$491 Find Cheap Flights from Harlingen to the United Kingdom - Compare and Save

1 adult
1 adult, Economy, 0 bags

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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 United Airlines ($865) and Iberia ($877).

Good to know

Cheapest flight

$491
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.
7.0
American AirlinesOverall score based on 12099 reviews
7.4Boarding
6.8Entertainment
7.9Crew
6.4Food
7.2Comfort
Airline reviews

Flight took additional prep time since plane came from Mexico, which resultrd in boarding and plane prep being delayed for additional cleaning procedures. Once boarded, plane tire was identified as being low on air and needed to be replaced, which creared the need to deboard and further delays for what was already a late night flight. Would have expected a better scheduled turn around and prep buffer that would have not created that degree of delay and deboarding

6.0 GoodRobert, Sep 2026
Read more American Airlines reviews

Flight took additional prep time since plane came from Mexico, which resultrd in boarding and plane prep being delayed for additional cleaning procedures. Once boarded, plane tire was identified as being low on air and needed to be replaced, which creared the need to deboard and further delays for what was already a late night flight. Would have expected a better scheduled turn around and prep buffer that would have not created that degree of delay and deboarding

The customer representative that helped me when I checked in was horrible as she told me I couldn’t check my bag because I missed the 45minute rule by 2 minutes - because of the line at the counter My connection flight was delayed too

The flight was normal, until it wasn't. I fell asleep after boarding, woke up still on the ground, the flight couldn't leave the gate due to mechanical issues, including a/c failure. The air felt thin, similar to high altitudes, not sure if that's why I fell asleep but it happened to the passenger next to me too. They hooked us up to external air but it didn't seem to help much. They finally decided to deboard us after nearly 2 1/2 hours. We reboarded about 45 minutes later and landed about 3 hours 15 minutes late. Some passengers got water or something but I was never offered either. Honestly, with that big of a delay, they should have provided full service to make sure their sweating passengers had fluids. Yes, it was a typical over 90 degree day in Texas. The lady in front of me said she was getting a heat rash. It was rough . . .

The boarding and flight announcements need to be honest and accurate. These were not. While flight delays cannot be avoided, please. be honest with the passengers in informing us about the timing of the delays. Deceptive delay times is not good business. Deceptive and/or grossly inaccurate boarding times are not good business either.

My number one reason for satisfaction is that there were no delays. Secondarily, the boarding process is always easy. The flight staff are friendly. I will say that the pretzels are not great. They need to revamp their snack offerings like what United has done.

Flight was delayed significantly at take off and landing. Confusion of gate assignment with back and forth. Overall, makes for a very unpleasant experience that appears to come down to inept operational management.

It was delayed a lot longer than 10 minutes because we arrived 45 minutes beyond our original arrival time. We sat on the tarmac waiting to take off for a very long time. The seats and entertainment options on American were not good and very limited. The ability to text via WiFi for free was nice, but that seems to be standard on mainline flights. Also, gold status really does not do anything for you anymore.

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

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