$807 Find Cheap Flights from Harlingen to the United Kingdom - Compare and Save

1 adult
1 adult, Economy, 0 bags

Save 21% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Flight Deals
Booking Insights
Flight Deals
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?

In the past 5 days, the cheapest round-trip tickets from Harlingen to the United Kingdom were found on Delta ($807) and Air Canada ($865).

Good to know

Cheapest flight

$807
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.
7.1
American AirlinesOverall score based on 12051 reviews
7.9Crew
7.2Comfort
6.4Food
7.4Boarding
6.8Entertainment
Airline reviews

Every time I fly American they end up delaying the flight significantly and claim it’s due to weather, however, it was a beautiful clear sunny day in Dallas today. Unfortunately, these significant delays occur more often than not which I don’t experience on any other airlines. Yet American Airlines consistently faults the weather and never holds itself accountable for the poor and unorganized service. I will keep my business with Delta, United, and JetBlue going forward. American Airlines should not be part of the “Big 3” considering United and Delta are light years ahead. JetBlue is also much ahead of American. American needs to step up big time

2.0 MediocreArsalan, Sep 2026
Read more American Airlines reviews

Every time I fly American they end up delaying the flight significantly and claim it’s due to weather, however, it was a beautiful clear sunny day in Dallas today. Unfortunately, these significant delays occur more often than not which I don’t experience on any other airlines. Yet American Airlines consistently faults the weather and never holds itself accountable for the poor and unorganized service. I will keep my business with Delta, United, and JetBlue going forward. American Airlines should not be part of the “Big 3” considering United and Delta are light years ahead. JetBlue is also much ahead of American. American needs to step up big time

Seems like the ac wasn’t working. It was super hot

American Airlines didn't allow us on the flight as there were delays for a ground stop that couldn't get our flight from Baltimore to the gate. When we needed help rebooking there wasn't a gate agent available to help us either.

The flight was delayed and was not forthright on the time that it was likely to depart where Flight Radar 24 was reflecting a later time that ended up being accurate for the takeoff. The plane was filthy with food smashed into the carpet and crumbs were piled under the seat where I was to put my backpack. It looked like a full sized Lotus Biscoff cookie was pulverized under the seats in my section. The seats were so uncomfortable especially when the person in front reclined his seat completely to where it was smashed against my knees and I am only 5'2". The fruit and cheese box for $13 was lackluster with no flavor and not satiating at all. The plus side is that I did get one full can of ginger ale. The flight attendants looked miserable and tired, probably due to the last minute need for a new flight attendant to fill in since the original one assigned could not continue on to service this flight. Improve the flight experience for customers and maybe the irritability and stress of flying in today's environment will not negatively impact the joy and stress of the employees/flight crew. This is why I prefer to fly non-US carriers whenever given the chance.

The big challenge here was that the inbound flight was delayed, THEN, the aircraft was deemed in need of service, so we had to deplane after being a few minutes away from departure, THEN we had to switch terminals, where another plane in our gate had maintenance issues so we had to change gates again. I am a regular flyer (not on American) so I understand these things happen. The crew was great. The pilot in particular was gracious and understanding and stayed with the passengers the whole time to answer questions and give updates - that was impressive. But the flight was massively delayed as a result, and today I really wanted to be home in time. Sigh The flight was otherwise great.

My original flight kept getting postponed multiple times, I would have missed my international flight if I waited. It was postponed through the next day. I ended up having to drive 3 hours away to get my next flight.

DFW notification of changing the gate notice was an inconvenience.

Comfort in premium economy is worth it for long hauls especially on the 787-9P Dreamliner with the modern updates. The food was okay. All 4 of us selected the same meal, 2 of us had very dry hard to cut chicken, the other 2 were tender and good. The sides/salad/dessert all very good as far as airline food goes. Crew were very attentive. Will be hard to ever go back to regular economy!

Not too impressed with them to be honest. They had forgotten my gf meal, despite the fact that the app had notified me that it was sorted. Apparently there is a ‘glitch’ in the system, according to one of the stewardesses, and has been for a while. Also the legroom in economy is way too small (and I’m a slight person) and are very uncomfortable. An extra Internal flight I booked via the app, had not even given me the option to order a meal, so was unaware of that and left without food on a 9 hr. flight !! Don’t think I’ll use AA again after this.

A 50 minutes flight that is delayed over 90 minutes kills every connection, thank you American Airlines

More options for your flight from Harlingen to the United Kingdom

Complete your trip to the United Kingdom with a hotel stay or car rental