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Cheap flights from Harlingen, Texas to London Heathrow Airport from £557

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 29/3. Fares are subject to change and may not be available on all flights or dates of travel.
HRL — LHR
14 Nov — 21 Nov1
1 adult
1 adult, Economy

Cheap flight deals from Harlingen to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Harlingen (HRL) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 15 October 2025.

Round-trip from

£557
United Airlines
  • United Airlines
  • 29/3-8/4
  • 4 total stops
  • 40h 49m total
  • Harlingen to London
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Best flights from Harlingen to Heathrow
Discover carefully curated flight deals from Harlingen to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 15 October 2025.

Sun 29/305:15HRL - LHR
2 stops22h 45mUnited Airlines
Wed 8/407:25LHR - HRL
2 stops18h 04mUnited Airlines
Deal found 12/10£557
Sun 4/107:00HRL - LHR
2 stops41h 30mMultiple Airlines
Fri 16/111:10LHR - HRL
2 stops40h 49mMultiple Airlines
Deal found 14/10£632
Fri 27/309:20HRL - LHR
1 stop17h 10mUnited Airlines
Tue 31/306:30LHR - HRL
2 stops21h 14mUnited Airlines
Deal found 12/10£592
Sun 4/107:00HRL - LHR
1 stop21h 15mUnited Airlines
Fri 16/113:00LHR - HRL
2 stops33h 06mUnited Airlines
Deal found 14/10£622

Cheapflights Fare Finder

 
Customise your flight search to find flights from Harlingen to Heathrow 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, Cheapflights users made 858,174 searches. Data last updated 15 October 2025.
Use the filters below to find and compare flights from Harlingen to London Heathrow Airport that are best for you.

Fly from

Harlingen

Fly to

Heathrow

Route

Depart

Return

Price

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Sun 29/3

05:15-10:00

2 stops22h 45m

London Heathrow

Wed 8/4

07:25-19:29

2 stops18h 04m

£557

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Fri 27/3

09:20-07:30

1 stop17h 10m

London Heathrow

Tue 31/3

06:30-21:44

2 stops21h 14m

£592

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Sun 4/1

07:00-10:15

1 stop21h 15m

London Heathrow

Fri 16/1

13:00-16:06

2 stops33h 06m

£622

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Sun 4/1

07:00-06:30

2 stops41h 30m

London Heathrow

Fri 16/1

11:10-21:59

2 stops40h 49m

£632

HarlingenLondon

HRL - LHR

HRLLHR

Harlingen Valley Intl

Thu 25/12

14:48-08:35

1 stop11h 47m

£811

Flights are sorted by cheapest return flights first.

Deals found on 14/10

Best time to book a flight from Harlingen to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Harlingen 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 Harlingen to London Heathrow Airport

What is the cheapest month to book a flight from Harlingen, Texas to London Heathrow Airport?

Currently, November is the cheapest month in which you can book a flight from Harlingen, Texas to London Heathrow Airport (average of £460). Flying from Harlingen, Texas to London Heathrow Airport in June is currently the most expensive (average of £1,072). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

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

  • What airport do you fly from for flights from Harlingen to London Heathrow?

    Located just 3.7 mi from the city center, Harlingen Valley Intl is the airport most travelers will use when flying to London Heathrow from Harlingen. Booking flights from Valley Intl (HRL) to London Heathrow should be relatively easy as there are 0 daily outbound flights to London Heathrow from 0 different airlines.

  • How long is the flight from Harlingen, Texas to London Heathrow Airport?

    There are many flights that can get you from Harlingen, Texas to London Heathrow Airport in 22h 45m. Fly via United Airlines to get the fastest option. Harlingen, Texas and London Heathrow Airport are separated by a distance of 5109 mi.

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

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

  • How can I find direct flights from Harlingen to Heathrow?

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

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

    Yes. Cheapflights offers flight deals from Harlingen 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.

  • What is the cheapest month to book a flight from Harlingen, Texas to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from Harlingen, Texas to London Heathrow Airport (average of £460). Flying from Harlingen, Texas to London Heathrow Airport in June is currently the most expensive (average of £1,072). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Croydon
Slough
Gatwick
Hounslow
Northampton
Luton
Wembley
Deal
Ilford
Crawley
Hayes
Watford
Winchester
Swindon
Chichester
Romford
Ipswich
Brentford
Dartford

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

When you search for this flight from Harlingen 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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Can Cheapflights find flights from Harlingen to Heathrow with no change fees?

Yes! Cheapflights helps users easily find flights from Harlingen to Heathrow with no change fees.

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

Yes, Cheapflights offers price alerts on Harlingen to Heathrow flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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