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Cheap flights from Ontario to Tamuning from $1,657

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 Tamuning departing on 8/17. 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 Tamuning

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
6:00 am - 11:55 pmONT  Ontario-GUM Tamuning Guam Intl
24h 55m2 stops Seattle/Tacoma Intl Incheon Intl
Delta Logo
2:00 am - 10:40 pmGUM  Tamuning Guam Intl-ONT Ontario
37h 40m2 stops Incheon Intl Seattle/Tacoma Intl
$1,842Delta
Thu, Sep 17 - Tue, Sep 29
Delta Logo
6:00 am - 11:55 pmONT  Ontario-GUM Tamuning Guam Intl
24h 55m2 stops Seattle/Tacoma Intl Incheon Intl
Delta Logo
2:00 am - 10:40 pmGUM  Tamuning Guam Intl-ONT Ontario
37h 40m2 stops Incheon Intl Seattle/Tacoma Intl
$1,845Delta
Thu, Sep 17 - Tue, Sep 29
Delta Logo
6:00 am - 11:55 pmONT  Ontario-GUM Tamuning Guam Intl
24h 55m2 stops Seattle/Tacoma Intl Incheon Intl
Delta Logo
2:00 am - 10:40 pmGUM  Tamuning Guam Intl-ONT Ontario
37h 40m2 stops Incheon Intl Seattle/Tacoma Intl
$1,854Delta
Mon, Sep 21 - Sun, Sep 27
United Airlines Logo
6:07 am - 6:05 pmONT  Ontario-GUM Tamuning Guam Intl
18h 58m2 stops San Francisco Honolulu
United Airlines Logo
7:45 am - 12:33 pmGUM  Tamuning Guam Intl-ONT Ontario
21h 48m2 stops Honolulu Denver Intl
$1,869United Airlines
Mon, Oct 19 - Tue, Oct 27
United Airlines Logo
6:00 am - 7:00 pmONT  Ontario-GUM Tamuning Guam Intl
19h 00m2 stops San Francisco Honolulu
United Airlines Logo
7:45 am - 12:33 pmGUM  Tamuning Guam Intl-ONT Ontario
22h 48m2 stops Honolulu Denver Intl
$1,919United Airlines
Mon, Nov 16 - Fri, Nov 27
United Airlines Logo
6:00 am - 6:05 pmONT  Ontario-GUM Tamuning Guam Intl
19h 05m2 stops San Francisco Honolulu
United Airlines Logo
7:10 am - 12:18 pmGUM  Tamuning Guam Intl-ONT Ontario
22h 08m2 stops Honolulu San Francisco
$1,969United Airlines
Fri, Oct 9 - Fri, Oct 16
United Airlines Logo
11:20 am - 9:45 pmONT  Ontario-GUM Tamuning Guam Intl
40h 25m2 stops San Francisco Tokyo Narita
United Airlines Logo
7:45 am - 12:15 pmGUM  Tamuning Guam Intl-ONT Ontario
22h 30m2 stops Honolulu San Francisco
$2,004United Airlines
Sun, Dec 20 - Mon, Dec 28
United Airlines Logo
6:00 am - 7:00 pmONT  Ontario-GUM Tamuning Guam Intl
19h 00m2 stops San Francisco Honolulu
United Airlines Logo
7:45 am - 12:33 pmGUM  Tamuning Guam Intl-ONT Ontario
22h 48m2 stops Honolulu Denver Intl
$2,069United Airlines
Sun, Jan 3 - Sun, Jan 10
United Airlines Logo
6:08 am - 6:05 pmONT  Ontario-GUM Tamuning Guam Intl
18h 57m2 stops San Francisco Honolulu
United Airlines Logo
7:10 am - 10:23 amGUM  Tamuning Guam Intl-ONT Ontario
20h 13m2 stops Honolulu San Francisco
$2,179United Airlines
Thu, Sep 17 - Wed, Sep 30
United Airlines Logo
11:10 am - 6:05 pmONT  Ontario-GUM Tamuning Guam Intl
37h 55m2 stops San Francisco Honolulu
United Airlines Logo
7:10 am - 12:18 pmGUM  Tamuning Guam Intl-ONT Ontario
22h 08m2 stops Honolulu San Francisco
$2,194United Airlines
Sun, Oct 18 - Thu, Oct 22

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United Airlines flights from Ontario to Tamuning

