing on 7/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Ontario to Guam

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
6:00 am - 7:00 pm
ONT
-
GUM
19h 00m
2 stops
United Airlines Logo
7:45 am - 12:42 pm
GUM
-
ONT
22h 57m
2 stops
$1,869United Airlines
Mon, Nov 16 - Mon, Nov 23
United Airlines Logo
6:00 am - 7:00 pm
ONT
-
GUM
19h 00m
2 stops
United Airlines Logo
7:45 am - 5:47 pm
GUM
-
ONT
28h 02m
2 stops
$1,919United Airlines
Thu, Nov 19 - Sat, Dec 5
Delta Logo
6:20 am - 11:55 pm
ONT
-
GUM
24h 35m
2 stops
Delta Logo
2:00 am - 10:45 pm
GUM
-
ONT
37h 45m
2 stops
$1,953Delta
Thu, Aug 20 - Sun, Aug 30
United Airlines Logo
6:08 am - 6:05 pm
ONT
-
GUM
18h 57m
2 stops
United Airlines Logo
7:10 am - 12:50 pm
GUM
-
ONT
22h 40m
2 stops
$1,969United Airlines
Wed, Sep 2 - Thu, Sep 10
United Airlines Logo
6:08 am - 6:05 pm
ONT
-
GUM
18h 57m
2 stops
United Airlines Logo
1:00 pm - 2:01 pm
GUM
-
ONT
18h 01m
2 stops
$1,995United Airlines
Mon, Sep 7 - Tue, Sep 15
Delta Logo
6:00 am - 11:55 pm
ONT
-
GUM
24h 55m
2 stops
Delta Logo
5:20 pm - 10:45 pm
GUM
-
ONT
46h 25m
2 stops
$2,012Delta
Mon, Jul 27 - Mon, Aug 10
Delta Logo
6:00 am - 11:55 pm
ONT
-
GUM
24h 55m
2 stops
Delta Logo
5:20 pm - 11:48 pm
GUM
-
ONT
47h 28m
2 stops
$2,028Delta
Wed, Jul 22 - Wed, Jul 29
United Airlines Logo
8:00 am - 4:20 am
ONT
-
GUM
27h 20m
2 stops
United Airlines Logo
7:15 am - 6:11 pm
GUM
-
ONT
27h 56m
2 stops
$2,107United Airlines
Sat, Sep 5 - Sat, Sep 12
United Airlines Logo
6:00 am - 7:00 pm
ONT
-
GUM
19h 00m
2 stops
United Airlines Logo
7:45 am - 12:42 pm
GUM
-
ONT
22h 57m
2 stops
$2,179United Airlines
Mon, Nov 23 - Thu, Nov 26
United Airlines Logo
6:00 am - 7:00 pm
ONT
-
GUM
19h 00m
2 stops
United Airlines Logo
4:55 pm - 3:27 pm
GUM
-
ONT
40h 32m
2 stops
$2,273United Airlines
Fri, Dec 18 - Thu, Dec 24

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United Airlines flights from Ontario to Guam

Our best United Airlines deals on Ontario to Guam flight tickets
United Airlines
Nov 16
ONT6:00 amOntario
19h 00m
2 stops
GUM7:00 pmTamuning Guam Intl
Nov 23
GUM7:45 amTamuning Guam Intl
22h 57m
2 stops
ONT12:42 pmOntario
$1,869
United Airlines
Nov 19
ONT6:00 amOntario
19h 00m
2 stops
GUM7:00 pmTamuning Guam Intl
Dec 5
GUM7:45 amTamuning Guam Intl
28h 02m
2 stops
ONT5:47 pmOntario
$1,919
United Airlines
Sep 2
ONT6:08 amOntario
18h 57m
2 stops
GUM6:05 pmTamuning Guam Intl
Sep 10
GUM7:10 amTamuning Guam Intl
22h 40m
2 stops
ONT12:50 pmOntario
$1,969

