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Cheap flights from Harlingen, Texas to London from $727

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 8/14. 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
0 bags

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Find the cheapest flights from Harlingen, Texas to London

Cheap round-trip flights

United Airlines Logo
5:10 am - 5:55 amHRL-LHR
18h 45m2 stops
United Airlines Logo
8:30 am - 9:52 pmLHR-HRL
19h 22m2 stops
$727United Airlines
Find Deal
Thu, Aug 14 - Sun, Aug 31
United Airlines Logo
1:59 pm - 11:35 amHRL-LHR
15h 36m1 stop
United Airlines Logo
8:30 am - 9:52 pmLHR-HRL
19h 22m2 stops
$728United Airlines
Find Deal
Thu, Aug 14 - Sun, Aug 31
United Airlines Logo
5:20 pm - 11:35 amHRL-LHR
12h 15m1 stop
United Airlines Logo
8:30 am - 11:18 pmLHR-HRL
20h 48m2 stops
$738United 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
10:00 am - 11:18 pmLHR-HRL
19h 18m1 stop
$740United Airlines
Find Deal
Thu, Sep 11 - Mon, Sep 29

United Airlines flights from Harlingen, Texas to London

Our best United Airlines deals on Harlingen, Texas to London flight tickets
United Airlines
Aug 14
HRL5:10 amHarlingen Valley Intl
18h 45m
2 stops
LHR5:55 amLondon Heathrow
Aug 31
LHR8:30 amLondon Heathrow
19h 22m
2 stops
HRL9:52 pmHarlingen Valley Intl
$727
Find similar
United Airlines
Aug 14
HRL1:59 pmHarlingen Valley Intl
15h 36m
1 stop
LHR11:35 amLondon Heathrow
Aug 31
LHR8:30 amLondon Heathrow
19h 22m
2 stops
HRL9:52 pmHarlingen Valley Intl
$728
Find similar
United Airlines
Sep 11
HRL5:20 pmHarlingen Valley Intl
12h 15m
1 stop
LHR11:35 amLondon Heathrow
Sep 29
LHR8:30 amLondon Heathrow
20h 48m
2 stops
HRL11:18 pmHarlingen Valley Intl
$738
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Harlingen, Texas to London 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 2, 2025.
Use the filters below to find and compare flights from Harlingen, Texas to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Thu 8/14

5:10 am-5:55 am

2 stops18h 45m

London Heathrow

Sun 8/31

8:30 am-9:52 pm

2 stops19h 22m

$727

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Thu 8/14

1:59 pm-11:35 am

1 stop15h 36m

London Heathrow

Sun 8/31

8:30 am-9:52 pm

2 stops19h 22m

$728

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Thu 9/11

5:20 pm-11:35 am

1 stop12h 15m

London Heathrow

Mon 9/29

8:30 am-11:18 pm

2 stops20h 48m

$738

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Thu 9/11

7:00 am-5:55 am

2 stops16h 55m

London Heathrow

Mon 9/29

10:00 am-11:18 pm

1 stop19h 18m

$740

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

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?

The cheapest day to depart from Harlingen, Texas to London is on a Saturday. Travelers who choose to depart for London on a Saturday will often find tickets for as low as $798. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $1,560. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

Flying to London from Harlingen, Texas in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $798 when looking at flights departing in the afternoon. Flights to London are more costly in the morning, with an average ticket price of $919. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

When to book flights from Harlingen, Texas to London

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

Cheap Harlingen, Texas to London (HRL to LON) flight deals and tips

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

Best Price Found

$727

Fastest flight time

12h 15m

Direct flights

None

Airports in London

1 airport
The best flight deal from Harlingen, Texas to London found on momondo in the last 72 hours is $727
The fastest flight from Harlingen, Texas to London takes 12h 15m
There are no direct flights from Harlingen, Texas to London. Popular non-direct route for this connection is Harlingen Valley Intl Airport - London Heathrow Airport.
There is 1 airport near London: London Heathrow (LHR)
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  • How far is Harlingen Valley Intl to London by plane?

    Harlingen Valley Intl and London are 5125.1 mi apart from one another. Flights usually cover this in 12h 15m, 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?

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

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

    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.

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

    The travel and health documents required for your trip to London 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. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Harlingen, Texas to London?

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Dover
Slough
Luton
Dartford
Guildford
Milton Keynes
Stansted
Hayes
Crawley
Croydon
Chelmsford
Ilford
Brentwood
Colchester
Folkestone
Watford
Canterbury
Richmond

Why use momondo?

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

Finding the right flight to London from Harlingen is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to London quick and easy, saving you time and money.

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

momondo does allow users to show only those flights to London from Harlingen which offer a flexible booking policy as well as other useful filters and features.

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?

Price alerts on flights to London from Harlingen 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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Thu 8/7
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Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London
London City Airport
London Gatwick Airport
London Heathrow Airport
London Luton Airport
London Southend Airport
London Stansted Airport