In terms of precipitation, rainfall in Guam ranges from 2.6 - 14.4 inches per month. August is typically the wettest month, when rainfall can reach 14.4 in. March is typically the driest time to visit Guam when rainfall is around 2.6 in.

If weather is an important factor for your trip to Guam, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 80.6 F).

What is the cheapest time of day to fly from PWM to GU?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Portland, Maine to Guam as you normally would.

What airport do you fly from for flights from Portland to Guam?

Located just 2.9 mi from the city center, Portland (PWM) is the airport most travelers will use when flying to Guam from Portland.

Can I find deals for flights from Portland to Guam that include hotel bookings?

Yes. In addition to deals on Portland to Guam flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Portland to Guam?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to Guam.

Can I find deals for business class flights from Portland to Guam?

Yes. Cheapflights offers flight deals from Portland to Guam by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$2,507+ Flights from Portland, ME to Guam

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Cheap flight deals from Portland to Guam

Round-trip from	$2,269 (United Airlines)

From Portland to Guam

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Find flight deals from Portland to Guam

Cheapest flights from Portland to Guam
Explore the most affordable flight options available from Portland to Guam. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

Wed 11/55:30 amPWM - GUM

2 stops31h 50mUnited Airlines

Sun 11/97:05 pmGUM - PWM

2 stops41h 30mUnited Airlines

Deal found 7/2

$2,269

Best flights from Portland to Guam
Discover carefully curated flight deals from Portland to Guam that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 3, 2025.

Wed 11/55:30 amPWM - GUM

2 stops31h 50mUnited Airlines

Sun 11/97:05 pmGUM - PWM

2 stops41h 30mUnited Airlines

Deal found 7/2

$2,269

Last-minute flights from Portland to Guam
Discover last-minute flight deals from Portland to Guam. Data last updated July 3, 2025 and is based on user searches.

Sun 7/66:00 amPWM - GUM

2 stops32h 20mUnited Airlines

Tue 7/87:00 pmGUM - PWM

2 stops38h 27mUnited Airlines

Deal found 7/2

$3,219

Cheapflights Fare Finder

Use the filters below to find and compare flights from Portland to Guam that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandTamuning

PWM - GUM

PWMGUM

Portland

Wed 11/5

5:30 am-4:20 am

2 stops31h 50m

Tamuning Guam Intl

Sun 11/9

7:05 pm-9:35 pm

2 stops41h 30m

$2,269

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Best time to book a flight from Portland to Guam

Have a flexible travel schedule? Discover the best time to fly to Guam from Portland with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Portland to Guam

What is the cheapest month to book a flight from Portland, Maine to Guam?

Currently, January is the cheapest month in which you can book a flight from Portland, Maine to Guam (average of $1,977). Flying from Portland, Maine to Guam in May is currently the most expensive (average of $2,214). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Guam

Peruse reviews from past customers who have flown with United Airlines from Portland to Guam to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

8,845 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

United Airlines

7.4

Good

8,845 reviews

United Airlines

7.4

Good

8,845 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

What airport do you fly from for flights from Portland to Guam?
Located just 2.9 mi from the city center, Portland (PWM) is the airport most travelers will use when flying to Guam from Portland.
Can I find deals for flights from Portland to Guam that include hotel bookings?
Yes. In addition to deals on Portland to Guam flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Portland to Guam?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to Guam.
Can I find deals for business class flights from Portland to Guam?
Yes. Cheapflights offers flight deals from Portland to Guam by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Portland, Maine to Guam?
Currently, January is the cheapest month in which you can book a flight from Portland, Maine to Guam (average of $1,977). Flying from Portland, Maine to Guam in May is currently the most expensive (average of $2,214). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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$2,269+ Cheap flights from Portland, ME (PWM) to Guam

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/5. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Portland to Guam with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Portland to Guam

Keep the following information in mind while searching for Portland to Guam flight deals. Data was last updated July 3, 2025.

Round-trip from

Find flight deals from Portland to Guam

Cheapest flights from Portland to GuamExplore the most affordable flight options available from Portland to Guam. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

Explore the most affordable flight options available from Portland to Guam. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Portland to Guam that are best for you.

Best time to book a flight from Portland to Guam

Have a flexible travel schedule? Discover the best time to fly to Guam from Portland with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Portland to Guam

What is the cheapest month to book a flight from Portland, Maine to Guam?

Reviews of airlines servicing Guam

Get insights into the airlines that provide service to Guam. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Guam. Reviews last updated July 3, 2025.

Peruse reviews from past customers who have flown with United Airlines from Portland to Guam to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Portland to Guam. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights from Portland to Guam?

Can I find deals for flights from Portland to Guam that include hotel bookings?

How can I find direct flights from Portland to Guam?

Can I find deals for business class flights from Portland to Guam?

What is the cheapest month to book a flight from Portland, Maine to Guam?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Portland to Guam

See prices for flight routes from nearby airports that may be better suited for you.

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Portland to Guam
Explore the most affordable flight options available from Portland to Guam. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.