$403 Cheap Flights from Carlsbad (CLD) to London (LHR)

View $403 flight on Sun, Sep 7, 2025Opens in a new window

Popular airlines from Carlsbad, CA (CLD-McClellan-Palomar) to Heathrow Airport (LHR)

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • one key icon

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Carlsbad to London (CLD-LHR)

Prices were available within the past 7 days and start at $403 for one-way flights and $559 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Tue, Mar 31 - Tue, Apr 14
CLD
Carlsbad
LHR
London
$559 Roundtrip, found 6 days ago
$559
Roundtrip
found 6 days ago
Select American Airlines flight, departing Tue, Mar 31 from Carlsbad to London, returning Tue, Apr 14, priced at $559 found 6 days ago
American Airlines
Mon, Mar 23 - Thu, Apr 2
CLD
Carlsbad
LHR
London
$564 Roundtrip, found 6 days ago
$564
Roundtrip
found 6 days ago
Select American Airlines flight, departing Mon, Mar 23 from Carlsbad to London, returning Thu, Apr 2, priced at $564 found 6 days ago
American Airlines
Mon, Sep 22 - Fri, Oct 3
CLD
Carlsbad
LHR
London
$568 Roundtrip, just found
$568
Roundtrip
just found
Select American Airlines flight, departing Mon, Sep 22 from Carlsbad to London, returning Fri, Oct 3, priced at $568 just found
American Airlines
Sun, Aug 10 - Fri, Aug 22
CLD
Carlsbad
LHR
London
$568 Roundtrip, found 19 hours ago
$568
Roundtrip
found 19 hours ago
Select American Airlines flight, departing Sun, Aug 10 from Carlsbad to London, returning Fri, Aug 22, priced at $568 found 19 hours ago
American Airlines
Mon, Sep 22 - Thu, Oct 2
CLD
Carlsbad
LHR
London
$572 Roundtrip, just found
$572
Roundtrip
just found
Select American Airlines flight, departing Mon, Sep 22 from Carlsbad to London, returning Thu, Oct 2, priced at $572 just found
American Airlines
Wed, Nov 19 - Thu, Nov 27
CLD
Carlsbad
LHR
London
$583 Roundtrip, found 17 hours ago
$583
Roundtrip
found 17 hours ago
Select American Airlines flight, departing Wed, Nov 19 from Carlsbad to London, returning Thu, Nov 27, priced at $583 found 17 hours ago
American Airlines
Mon, Mar 23 - Thu, Apr 2
CLD
Carlsbad
LHR
London
$599 Roundtrip, found 6 days ago
$599
Roundtrip
found 6 days ago
Select American Airlines flight, departing Mon, Mar 23 from Carlsbad to London, returning Thu, Apr 2, priced at $599 found 6 days ago
American Airlines
Wed, Sep 10 - Wed, Sep 17
CLD
Carlsbad
LHR
London
$600 Roundtrip, found 3 hours ago
$600
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Wed, Sep 10 from Carlsbad to London, returning Wed, Sep 17, priced at $600 found 3 hours ago
American Airlines
Mon, Apr 6 - Sat, Apr 18
CLD
Carlsbad
LHR
London
$612 Roundtrip, found 15 hours ago
$612
Roundtrip
found 15 hours ago
Select American Airlines flight, departing Mon, Apr 6 from Carlsbad to London, returning Sat, Apr 18, priced at $612 found 15 hours ago
American Airlines
Wed, Aug 27 - Wed, Sep 10
CLD
Carlsbad
LHR
London
$614 Roundtrip, found 3 days ago
$614
Roundtrip
found 3 days ago
Select American Airlines flight, departing Wed, Aug 27 from Carlsbad to London, returning Wed, Sep 10, priced at $614 found 3 days ago
Flights from Carlsbad (CLD) to London (LHR)
Origin airport
McClellan-Palomar
Destination airport
Heathrow
Airlines serving
American Airlines
Roundtrip price
$559
Distance
5452 mi

Carlsbad to London Flights

The cheapest times to fly from Carlsbad to London

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Carlsbad to London are during the month of March. You can find some of the cheapest flights from Carlsbad to London with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Carlsbad to London

Sunday is one of the best days to book for cheap flights from Carlsbad to London: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Carlsbad to London

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Carlsbad to London in 2025. You can also book with separate airlines for your outbound and return journeys, from $403 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Carlsbad to London flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Carlsbad to London airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from McClellan-Palomar Airport (CLD) to Heathrow Airport (LHR) cost?
Discover the latest flight deals from CLD to LHR by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from CLD to LHR?
The cheapest flights from CLD to LHR are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from McClellan-Palomar Airport (CLD) to Heathrow Airport (LHR)?
While Carlsbad, CA (CLD-McClellan-Palomar) doesn't have any direct flights to Heathrow Airport (LHR), other airports have nonstop routes. Jetting off from San Diego Intl. Airport (SAN) will get you to London without any layovers.
What is the cheapest airline that flies from CLD to LHR?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from CLD to LHR. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from McClellan-Palomar Airport (CLD) to Heathrow Airport (LHR)?
You'll need to catch a flight with a layover if you're traveling from McClellan-Palomar Airport (CLD) to Heathrow Airport (LHR). There are no daily direct flights on this route. However, simply filter your search to include one or two stops to find the best option for your trip.
What day of the week has the most flights from CLD to LHR?
Friday is typically the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can change based on a number of factors, such as the time of year and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from McClellan-Palomar Airport (CLD) to Heathrow Airport (LHR)?
To land at Heathrow Airport (LHR) on time, pick a flight that takes off from McClellan-Palomar Airport (CLD) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from McClellan-Palomar Airport (CLD) to Heathrow Airport (LHR) last-minute?
Booking your ticket from CLD to LHR right before your getaway is typically more expensive. However, if you're flexible with your itinerary, you could grab a cheap last-minute fare.
Is it cheaper to book a CLD to LHR flight and hotel package?
Compared with arranging hotels and flights separately, booking a CLD to LHR flight and hotel package with Expedia could lead to significant savings. Better yet, having it all in one place takes the hassle out of planning your trip. Just secure your flights and select from our extensive range of hotels, then personalize your trip with extras like tours and car rentals.
Can I cancel or change the date of my flight from McClellan-Palomar Airport (CLD) to Heathrow Airport (LHR)?
If you reserved your CLD to LHR flight in the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for further details.

Explore a world of travel with Expedia

*Available to One Key members.