Latest deals
Insights
FAQs
Price Alerts

Cheap flights from Ontario to Guam from $743

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 10/26. 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.
Delta Logo
6:20 am - 11:55 pmONT  Ontario-GUM Tamuning Guam Intl
24h 35m2 stops Seattle/Tacoma Intl Incheon Intl
Delta Logo
2:40 am - 10:43 pmGUM  Tamuning Guam Intl-ONT Ontario
37h 03m2 stops Incheon Intl Seattle/Tacoma Intl
$1,754Delta
Wed, Oct 14 - Wed, Oct 28
Delta Logo
6:00 am - 11:55 pmONT  Ontario-GUM Tamuning Guam Intl
24h 55m2 stops Salt Lake City Incheon Intl
Delta Logo
2:40 am - 10:43 pmGUM  Tamuning Guam Intl-ONT Ontario
37h 03m2 stops Incheon Intl Seattle/Tacoma Intl
$1,754Delta
Mon, Oct 12 - Mon, Oct 26
Delta Logo
6:20 am - 11:55 pmONT  Ontario-GUM Tamuning Guam Intl
24h 35m2 stops Seattle/Tacoma Intl Incheon Intl
Delta Logo
2:40 am - 5:12 pmGUM  Tamuning Guam Intl-ONT Ontario
31h 32m2 stops Incheon Intl Seattle/Tacoma Intl
$1,754Delta
Wed, Oct 14 - Tue, Oct 27
Delta Logo
6:20 am - 11:55 pmONT  Ontario-GUM Tamuning Guam Intl
24h 35m2 stops Seattle/Tacoma Intl Incheon Intl
Delta Logo
2:40 am - 5:12 pmGUM  Tamuning Guam Intl-ONT Ontario
31h 32m2 stops Incheon Intl Seattle/Tacoma Intl
$1,754Delta
Mon, Oct 12 - Sun, Oct 25
Delta Logo
6:20 am - 11:55 pmONT  Ontario-GUM Tamuning Guam Intl
24h 35m2 stops Seattle/Tacoma Intl Incheon Intl
Delta Logo
2:40 am - 10:43 pmGUM  Tamuning Guam Intl-ONT Ontario
37h 03m2 stops Incheon Intl Seattle/Tacoma Intl
$1,754Delta
Mon, Oct 12 - Wed, Oct 28
Delta Logo
6:00 am - 11:55 pmONT  Ontario-GUM Tamuning Guam Intl
24h 55m2 stops Salt Lake City Incheon Intl
Delta Logo
2:40 am - 5:12 pmGUM  Tamuning Guam Intl-ONT Ontario
31h 32m2 stops Incheon Intl Seattle/Tacoma Intl
$1,754Delta
Wed, Oct 14 - Mon, Oct 26
Delta Logo
6:00 am - 11:55 pmONT  Ontario-GUM Tamuning Guam Intl
24h 55m2 stops Salt Lake City Incheon Intl
Delta Logo
2:40 am - 10:43 pmGUM  Tamuning Guam Intl-ONT Ontario
37h 03m2 stops Incheon Intl Seattle/Tacoma Intl
$1,754Delta
Tue, Oct 13 - Mon, Oct 26
Delta Logo
6:00 am - 11:55 pmONT  Ontario-GUM Tamuning Guam Intl
24h 55m2 stops Salt Lake City Incheon Intl
Delta Logo
2:40 am - 10:43 pmGUM  Tamuning Guam Intl-ONT Ontario
37h 03m2 stops Incheon Intl Seattle/Tacoma Intl
$1,754Delta
Tue, Oct 13 - Sun, Oct 25
Delta Logo
6:20 am - 11:55 pmONT  Ontario-GUM Tamuning Guam Intl
24h 35m2 stops Seattle/Tacoma Intl Incheon Intl
Delta Logo
2:40 am - 5:12 pmGUM  Tamuning Guam Intl-ONT Ontario
31h 32m2 stops Incheon Intl Seattle/Tacoma Intl
$1,754Delta
Wed, Oct 14 - Sun, Oct 25
Delta Logo
6:00 am - 11:55 pmONT  Ontario-GUM Tamuning Guam Intl
24h 55m2 stops Salt Lake City Incheon Intl
Delta Logo
2:40 am - 10:43 pmGUM  Tamuning Guam Intl-ONT Ontario
37h 03m2 stops Incheon Intl Seattle/Tacoma Intl
$1,754Delta
Tue, Oct 13 - Tue, Oct 27