Our best United Airlines deals on Ontario to Tamuning flight tickets
United Airlines
Oct 19
ONT6:07 amOntario
18h 58m
2 stops
GUM6:05 pmTamuning Guam Intl
Oct 27
GUM7:45 amTamuning Guam Intl
21h 48m
2 stops
ONT12:33 pmOntario
$1,869
United Airlines
Nov 16
ONT6:00 amOntario
19h 00m
2 stops
GUM7:00 pmTamuning Guam Intl
Nov 27
GUM7:45 amTamuning Guam Intl
22h 48m
2 stops
ONT12:33 pmOntario
$1,919
United Airlines
Oct 9
ONT6:00 amOntario
19h 05m
2 stops
GUM6:05 pmTamuning Guam Intl
Oct 16
GUM7:10 amTamuning Guam Intl
22h 08m
2 stops
ONT12:18 pmOntario
$1,969

Delta flights from Ontario to Tamuning

Our best Delta deals on Ontario to Tamuning flight tickets
Delta
Sep 17
ONT6:00 amOntario
24h 55m
2 stops
GUM11:55 pmTamuning Guam Intl
Sep 29
GUM2:00 amTamuning Guam Intl
37h 40m
2 stops
ONT10:40 pmOntario
$1,842
Delta
Sep 17
ONT6:00 amOntario
24h 55m
2 stops
GUM11:55 pmTamuning Guam Intl
Sep 29
GUM2:00 amTamuning Guam Intl
37h 40m
2 stops
ONT10:40 pmOntario
$1,845
Delta
Sep 21
ONT6:00 amOntario
24h 55m
2 stops
GUM11:55 pmTamuning Guam Intl
Sep 27
GUM2:00 amTamuning Guam Intl
37h 40m
2 stops
ONT10:40 pmOntario
$1,854

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Tamuning 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 11, 2026.
Use the filters below to find and compare flights from Ontario to Tamuning 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

Thu 9/17

6:00 am-11:55 pm

2 stops24h 55m

Tamuning Guam Intl

Tue 9/29

2:00 am-10:40 pm

2 stops37h 40m

$1,842

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Thu 9/17

6:00 am-11:55 pm

2 stops24h 55m

Tamuning Guam Intl

Tue 9/29

2:00 am-10:40 pm

2 stops37h 40m

$1,845

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Mon 9/21

6:00 am-11:55 pm

2 stops24h 55m

Tamuning Guam Intl

Sun 9/27

2:00 am-10:40 pm

2 stops37h 40m

$1,854

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Mon 10/19

6:07 am-6:05 pm

2 stops18h 58m

Tamuning Guam Intl

Tue 10/27

7:45 am-12:33 pm

2 stops21h 48m

$1,869

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Mon 11/16

6:00 am-7:00 pm

2 stops19h 00m

Tamuning Guam Intl

Fri 11/27

7:45 am-12:33 pm

2 stops22h 48m

$1,919

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Fri 10/9

6:00 am-6:05 pm

2 stops19h 05m

Tamuning Guam Intl

Fri 10/16

7:10 am-12:18 pm

2 stops22h 08m

$1,969

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Sun 12/20

11:20 am-9:45 pm

2 stops40h 25m

Tamuning Guam Intl

Mon 12/28

7:45 am-12:15 pm

2 stops22h 30m

$2,004

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Sun 1/3

6:00 am-7:00 pm

2 stops19h 00m

Tamuning Guam Intl

Sun 1/10

7:45 am-12:33 pm

2 stops22h 48m

$2,069
Quickest round-trip

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Thu 9/17

6:08 am-6:05 pm

2 stops18h 57m

Tamuning Guam Intl

Wed 9/30

7:10 am-10:23 am

2 stops20h 13m

$2,179

OntarioTamuning

ONT Ontario - GUM Tamuning Guam Intl

ONTGUM

Ontario

Sun 10/18

11:10 am-6:05 pm

2 stops37h 55m

Tamuning Guam Intl

Thu 10/22

7:10 am-12:18 pm

2 stops22h 08m

$2,194

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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See travel insights to Tamuning from

How to get the cheapest flight ticket from Ontario to Tamuning

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 Tamuning Guam Intl?

United Airlines is the most popular carrier operating from Ontario to Tamuning Guam Intl

When to book flights from Ontario to Tamuning

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Tamuning according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Tamuning (ONT to GUM) flight deals and tips

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

Fastest flight time

18h 57m

Direct flights

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

  • How far is Ontario to Tamuning Guam Intl by plane?

    Ontario and Tamuning Guam Intl are 6117.0 mi apart from one another. Typically, this will take 18h 57m by plane in normal conditions.

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

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

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

    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 Tamuning Guam Intl Airport.

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

    The necessary travel and health documents for your Tamuning Guam Intl Airport 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 Tamuning?

It is quick and easy to find Ontario to Tamuning flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Tamuning that suits you.

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

Flights from Ontario to Tamuning with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search for Ontario to Tamuning flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Price alerts on flights to Tamuning 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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