$714 Find Cheap Flights from Harlingen to the United Kingdom

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Harlingen to the United Kingdom departing on 4/1. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Book Cheap Harlingen to the United Kingdom Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Harlingen to the United Kingdom that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Harlingen to the United Kingdom

Wed, Apr 1 - Wed, Apr 15
Iberia Logo
10:42 am - 12:10 pm
HRL
-
LHR
19h 28m
1 stop
Iberia Logo
11:30 am - 10:17 am
LHR
-
HRL
28h 47m
2 stops
$714Iberia
Wed, Apr 8 - Wed, Apr 15
United Airlines Logo
9:20 am - 7:15 am
HRL
-
LHR
15h 55m
2 stops
United Airlines Logo
9:30 am - 9:59 pm
LHR
-
HRL
18h 29m
2 stops
$730United Airlines
Wed, Apr 1 - Wed, Apr 15
Iberia Logo
8:06 pm - 2:25 pm
HRL
-
LHR
12h 19m
1 stop
Iberia Logo
12:55 pm - 10:51 pm
LHR
-
HRL
15h 56m
1 stop
$742Iberia
Fri, May 1 - Thu, May 7
United Airlines Logo
5:18 pm - 11:35 am
HRL
-
LHR
12h 17m
1 stop
United Airlines Logo
9:30 am - 9:59 pm
LHR
-
HRL
18h 29m
2 stops
$775United Airlines
Fri, May 1 - Thu, May 7
United Airlines Logo
5:18 pm - 11:35 am
HRL
-
LHR
12h 17m
1 stop
United Airlines Logo
9:30 am - 9:59 pm
LHR
-
HRL
18h 29m
2 stops
$776United Airlines
Fri, May 1 - Thu, May 7
United Airlines Logo
7:00 am - 6:30 am
HRL
-
LHR
17h 30m
2 stops
United Airlines Logo
9:30 am - 9:59 pm
LHR
-
HRL
18h 29m
2 stops
$778United Airlines
Fri, May 1 - Thu, May 7
United Airlines Logo
7:00 am - 10:00 am
HRL
-
LHR
21h 00m
2 stops
United Airlines Logo
9:30 am - 9:59 pm
LHR
-
HRL
18h 29m
2 stops
$779United Airlines
Wed, Apr 1 - Wed, Apr 15
Air Canada Logo
5:18 pm - 9:35 am
HRL
-
LHR
34h 17m
2 stops
Air Canada Logo
12:05 pm - 11:23 am
LHR
-
HRL
29h 18m
2 stops
$791Air Canada
Fri, May 1 - Thu, May 7
Iberia Logo
7:53 pm - 2:25 pm
HRL
-
LHR
12h 32m
1 stop
Iberia Logo
8:55 am - 7:22 pm
LHR
-
HRL
16h 27m
1 stop
$792Iberia
Fri, May 1 - Thu, May 7
Iberia Logo
7:53 pm - 2:25 pm
HRL
-
LHR
12h 32m
1 stop
Iberia Logo
10:05 am - 7:22 pm
LHR
-
HRL
15h 17m
1 stop
$793Iberia
Booking Insights

KAYAK's insights & trends for Harlingen to the United Kingdom flights

Get data-powered insights and trends into flights from Harlingen to the United Kingdom to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Harlingen to the United Kingdom?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Harlingen to the United Kingdom were found on Iberia ($714) and United Airlines ($730).

Good to know

Cheapest flight$714
Flight from Harlingen to London

FAQs - booking United Kingdom flights

  • How does KAYAK find such low prices on flights from Harlingen to the United Kingdom?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Harlingen to the United Kingdom.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Harlingen to the United Kingdom?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Harlingen to the United Kingdom is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Harlingen to the United Kingdom?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Harlingen to the United Kingdom with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Harlingen to the United Kingdom?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Harlingen to the United Kingdom up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Harlingen to the United Kingdom

 
Need help choosing which airline to fly with from Harlingen to the United Kingdom? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9344 reviews
8.1Crew
7.1Entertainment
6.6Food
7.7Boarding
7.3Comfort
Airline reviews

Overall we had a good experience during our flight from San Francisco to Houston.

10.0 ExcellentAgustin, Feb 2026
IAH - SFO
Read more United Airlines reviews

Overall we had a good experience during our flight from San Francisco to Houston.

Airport terminal was outdated, flight was on a small jet with no wifi

The crew made our experience extremely bad. They were rude and didn’t have anything for kids.

Do not like the size of the overhead bin. I think staff should monitor the size of suitcases that are being carried on by passengers to ensure they meet the size requirement.

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

Delayed, toilets did not flush, pilot parked to far away from Gate

I like flying first class, and United has a nice one

Unbelievably poor service from flight attendants. They didn’t even do water service on a four hour flight. Just disrespectful.

Seats had less pitch than a regional jet. Food was OK. Have to buy alcohol on US based carriers flying international. Boarding was a mess. Did not have bags but overhead space was gone quick. Would like to see the airlines enforce the one bag over and one bag under policy

Lately I like the planes have been exceptionally filthy. There’s lines of dust and dirt all across the ceiling in the vents, and the cracks in between the seats are literally full of food. It’s definitely not the quality of service that I was used to with United. I’m also very disappointed with the Wi-Fi! All I wanna do is knock out a few work jobs while I’m trapped in my seat And it spools so bad. They did provide me with a refund, but the process of getting that refund is so complicated. It’s unfortunate.

Everything you need to know for your flight from Harlingen to the United Kingdom

Information on your arrival and departure airports