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

United Airlines flights from Ontario to Guam

Our best United Airlines deals on Ontario to Guam flight tickets
United Airlines
Oct 7
ONT8:03 amOntario
17h 02m
2 stops
GUM6:05 pmTamuning Guam Intl
Oct 28
GUM7:45 amTamuning Guam Intl
21h 48m
2 stops
ONT12:33 pmOntario
$1,869
United Airlines
Nov 20
ONT6:00 amOntario
19h 00m
2 stops
GUM7:00 pmTamuning Guam Intl
Dec 7
GUM7:45 amTamuning Guam Intl
22h 35m
2 stops
ONT12:20 pmOntario
$1,919
United Airlines
Dec 16
ONT6:00 amOntario
19h 00m
2 stops
GUM7:00 pmTamuning Guam Intl
Dec 31
GUM7:45 amTamuning Guam Intl
22h 30m
2 stops
ONT12:15 pmOntario
$1,969

Delta flights from Ontario to Guam

Our best Delta deals on Ontario to Guam flight tickets
Delta
Oct 12
ONT6:00 amOntario
24h 55m
2 stops
GUM11:55 pmTamuning Guam Intl
Oct 26
GUM2:40 amTamuning Guam Intl
37h 03m
2 stops
ONT10:43 pmOntario
$1,754
Delta
Oct 11
ONT6:20 amOntario
24h 35m
2 stops
GUM11:55 pmTamuning Guam Intl
Oct 27
GUM2:40 amTamuning Guam Intl
37h 03m
2 stops
ONT10:43 pmOntario
$1,804
Delta
Sep 17
ONT6:00 amOntario
40h 35m
2 stops
GUM3:35 pmTamuning Guam Intl
Sep 29
GUM2:00 amTamuning Guam Intl
37h 40m
2 stops
ONT10:40 pmOntario
$1,841

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 August 7, 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 Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Wed 10/14

6:20 am-11:55 pm

2 stops24h 35m

Tamuning Guam Intl

Wed 10/28

2:40 am-10:43 pm

2 stops37h 03m

$1,754

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Mon 10/12

6:00 am-11:55 pm

2 stops24h 55m

Tamuning Guam Intl

Mon 10/26

2:40 am-10:43 pm

2 stops37h 03m

$1,754
Quickest round-trip

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Wed 10/14

6:20 am-11:55 pm

2 stops24h 35m

Tamuning Guam Intl

Tue 10/27

2:40 am-5:12 pm

2 stops31h 32m

$1,754

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Mon 10/12

6:20 am-11:55 pm

2 stops24h 35m

Tamuning Guam Intl

Sun 10/25

2:40 am-5:12 pm

2 stops31h 32m

$1,754

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Mon 10/12

6:20 am-11:55 pm

2 stops24h 35m

Tamuning Guam Intl

Wed 10/28

2:40 am-10:43 pm

2 stops37h 03m

$1,754

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Wed 10/14

6:00 am-11:55 pm

2 stops24h 55m

Tamuning Guam Intl

Mon 10/26

2:40 am-5:12 pm

2 stops31h 32m

$1,754

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Tue 10/13

6:00 am-11:55 pm

2 stops24h 55m

Tamuning Guam Intl

Mon 10/26

2:40 am-10:43 pm

2 stops37h 03m

$1,754

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Tue 10/13

6:00 am-11:55 pm

2 stops24h 55m

Tamuning Guam Intl

Sun 10/25

2:40 am-10:43 pm

2 stops37h 03m

$1,754

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Wed 10/14

6:20 am-11:55 pm

2 stops24h 35m

Tamuning Guam Intl

Sun 10/25

2:40 am-5:12 pm

2 stops31h 32m

$1,754

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Tue 10/13

6:00 am-11:55 pm

2 stops24h 55m

Tamuning Guam Intl

Tue 10/27

2:40 am-10:43 pm

2 stops37h 03m

$1,754

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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?

Alaska Airlines and Delta 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

17h 02m

Direct flights

None
The fastest flight from Ontario to Guam takes 17h 02m
There are no direct flights from Ontario to Guam. There are no popular flight routes from Ontario to Guam.
Search flight deals

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.

An easier way to manage your Guam trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sun 9/6
Sun 9/13
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Guam

Popular cities in Guam

Popular flights according to clicks in the last 7 days on momondo
Flights to Tamuningfrom $1,103