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Cheap flights from Harlingen, Texas to London from $798

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Harlingen, Texas to London departing on 9/11. 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 Harlingen, Texas to London (HRL-LHR)

Cheap round-trip flights

United Airlines Logo
7:00 am - 5:55 amHRL-LHR
16h 55m2 stops
United Airlines Logo
1:30 pm - 11:18 pmLHR-HRL
39h 48m2 stops
$798United Airlines
Find Deal
Thu, Sep 11 - Mon, Sep 29
United Airlines Logo
7:00 am - 5:55 amHRL-LHR
16h 55m2 stops
United Airlines Logo
3:30 pm - 11:18 pmLHR-HRL
37h 48m2 stops
$799United Airlines
Find Deal
Thu, Sep 11 - Mon, Sep 29
United Airlines Logo
5:20 pm - 11:35 amHRL-LHR
12h 15m1 stop
United Airlines Logo
1:40 pm - 11:18 pmLHR-HRL
15h 38m1 stop
$840United Airlines
Find Deal
Thu, Sep 11 - Mon, Sep 29
United Airlines Logo
11:55 am - 11:35 amHRL-LHR
17h 40m1 stop
United Airlines Logo
10:00 am - 11:18 pmLHR-HRL
19h 18m1 stop
$841United Airlines
Find Deal
Thu, Sep 11 - Mon, Sep 29
United Airlines Logo
12:16 pm - 10:50 amHRL-LHR
16h 34m2 stops
United Airlines Logo
7:40 am - 7:36 pmLHR-HRL
17h 56m2 stops
$1,037United Airlines
Find Deal
Wed, Dec 17 - Mon, Dec 22
Iberia Logo
4:02 pm - 10:00 amHRL-LHR
11h 58m1 stop
Iberia Logo
11:55 am - 7:30 pmLHR-HRL
13h 35m1 stop
$1,334Iberia
Find Deal
Fri, Nov 14 - Wed, Nov 26

United Airlines flights from Harlingen, Texas to London Heathrow Airport

Our best United Airlines deals on Harlingen, Texas to London Heathrow Airport flight tickets
United Airlines
Sep 11
HRL7:00 amHarlingen Valley Intl
16h 55m
2 stops
LHR5:55 amLondon Heathrow
Sep 29
LHR1:30 pmLondon Heathrow
39h 48m
2 stops
HRL11:18 pmHarlingen Valley Intl
$798
Find similar
United Airlines
Sep 11
HRL7:00 amHarlingen Valley Intl
16h 55m
2 stops
LHR5:55 amLondon Heathrow
Sep 29
LHR3:30 pmLondon Heathrow
37h 48m
2 stops
HRL11:18 pmHarlingen Valley Intl
$799
Find similar
United Airlines
Sep 11
HRL5:20 pmHarlingen Valley Intl
12h 15m
1 stop
LHR11:35 amLondon Heathrow
Sep 29
LHR1:40 pmLondon Heathrow
15h 38m
1 stop
HRL11:18 pmHarlingen Valley Intl
$840
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Harlingen, Texas to London Heathrow Airport 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 21, 2025.
Use the filters below to find and compare flights from Harlingen, Texas to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Thu 9/11

7:00 am-5:55 am

2 stops16h 55m

London Heathrow

Mon 9/29

1:30 pm-11:18 pm

2 stops39h 48m

$798

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Thu 9/11

7:00 am-5:55 am

2 stops16h 55m

London Heathrow

Mon 9/29

3:30 pm-11:18 pm

2 stops37h 48m

$799

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Thu 9/11

5:20 pm-11:35 am

1 stop12h 15m

London Heathrow

Mon 9/29

1:40 pm-11:18 pm

1 stop15h 38m

$840

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Thu 9/11

11:55 am-11:35 am

1 stop17h 40m

London Heathrow

Mon 9/29

10:00 am-11:18 pm

1 stop19h 18m

$841

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Wed 12/17

12:16 pm-10:50 am

2 stops16h 34m

London Heathrow

Mon 12/22

7:40 am-7:36 pm

2 stops17h 56m

$1,037

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Fri 11/14

4:02 pm-10:00 am

1 stop11h 58m

London Heathrow

Wed 11/26

11:55 am-7:30 pm

1 stop13h 35m

$1,334

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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How to get the cheapest flight ticket from Harlingen, Texas to London Heathrow Airport

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 day to depart on your flight to London Heathrow Airport?

Our data shows that Tuesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $777. The most expensive day to fly to London Heathrow Airport is Thursday, with ticket prices averaging around $1,251.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the morning. momondo users have found flights departing from Harlingen, Texas to London Heathrow Airport in the morning for as low as $777. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the evening are often more expensive with an average ticket price of $838.

When to book flights from Harlingen, Texas to London Heathrow Airport

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

Cheap Harlingen, Texas to London Heathrow Airport (HRL to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Harlingen, Texas to London Heathrow Airport

Direct flights

None
There are no direct flights from Harlingen, Texas to London Heathrow Airport. There are no popular flight routes from Harlingen, Texas to London Heathrow Airport.
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  • How far is Harlingen Valley Intl to London Heathrow by plane?

    The straight-line distance from Harlingen Valley Intl to London Heathrow is 5112.7 mi. Flights usually cover this in 11h 58m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Harlingen Valley Intl Airport to London Heathrow Airport?

    Prices for flights from Harlingen Valley Intl Airport to London Heathrow Airport are refreshed on a daily basis.

  • How old do you have to be to fly from Harlingen Valley Intl Airport to London Heathrow 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 Harlingen Valley Intl Airport to London Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The travel and health documents required for your trip to London Heathrow Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London Heathrow Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Gatwick
Luton
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Slough
Milton Keynes
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Crawley
Hayes
Chelmsford
Salisbury
Stansted
Brentwood
Ilford
Folkestone
Swindon
Colchester
Stratford-upon-Avon
Watford

Why use momondo?

Why should I use momondo to find a flight deal from Harlingen to London?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Harlingen to London. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Harlingen to London with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Harlingen to London flights to just show those with flexible booking policies.

How can momondo help me find flights from Harlingen to London?

momondo helps you find the best flight between Harlingen and London 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 Harlingen to London right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to London from Harlingen. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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