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Cheap flights from Ontario to Guam from $1,428

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 9/21. 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
7:00 am - 11:55 pm
ONT
-
GUM
23h 55m
2 stops
Delta Logo
4:50 pm - 5:17 pm
GUM
-
ONT
42h 27m
2 stops
$1,802Delta
Fri, Oct 23 - Sun, Nov 15
Delta Logo
6:00 am - 11:55 pm
ONT
-
GUM
24h 55m
2 stops
Delta Logo
4:50 pm - 5:17 pm
GUM
-
ONT
42h 27m
2 stops
$1,854Delta
Fri, Oct 23 - Sat, Nov 14
United Airlines Logo
6:05 am - 6:05 pm
ONT
-
GUM
19h 00m
2 stops
United Airlines Logo
7:25 am - 12:33 pm
GUM
-
ONT
22h 08m
2 stops
$1,919United Airlines
Thu, Oct 22 - Fri, Oct 30
United Airlines Logo
6:00 am - 6:05 pm
ONT
-
GUM
19h 05m
2 stops
United Airlines Logo
7:10 am - 12:12 pm
GUM
-
ONT
22h 02m
2 stops
$1,969United Airlines
Tue, Aug 25 - Tue, Sep 8
United Airlines Logo
6:00 am - 3:50 pm
ONT
-
GUM
40h 50m
2 stops
United Airlines Logo
7:30 pm - 10:50 pm
GUM
-
ONT
44h 20m
2 stops
$2,106United Airlines
Fri, Jul 10 - Fri, Jul 17
United Airlines Logo
6:05 am - 6:05 pm
ONT
-
GUM
19h 00m
2 stops
United Airlines Logo
7:10 am - 12:12 pm
GUM
-
ONT
22h 02m
2 stops
$2,179United Airlines
Thu, Oct 8 - Tue, Oct 13
United Airlines Logo
9:01 am - 9:45 pm
ONT
-
GUM
19h 44m
2 stops
United Airlines Logo
7:10 am - 12:12 pm
GUM
-
ONT
22h 02m
2 stops
$2,215United Airlines
Sat, Sep 5 - Sat, Oct 3
United Airlines Logo
6:00 am - 6:50 pm
ONT
-
GUM
19h 50m
2 stops
United Airlines Logo
7:25 am - 12:20 pm
GUM
-
ONT
21h 55m
2 stops
$2,229United Airlines
Mon, Oct 26 - Fri, Oct 30
United Airlines Logo
1:50 pm - 6:05 pm
ONT
-
GUM
35h 15m
2 stops
United Airlines Logo
7:05 am - 9:55 pm
GUM
-
ONT
31h 50m
2 stops
$2,324United Airlines
Mon, Jun 1 - Mon, Jun 8
United Airlines Logo
5:00 am - 6:05 pm
ONT
-
GUM
44h 05m
2 stops
United Airlines Logo
7:05 am - 3:29 pm
GUM
-
ONT
25h 24m
2 stops
$2,331United Airlines
Sun, Jun 7 - Tue, Jul 7

United Airlines flights from Ontario to Guam

Our best United Airlines deals on Ontario to Guam flight tickets
United Airlines
Oct 22
ONT6:05 amOntario
19h 00m
2 stops
GUM6:05 pmTamuning Guam Intl
Oct 30
GUM7:25 amTamuning Guam Intl
22h 08m
2 stops
ONT12:33 pmOntario
$1,919
United Airlines
Aug 25
ONT6:00 amOntario
19h 05m
2 stops
GUM6:05 pmTamuning Guam Intl
Sep 8
GUM7:10 amTamuning Guam Intl
22h 02m
2 stops
ONT12:12 pmOntario
$1,969
United Airlines
Jul 10
ONT6:00 amOntario
40h 50m
2 stops
GUM3:50 pmTamuning Guam Intl
Jul 17
GUM7:30 pmTamuning Guam Intl
44h 20m
2 stops
ONT10:50 pmOntario
$2,106

Delta flights from Ontario to Guam

Our best Delta deals on Ontario to Guam flight tickets
Delta
Oct 23
ONT7:00 amOntario
23h 55m
2 stops
GUM11:55 pmTamuning Guam Intl
Nov 15
GUM4:50 pmTamuning Guam Intl
42h 27m
2 stops
ONT5:17 pmOntario
$1,802
Delta
Oct 23
ONT6:00 amOntario
24h 55m
2 stops
GUM11:55 pmTamuning Guam Intl
Nov 14
GUM4:50 pmTamuning Guam Intl
42h 27m
2 stops
ONT5:17 pmOntario
$1,854

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 May 8, 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

Fri 10/23

7:00 am-11:55 pm

2 stops23h 55m

Tamuning Guam Intl

Sun 11/15

4:50 pm-5:17 pm

2 stops42h 27m

$1,802

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Fri 10/23

6:00 am-11:55 pm

2 stops24h 55m

Tamuning Guam Intl

Sat 11/14

4:50 pm-5:17 pm

2 stops42h 27m

$1,854

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 10/22

6:05 am-6:05 pm

2 stops19h 00m

Tamuning Guam Intl

Fri 10/30

7:25 am-12:33 pm

2 stops22h 08m

$1,919

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Tue 8/25

6:00 am-6:05 pm

2 stops19h 05m

Tamuning Guam Intl

Tue 9/8

7:10 am-12:12 pm

2 stops22h 02m

$1,969

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Fri 7/10

6:00 am-3:50 pm

2 stops40h 50m

Tamuning Guam Intl

Fri 7/17

7:30 pm-10:50 pm

2 stops44h 20m

$2,106
Quickest round-trip

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Thu 10/8

6:05 am-6:05 pm

2 stops19h 00m

Tamuning Guam Intl

Tue 10/13

7:10 am-12:12 pm

2 stops22h 02m

$2,179

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Sat 9/5

9:01 am-9:45 pm

2 stops19h 44m

Tamuning Guam Intl

Sat 10/3

7:10 am-12:12 pm

2 stops22h 02m

$2,215

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 10/26

6:00 am-6:50 pm

2 stops19h 50m

Tamuning Guam Intl

Fri 10/30

7:25 am-12:20 pm

2 stops21h 55m

$2,229

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Mon 6/1

1:50 pm-6:05 pm

2 stops35h 15m

Tamuning Guam Intl

Mon 6/8

7:05 am-9:55 pm

2 stops31h 50m

$2,324

OntarioTamuning

ONT - GUM

ONTGUM

Ontario

Sun 6/7

5:00 am-6:05 pm

2 stops44h 05m

Tamuning Guam Intl

Tue 7/7

7:05 am-3:29 pm

2 stops25h 24m

$2,331

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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.
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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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