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Cheap flights from Harlingen, Texas to London from $554

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Harlingen, Texas to London departing on 3/13. 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

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
2:36 pm - 8:15 am
HRL
-
LHR
12h 39m
1 stop
American Airlines Logo
4:10 pm - 10:12 am
LHR
-
HRL
23h 02m
1 stop
$661American Airlines
Tue, Mar 10 - Mon, Mar 16
Iberia Logo
10:42 am - 8:15 am
HRL
-
LHR
16h 33m
1 stop
Iberia Logo
8:20 am - 6:16 pm
LHR
-
HRL
14h 56m
1 stop
$662Iberia
Wed, Mar 18 - Tue, Mar 24
United Airlines Logo
5:25 pm - 10:15 am
HRL
-
LHR
11h 50m
1 stop
United Airlines Logo
10:30 am - 7:56 pm
LHR
-
HRL
38h 26m
2 stops
$665United Airlines
Tue, Mar 10 - Mon, Mar 16
United Airlines Logo
5:25 pm - 10:15 am
HRL
-
LHR
11h 50m
1 stop
United Airlines Logo
8:00 am - 7:56 pm
LHR
-
HRL
16h 56m
2 stops
$666United Airlines
Wed, Mar 18 - Tue, Mar 24
Iberia Logo
10:47 am - 6:20 am
HRL
-
LHR
13h 33m
1 stop
Iberia Logo
6:10 am - 10:51 pm
LHR
-
HRL
22h 41m
2 stops
$698Iberia
Fri, May 1 - Thu, May 7
United Airlines Logo
12:10 pm - 7:40 am
HRL
-
LHR
13h 30m
1 stop
United Airlines Logo
9:30 am - 11:23 am
LHR
-
HRL
31h 53m
2 stops
$710United Airlines
Fri, May 1 - Thu, May 7
American Airlines Logo
10:42 am - 8:15 am
HRL
-
LHR
16h 33m
1 stop
American Airlines Logo
4:10 pm - 10:12 am
LHR
-
HRL
23h 02m
1 stop
$712American Airlines
Tue, Mar 10 - Mon, Mar 16
Air Canada Logo
9:20 am - 9:35 am
HRL
-
LHR
18h 15m
2 stops
Air Canada Logo
5:40 pm - 11:23 am
LHR
-
HRL
47h 43m
2 stops
$721Air Canada
Fri, May 1 - Thu, May 7
Multiple Airlines Logo
2:47 pm - 10:55 am
HRL
-
LHR
14h 08m
1 stop
Multiple Airlines Logo
12:55 pm - 10:51 pm
LHR
-
HRL
15h 56m
1 stop
$728Multiple Airlines
Fri, May 1 - Thu, May 7
United Airlines Logo
7:00 am - 8:30 am
HRL
-
LHR
19h 30m
2 stops
United Airlines Logo
4:40 pm - 9:56 pm
LHR
-
HRL
34h 16m
2 stops
$837United Airlines
Fri, Mar 6 - Wed, Mar 11

Austrian Airlines flights from Harlingen, Texas to London Heathrow Airport

Our best Austrian Airlines deals on Harlingen, Texas to London Heathrow Airport flight tickets
Austrian Airlines
Jun 20
HRL5:16 pmHarlingen Valley Intl
30h 39m
2 stops
LHR5:55 amLondon Heathrow
Jun 27
LHR9:30 amLondon Heathrow
33h 44m
2 stops
HRL1:14 pmHarlingen Valley Intl
$1,251
Austrian Airlines
Jun 20
HRL5:16 pmHarlingen Valley Intl
32h 24m
1 stop
LHR7:40 amLondon Heathrow
Jun 27
LHR9:30 amLondon Heathrow
33h 44m
2 stops
HRL1:14 pmHarlingen Valley Intl
$1,330

Air Canada flights from Harlingen, Texas to London Heathrow Airport

Our best Air Canada deals on Harlingen, Texas to London Heathrow Airport flight tickets
Air Canada
May 1
HRL9:20 amHarlingen Valley Intl
18h 15m
2 stops
LHR9:35 amLondon Heathrow
May 7
LHR5:40 pmLondon Heathrow
47h 43m
2 stops
HRL11:23 amHarlingen Valley Intl
$721
Air Canada
Jun 30
HRL5:15 amHarlingen Valley Intl
22h 20m
2 stops
LHR9:35 amLondon Heathrow
Jul 15
LHR2:05 pmLondon Heathrow
37h 39m
2 stops
HRL9:44 pmHarlingen Valley Intl
$1,102
Air Canada
Jul 1
HRL5:16 pmHarlingen Valley Intl
34h 44m
2 stops
LHR10:00 amLondon Heathrow
Jul 15
LHR2:05 pmLondon Heathrow
37h 39m
2 stops
HRL9:44 pmHarlingen Valley Intl
$1,143

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 January 29, 2026.
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

Tue 3/10

2:36 pm-8:15 am

1 stop12h 39m

London Heathrow

Mon 3/16

4:10 pm-10:12 am

1 stop23h 02m

$661

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Wed 3/18

10:42 am-8:15 am

1 stop16h 33m

London Heathrow

Tue 3/24

8:20 am-6:16 pm

1 stop14h 56m

$662

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Tue 3/10

5:25 pm-10:15 am

1 stop11h 50m

London Heathrow

Mon 3/16

10:30 am-7:56 pm

2 stops38h 26m

$665

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Wed 3/18

5:25 pm-10:15 am

1 stop11h 50m

London Heathrow

Tue 3/24

8:00 am-7:56 pm

2 stops16h 56m

$666

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Fri 5/1

10:47 am-6:20 am

1 stop13h 33m

London Heathrow

Thu 5/7

6:10 am-10:51 pm

2 stops22h 41m

$698

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Fri 5/1

12:10 pm-7:40 am

1 stop13h 30m

London Heathrow

Thu 5/7

9:30 am-11:23 am

2 stops31h 53m

$710

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Tue 3/10

10:42 am-8:15 am

1 stop16h 33m

London Heathrow

Mon 3/16

4:10 pm-10:12 am

1 stop23h 02m

$712

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Fri 5/1

9:20 am-9:35 am

2 stops18h 15m

London Heathrow

Thu 5/7

5:40 pm-11:23 am

2 stops47h 43m

$721

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Fri 5/1

2:47 pm-10:55 am

1 stop14h 08m

London Heathrow

Thu 5/7

12:55 pm-10:51 pm

1 stop15h 56m

$728

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Fri 3/6

7:00 am-8:30 am

2 stops19h 30m

London Heathrow

Wed 3/11

4:40 pm-9:56 pm

2 stops34h 16m

$837

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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See travel insights to London from

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 airline that flies from Harlingen Valley Intl to London Heathrow?

United Airlines and Iberia are the most popular carriers operating from Harlingen Valley Intl to London Heathrow

What airlines fly to London Heathrow Airport?

United Airlines, British Airways and American Airlines are the top three most popular airlines that fly to London Heathrow Airport from Harlingen, Texas according to our data. United Airlines is the first choice among our users, with 44% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 3 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

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

Fastest flight time

11h 59m

Direct flights

None
The fastest flight from Harlingen, Texas to London Heathrow Airport takes 11h 59m
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.
Search flight deals

  • 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 59m, 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
Gatwick
Hounslow
Milton Keynes
Luton
Dover
Slough
Guildford
Crawley
Wembley
Dartford
Hayes
Stratford-upon-Avon
Brentwood
Harrow
Watford
Cobham
Folkestone
Romford
Stansted
Croydon

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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