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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 4/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Ontario to Guam

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
6:45 am - 11:55 pm
ONT
-
GUM
24h 10m
2 stops
Delta Logo
3:00 am - 10:34 pm
GUM
-
ONT
36h 34m
2 stops
$1,853Delta
Thu, May 7 - Wed, May 13
Delta Logo
6:45 am - 11:55 pm
ONT
-
GUM
24h 10m
2 stops
Delta Logo
3:00 am - 10:34 pm
GUM
-
ONT
36h 34m
2 stops
$1,903Delta
Thu, May 7 - Sat, May 16
United Airlines Logo
6:00 am - 6:05 pm
ONT
-
GUM
19h 05m
2 stops
United Airlines Logo
7:30 pm - 5:56 pm
GUM
-
ONT
39h 26m
2 stops
$1,942United Airlines
Thu, May 28 - Wed, Jun 3
United Airlines Logo
8:00 am - 9:50 pm
ONT
-
GUM
20h 50m
2 stops
United Airlines Logo
7:10 am - 12:20 pm
GUM
-
ONT
22h 10m
2 stops
$1,945United Airlines
Tue, Sep 8 - Wed, Sep 30
Delta Logo
7:00 am - 3:35 pm
ONT
-
GUM
39h 35m
2 stops
Delta Logo
5:20 pm - 10:40 pm
GUM
-
ONT
46h 20m
2 stops
$1,953Delta
Sun, Sep 6 - Sat, Sep 12
United Airlines Logo
6:00 am - 6:05 pm
ONT
-
GUM
19h 05m
2 stops
United Airlines Logo
7:05 am - 12:12 pm
GUM
-
ONT
22h 07m
2 stops
$1,969United Airlines
Wed, Jun 3 - Wed, Jun 24
United Airlines Logo
6:00 am - 6:05 pm
ONT
-
GUM
19h 05m
2 stops
United Airlines Logo
7:05 am - 12:12 pm
GUM
-
ONT
22h 07m
2 stops
$2,019United Airlines
Fri, Jun 5 - Thu, Jun 25
United Airlines Logo
1:50 pm - 6:05 pm
ONT
-
GUM
35h 15m
2 stops
United Airlines Logo
7:30 pm - 5:56 pm
GUM
-
ONT
39h 26m
2 stops
$2,065United Airlines
Sat, Jun 6 - Sun, Jun 14
United Airlines Logo
6:30 pm - 6:05 pm
ONT
-
GUM
54h 35m
2 stops
United Airlines Logo
7:30 pm - 5:56 pm
GUM
-
ONT
39h 26m
2 stops
$2,092United Airlines
Fri, Jun 12 - Sun, Jun 21
United Airlines Logo
6:00 am - 6:05 pm
ONT
-
GUM
19h 05m
2 stops
United Airlines Logo
7:05 am - 12:12 pm
GUM
-
ONT
22h 07m
2 stops
$2,139United Airlines
Wed, Jun 17 - Thu, Jun 25

United Airlines flights from Ontario to Guam

Our best United Airlines deals on Ontario to Guam flight tickets
United Airlines
May 28
ONT6:00 amOntario
19h 05m
2 stops
GUM6:05 pmTamuning Guam Intl
Jun 3
GUM7:30 pmTamuning Guam Intl
39h 26m
2 stops
ONT5:56 pmOntario
$1,942
United Airlines
Sep 8
ONT8:00 amOntario
20h 50m
2 stops
GUM9:50 pmTamuning Guam Intl
Sep 30
GUM7:10 amTamuning Guam Intl
22h 10m
2 stops
ONT12:20 pmOntario
$1,945
United Airlines
Jul 14
ONT6:00 amOntario
19h 05m
2 stops
GUM6:05 pmTamuning Guam Intl
Jul 21
GUM7:05 amTamuning Guam Intl
22h 07m
2 stops
ONT12:12 pmOntario
$1,969

Delta flights from Ontario to Guam

Our best Delta deals on Ontario to Guam flight tickets
Delta
May 5
ONT6:00 amOntario
40h 35m
2 stops
GUM3:35 pmTamuning Guam Intl
May 11
GUM3:00 amTamuning Guam Intl
31h 10m
2 stops
ONT5:10 pmOntario
$1,853
Delta
May 2
ONT7:00 amOntario
23h 55m
2 stops
GUM11:55 pmTamuning Guam Intl
May 20
GUM3:00 amTamuning Guam Intl
31h 10m
2 stops
ONT5:10 pmOntario
$1,903
Delta
Sep 6
ONT7:00 amOntario
39h 35m
2 stops
GUM3:35 pmTamuning Guam Intl
Sep 12
GUM5:20 pmTamuning Guam Intl
46h 20m
2 stops
ONT10:40 pmOntario
$1,953

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 March 24, 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

Thu 5/7

6:45 am-11:55 pm

2 stops24h 10m

Tamuning Guam Intl

Wed 5/13

3:00 am-10:34 pm

2 stops36h 34m

$1,853

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 5/7

6:45 am-11:55 pm

2 stops24h 10m

Tamuning Guam Intl

Sat 5/16

3:00 am-10:34 pm

2 stops36h 34m

$1,903

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 5/28

6:00 am-6:05 pm

2 stops19h 05m

Tamuning Guam Intl

Wed 6/3

7:30 pm-5:56 pm

2 stops39h 26m

$1,942

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Tue 9/8

8:00 am-9:50 pm

2 stops20h 50m

Tamuning Guam Intl

Wed 9/30

7:10 am-12:20 pm

2 stops22h 10m

$1,945

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Sun 9/6

7:00 am-3:35 pm

2 stops39h 35m

Tamuning Guam Intl

Sat 9/12

5:20 pm-10:40 pm

2 stops46h 20m

$1,953
Quickest round-trip

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Wed 6/3

6:00 am-6:05 pm

2 stops19h 05m

Tamuning Guam Intl

Wed 6/24

7:05 am-12:12 pm

2 stops22h 07m

$1,969

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Fri 6/5

6:00 am-6:05 pm

2 stops19h 05m

Tamuning Guam Intl

Thu 6/25

7:05 am-12:12 pm

2 stops22h 07m

$2,019

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Sat 6/6

1:50 pm-6:05 pm

2 stops35h 15m

Tamuning Guam Intl

Sun 6/14

7:30 pm-5:56 pm

2 stops39h 26m

$2,065

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Fri 6/12

6:30 pm-6:05 pm

2 stops54h 35m

Tamuning Guam Intl

Sun 6/21

7:30 pm-5:56 pm

2 stops39h 26m

$2,092

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Wed 6/17

6:00 am-6:05 pm

2 stops19h 05m

Tamuning Guam Intl

Thu 6/25

7:05 am-12:12 pm

2 stops22h 07m

$2,139

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 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 and United Airlines are the most popular carriers 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

19h 05m

Direct flights

None
The fastest flight from Ontario to Guam takes 19h 05m
There are no direct flights from Ontario to Guam. There are no popular flight routes from Ontario to Guam.
Search flight deals

  • 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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Flights to Tamuningfrom $936