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Cheap flights from Harlingen, Texas to London from $621

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 1/15. 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.
Delta Logo
3:39 pm - 8:10 pmHRL-LHR
22h 31m2 stops
Delta Logo
11:05 am - 2:39 pmLHR-HRL
33h 34m1 stop
$621Delta
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Thu, Jan 15 - Wed, Jan 21
Delta Logo
4:07 pm - 6:20 amHRL-LHR
33h 13m2 stops
Delta Logo
3:50 pm - 3:12 pmLHR-HRL
28h 22m2 stops
$659Delta
Find Deal
Tue, Mar 10 - Mon, Mar 16
Delta Logo
4:07 pm - 7:05 amHRL-LHR
33h 58m1 stop
Delta Logo
4:10 pm - 3:12 pmLHR-HRL
28h 02m2 stops
$664Delta
Find Deal
Wed, Mar 18 - Tue, Mar 24
Delta Logo
4:07 pm - 7:05 amHRL-LHR
33h 58m1 stop
Delta Logo
11:05 am - 3:12 pmLHR-HRL
33h 07m1 stop
$665Delta
Find Deal
Wed, Mar 18 - Tue, Mar 24
Iberia Logo
3:22 pm - 11:40 amHRL-LHR
14h 18m1 stop
Iberia Logo
6:45 pm - 2:46 pmLHR-HRL
26h 01m2 stops
$666Iberia
Find Deal
Wed, Jan 14 - Wed, Jan 21
United Airlines Logo
9:20 am - 7:10 amHRL-LHR
15h 50m2 stops
United Airlines Logo
8:30 am - 9:59 pmLHR-HRL
19h 29m2 stops
$675United Airlines
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Wed, Jan 14 - Wed, Jan 21
Multiple Airlines Logo
11:06 am - 12:15 pmHRL-LHR
19h 09m1 stop
Multiple Airlines Logo
3:00 pm - 11:21 pmLHR-HRL
14h 21m1 stop
$694Multiple Airlines
Find Deal
Wed, Jan 14 - Wed, Jan 21
United Airlines Logo
5:25 pm - 10:15 amHRL-LHR
11h 50m1 stop
United Airlines Logo
11:30 am - 9:56 pmLHR-HRL
39h 26m2 stops
$696United Airlines
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Tue, Mar 10 - Mon, Mar 16
American Airlines Logo
2:45 pm - 8:15 amHRL-LHR
12h 30m1 stop
American Airlines Logo
8:20 am - 7:36 pmLHR-HRL
16h 16m1 stop
$714American Airlines
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Tue, Mar 10 - Mon, Mar 16
United Airlines Logo
7:00 am - 10:15 amHRL-LHR
21h 15m1 stop
United Airlines Logo
9:30 am - 9:59 pmLHR-HRL
18h 29m2 stops
$725United Airlines
Find Deal
Fri, Jan 16 - Tue, Jan 20

Iberia flights from Harlingen, Texas to London Heathrow Airport

Our best Iberia deals on Harlingen, Texas to London Heathrow Airport flight tickets
Iberia
Jan 14
HRL3:22 pmHarlingen Valley Intl
14h 18m
1 stop
LHR11:40 amLondon Heathrow
Jan 21
LHR6:45 pmLondon Heathrow
26h 01m
2 stops
HRL2:46 pmHarlingen Valley Intl
$666
Find similar
Iberia
Apr 1
HRL8:06 pmHarlingen Valley Intl
12h 19m
1 stop
LHR2:25 pmLondon Heathrow
Apr 10
LHR4:25 pmLondon Heathrow
13h 34m
1 stop
HRL11:59 pmHarlingen Valley Intl
$840
Find similar
Iberia
Dec 4
HRL12:13 pmHarlingen Valley Intl
12h 37m
1 stop
LHR6:50 amLondon Heathrow
Dec 13
LHR4:30 pmLondon Heathrow
23h 08m
1 stop
HRL9:38 amHarlingen Valley Intl
$909
Find similar

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
Jan 14
HRL9:20 amHarlingen Valley Intl
15h 50m
2 stops
LHR7:10 amLondon Heathrow
Jan 21
LHR8:30 amLondon Heathrow
19h 29m
2 stops
HRL9:59 pmHarlingen Valley Intl
$675
Find similar
United Airlines
Mar 10
HRL5:25 pmHarlingen Valley Intl
11h 50m
1 stop
LHR10:15 amLondon Heathrow
Mar 16
LHR11:30 amLondon Heathrow
39h 26m
2 stops
HRL9:56 pmHarlingen Valley Intl
$696
Find similar
United Airlines
Jan 16
HRL7:00 amHarlingen Valley Intl
21h 15m
1 stop
LHR10:15 amLondon Heathrow
Jan 20
LHR9:30 amLondon Heathrow
18h 29m
2 stops
HRL9:59 pmHarlingen Valley Intl
$725
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 December 2, 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 1/15

3:39 pm-8:10 pm

2 stops22h 31m

London Heathrow

Wed 1/21

11:05 am-2:39 pm

1 stop33h 34m

$621

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Tue 3/10

4:07 pm-6:20 am

2 stops33h 13m

London Heathrow

Mon 3/16

3:50 pm-3:12 pm

2 stops28h 22m

$659

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Wed 3/18

4:07 pm-7:05 am

1 stop33h 58m

London Heathrow

Tue 3/24

4:10 pm-3:12 pm

2 stops28h 02m

$664

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Wed 3/18

4:07 pm-7:05 am

1 stop33h 58m

London Heathrow

Tue 3/24

11:05 am-3:12 pm

1 stop33h 07m

$665

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Wed 1/14

3:22 pm-11:40 am

1 stop14h 18m

London Heathrow

Wed 1/21

6:45 pm-2:46 pm

2 stops26h 01m

$666

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Wed 1/14

9:20 am-7:10 am

2 stops15h 50m

London Heathrow

Wed 1/21

8:30 am-9:59 pm

2 stops19h 29m

$675

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Wed 1/14

11:06 am-12:15 pm

1 stop19h 09m

London Heathrow

Wed 1/21

3:00 pm-11:21 pm

1 stop14h 21m

$694

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Tue 3/10

5:25 pm-10:15 am

1 stop11h 50m

London Heathrow

Mon 3/16

11:30 am-9:56 pm

2 stops39h 26m

$696

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Tue 3/10

2:45 pm-8:15 am

1 stop12h 30m

London Heathrow

Mon 3/16

8:20 am-7:36 pm

1 stop16h 16m

$714

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Fri 1/16

7:00 am-10:15 am

1 stop21h 15m

London Heathrow

Tue 1/20

9:30 am-9:59 pm

2 stops18h 29m

$725

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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 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

Fastest flight time

12h 19m

Direct flights

None
The fastest flight from Harlingen, Texas to London Heathrow Airport takes 12h 19m
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 47m, 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
Dover
Luton
Slough
Guildford
Hayes
Dartford
Stratford-upon-Avon
Crawley
Brentwood
Salisbury
Wembley
Romford
Watford
Ilford
Cobham
Folkestone
Uxbridge

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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