Delta flights from Ontario to Guam

Our best Delta deals on Ontario to Guam flight tickets
Delta
Aug 20
ONT6:20 amOntario
24h 35m
2 stops
GUM11:55 pmTamuning Guam Intl
Aug 30
GUM2:00 amTamuning Guam Intl
37h 45m
2 stops
ONT10:45 pmOntario
$1,953
Delta
Jul 27
ONT6:00 amOntario
24h 55m
2 stops
GUM11:55 pmTamuning Guam Intl
Aug 10
GUM5:20 pmTamuning Guam Intl
46h 25m
2 stops
ONT10:45 pmOntario
$2,012
Delta
Jul 22
ONT6:00 amOntario
24h 55m
2 stops
GUM11:55 pmTamuning Guam Intl
Jul 29
GUM5:20 pmTamuning Guam Intl
47h 28m
2 stops
ONT11:48 pmOntario
$2,028

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Guam 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, momondo users made 832,500 searches. Data last updated June 27, 2026.
Use the filters below to find and compare flights from Ontario to Guam that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 11/16

6:00 am-7:00 pm

2 stops19h 00m

Tamuning Guam Intl

Mon 11/23

7:45 am-12:42 pm

2 stops22h 57m

$1,869

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 11/19

6:00 am-7:00 pm

2 stops19h 00m

Tamuning Guam Intl

Sat 12/5

7:45 am-5:47 pm

2 stops28h 02m

$1,919

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 8/20

6:20 am-11:55 pm

2 stops24h 35m

Tamuning Guam Intl

Sun 8/30

2:00 am-10:45 pm

2 stops37h 45m

$1,953

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Wed 9/2

6:08 am-6:05 pm

2 stops18h 57m

Tamuning Guam Intl

Thu 9/10

7:10 am-12:50 pm

2 stops22h 40m

$1,969
Quickest round-trip

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 9/7

6:08 am-6:05 pm

2 stops18h 57m

Tamuning Guam Intl

Tue 9/15

1:00 pm-2:01 pm

2 stops18h 01m

$1,995

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 7/27

6:00 am-11:55 pm

2 stops24h 55m

Tamuning Guam Intl

Mon 8/10

5:20 pm-10:45 pm

2 stops46h 25m

$2,012

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Wed 7/22

6:00 am-11:55 pm

2 stops24h 55m

Tamuning Guam Intl

Wed 7/29

5:20 pm-11:48 pm

2 stops47h 28m

$2,028

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Sat 9/5

8:00 am-4:20 am

2 stops27h 20m

Tamuning Guam Intl

Sat 9/12

7:15 am-6:11 pm

2 stops27h 56m

$2,107

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 11/23

6:00 am-7:00 pm

2 stops19h 00m

Tamuning Guam Intl

Thu 11/26

7:45 am-12:42 pm

2 stops22h 57m

$2,179

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Fri 12/18

6:00 am-7:00 pm

2 stops19h 00m

Tamuning Guam Intl

Thu 12/24

4:55 pm-3:27 pm

2 stops40h 32m

$2,273

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Guam from

How to get the cheapest flight ticket from Ontario to Guam

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Ontario to Guam?

Delta is the most popular carrier operating from Ontario to Guam

Cheap Ontario to Guam flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Guam

Fastest flight time

18h 57m

Direct flights

None
The fastest flight from Ontario to Guam takes 18h 57m
There are no direct flights from Ontario to Guam. There are no popular flight routes from Ontario to Guam.
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Frequently asked questions about flying from Ontario to Guam

  • When did momondo last update prices for flights from Ontario Airport to Guam?

    Prices for flights from Ontario Airport to Guam were last updated today.

  • How old do you have to be to fly from Ontario Airport to Guam?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Guam.

  • What documentation or ID do you need to fly to Guam?

    The necessary travel and health documents for your Guam trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Guam?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Ontario to Guam for you.

Can I find flights from Ontario to Guam with flexible booking policies on momondo?

Yes. All flights to Guam from Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Ontario to Guam?

momondo helps you find the best flight between Ontario and Guam by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Ontario to Guam right now. Can momondo alert me if prices change?

Price alerts on flights to Guam from Ontario are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Mon 7/27
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Popular flights according to clicks in the last 7 days on momondo
Flights to Tamuningfrom $806