In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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

When flying from Guam to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

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

How can I find direct flights from Guam to Heathrow?

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

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

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

£943+ Flights from Guam to London Heathrow Airport

Cheap flight deals from Guam to Heathrow

Round-trip from	£943

11/2-16/2
4 total stops
89h 05m total
Guam to London

Search Deals

Find flight deals from Guam to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Guam to Heathrow
Explore the most affordable flight options available from Guam to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 January 2026.

Wed 11/205:45

GUM

LHR

2 stops42h 05m

Multiple Airlines

Mon 16/219:00

LHR

GUM

2 stops47h 00m

Multiple Airlines

Deal found 14/1£943

Sun 5/706:00

GUM

LHR

2 stops43h 10m

Multiple Airlines

Sat 11/716:50

LHR

GUM

2 stops50h 30m

Multiple Airlines

Deal found 14/1£985

Sat 4/706:00

GUM

LHR

2 stops41h 25m

Multiple Airlines

Fri 10/719:50

LHR

GUM

2 stops47h 30m

Multiple Airlines

Deal found 14/1£1,145

Sun 5/717:00

GUM

LHR

1 stop33h 20m

Korean Air

Sat 11/719:35

LHR

GUM

1 stop34h 40m

Korean Air

Deal found 13/1£1,488

Tue 10/201:00

GUM

LHR

1 stop25h 30m

Korean Air

Mon 16/218:50

LHR

GUM

1 stop18h 15m

Korean Air

Deal found 15/1£1,961

Best flights from Guam to Heathrow
Discover carefully curated flight deals from Guam to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 16 January 2026.

Wed 11/205:45

GUM

LHR

2 stops42h 05m

Multiple Airlines

Mon 16/219:00

LHR

GUM

2 stops47h 00m

Multiple Airlines

Deal found 14/1£943

Sun 5/717:00

GUM

LHR

1 stop33h 20m

Korean Air

Sat 11/719:35

LHR

GUM

1 stop34h 40m

Korean Air

Deal found 13/1£1,488

Sun 5/706:00

GUM

LHR

2 stops43h 10m

Multiple Airlines

Sat 11/716:50

LHR

GUM

2 stops50h 30m

Multiple Airlines

Deal found 14/1£985

Sat 4/706:00

GUM

LHR

2 stops41h 25m

Multiple Airlines

Fri 10/719:50

LHR

GUM

2 stops47h 30m

Multiple Airlines

Deal found 14/1£1,145

Tue 10/201:00

GUM

LHR

1 stop25h 30m

Korean Air

Mon 16/218:50

LHR

GUM

1 stop18h 15m

Korean Air

Deal found 15/1£1,961

Last-minute flights from Guam to Heathrow
Discover last-minute flight deals from Guam to Heathrow. Data last updated 16 January 2026 and is based on user searches.

Tue 10/201:00

GUM

LHR

1 stop25h 30m

Korean Air

Mon 16/218:50

LHR

GUM

1 stop18h 15m

Korean Air

Deal found 15/1£1,961

Wed 11/205:45

GUM

LHR

2 stops42h 05m

Multiple Airlines

Mon 16/219:00

LHR

GUM

2 stops47h 00m

Multiple Airlines

Deal found 14/1£943

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

TamuningLondon

GUM - LHR

GUMLHR

Tamuning Guam Intl

Wed 11/2

05:45-13:50

2 stops42h 05m

London Heathrow

Mon 16/2

19:00-04:00

2 stops47h 00m

£943

TamuningLondon

GUM - LHR

GUMLHR

Tamuning Guam Intl

Sun 5/7

06:00-16:10

2 stops43h 10m

London Heathrow

Sat 11/7

16:50-04:20

2 stops50h 30m

£985

TamuningLondon

GUM - LHR

GUMLHR

Tamuning Guam Intl

Sat 4/7

06:00-14:25

2 stops41h 25m

London Heathrow

Fri 10/7

19:50-04:20

2 stops47h 30m

£1,145

TamuningLondon

GUM - LHR

GUMLHR

Tamuning Guam Intl

Sun 5/7

17:00-17:20

1 stop33h 20m

London Heathrow

Sat 11/7

19:35-15:15

1 stop34h 40m

£1,488

TamuningLondon

GUM - LHR

GUMLHR

Tamuning Guam Intl

Tue 10/2

01:00-16:30

1 stop25h 30m

London Heathrow

Mon 16/2

18:50-23:05

1 stop18h 15m

£1,961

Flights are sorted by cheapest return flights first.

Deals found on 14/1

Best time to book a flight from Guam to Heathrow

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

Estimated return 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 Guam to London Heathrow Airport

No data available for this route at this time. Please check back soon.

Related info for your journey

Can I find deals for flights from Guam to Heathrow that include hotel bookings?
Yes. In addition to deals on Guam to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Guam to Heathrow?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Guam to Heathrow.
Can I find deals for business class flights from Guam to Heathrow?
Yes. Cheapflights offers flight deals from Guam to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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When you search for this flight from Guam to Heathrow, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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Cheap flights from Guam to London Heathrow Airport from £943

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/2. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Guam to Heathrow

Keep the following information in mind while searching for Guam to Heathrow flight deals. Data was last updated 16 January 2026.

Round-trip from

Find flight deals from Guam to Heathrow

Cheapest flights from Guam to HeathrowExplore the most affordable flight options available from Guam to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 January 2026.

Explore the most affordable flight options available from Guam to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 January 2026.

Cheapflights Fare Finder

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

Best time to book a flight from Guam to Heathrow

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

Cheapflights Insights

Everything you need to know about your flight from Guam to London Heathrow Airport

Related info for your journey

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

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

How can I find direct flights from Guam to Heathrow?

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

Travelling to a place near London Heathrow Airport?

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 Guam to Heathrow

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

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Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Guam to Heathrow?

Why should you use Cheapflights to find cheap flight tickets from Guam to Heathrow?

Can Cheapflights find flights from Guam to Heathrow with no change fees?

Can Cheapflights notify me if prices for flights from Guam to Heathrow become cheaper?

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Cheapest flights from Guam to Heathrow
Explore the most affordable flight options available from Guam to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 January 2026.