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$178+ Cheap flights from Pasadena, CA to Heathrow (LHR)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/12. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — LHR
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
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Cheapflights Tip: The best prices from Pasadena to London Heathrow are usually found in October or September, booked 44 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

Cheap flight deals from Pasadena to Heathrow

Keep the following information in mind while searching for Pasadena to Heathrow flight deals. Data was last updated July 30, 2025.

Round-trip from

$510
(Ovago)

One-way from

$178
(TAP AIR PORTUGAL)

Popular in

December

Cheapest in

October

Average price

$884
From Pasadena to London Heathrow
Search Deals
One-way flight from Pasadena to London Heathrow
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Highest demand for flights based on searches. 7% potential increase in price ($61 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Pasadena to Heathrow

Cheapest flights from Pasadena to Heathrow
Explore the most affordable flight options available from Pasadena to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

This Iberia deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/25:00 amLAX - LHR
1 stop16h 50mIberia
Tue 11/116:45 pmLHR - LAX
1 stop29h 50mIberia
Deal found 7/29$510
This British Airways deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/153:40 pmLAX - LHR
Nonstop10h 25mBritish Airways
Wed 10/2210:10 amLHR - LAX
Nonstop11h 15mBritish Airways
Deal found 7/30$511
This LATAM Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/202:53 pmLAX - LHR
1 stop15h 32mMultiple Airlines
Fri 9/52:20 pmLHR - LAX
Nonstop11h 15mMultiple Airlines
Deal found 7/30$514
This SWISS deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/87:35 pmLAX - LHR
1 stop18h 10mSWISS
Wed 9/248:40 amLHR - LAX
1 stop15h 50mSWISS
Deal found 7/28$519
This Mytrip deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/128:15 pmLAX - LHR
1 stop15h 10mAer Lingus
Fri 9/199:50 amLHR - LAX
1 stop16h 35mAer Lingus
Deal found 7/29$521
This United Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2512:56 amLAX - LHR
1 stop22h 44mUnited Airlines
Tue 9/21:05 pmLHR - LAX
Nonstop11h 10mUnited Airlines
Deal found 7/28$522
This lol.travel deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/79:35 pmLAX - LHR
Nonstop10h 30mFinnair
Mon 9/227:30 amLHR - LAX
1 stop17h 35mFinnair
Deal found 7/30$523
This Delta deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/106:40 amLAX - LHR
1 stop16h 05mDelta
Thu 9/186:30 amLHR - LAX
2 stops23h 24mDelta
Deal found 7/30$524
This Kiwi.com deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/75:30 pmLAX - LHR
1 stop15h 35mLufthansa
Mon 9/228:25 pmLHR - LAX
2 stops24h 35mLufthansa
Deal found 7/28$536
This American Airlines deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/711:40 amLAX - LHR
1 stop13h 30mAmerican Airlines
Mon 9/2210:20 amLHR - LAX
1 stop14h 45mAmerican Airlines
Deal found 7/29$540
This Austrian Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/157:30 amLAX - LHR
2 stops18h 05mAustrian Airlines
Wed 9/246:00 amLHR - LAX
1 stop15h 05mAustrian Airlines
Deal found 7/28$548

Cheapflights Fare Finder

 
Customize your flight search to find flights from Pasadena 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 2,558,603 searches. Data last updated July 30, 2025.
Use the filters below to find and compare flights from Pasadena to London Heathrow Airport that are best for you.

Fly from

Pasadena

Fly to

Heathrow

Route

Depart

Return

Price

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Tue 8/12

1:30 pm-8:00 am

Nonstop10h 30m

London Heathrow

Tue 8/26

11:40 am-2:55 pm

Nonstop11h 15m

$510

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Wed 9/10

3:05 pm-2:20 pm

1 stop15h 15m

London Heathrow

Thu 9/18

6:00 am-1:05 pm

1 stop15h 05m

$512

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Wed 8/20

2:15 pm-1:30 pm

1 stop15h 15m

London Heathrow

Wed 8/27

6:15 am-1:05 pm

1 stop14h 50m

$514

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Mon 8/18

1:48 pm-10:50 am

1 stop13h 02m

London Heathrow

Wed 9/3

12:00 pm-7:42 pm

1 stop15h 42m

$518

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Mon 9/8

7:35 pm-9:45 pm

1 stop18h 10m

London Heathrow

Thu 9/25

8:40 am-4:30 pm

1 stop15h 50m

$519

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Fri 9/12

8:15 pm-7:25 pm

1 stop15h 10m

London Heathrow

Fri 9/19

9:50 am-6:25 pm

1 stop16h 35m

$521

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Mon 8/25

12:56 am-7:40 am

1 stop22h 44m

London Heathrow

Tue 9/2

1:05 pm-4:15 pm

Nonstop11h 10m

$522

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Sun 9/7

9:35 pm-4:05 pm

Nonstop10h 30m

London Heathrow

Mon 9/22

7:30 am-5:05 pm

1 stop17h 35m

$523

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Sun 9/7

5:30 pm-5:05 pm

1 stop15h 35m

London Heathrow

Mon 9/22

8:25 pm-1:00 pm

2 stops24h 35m

$536

Los AngelesLondon

LAX - LHR

LAXLHR

Los Angeles

Sun 9/7

11:40 am-9:10 am

1 stop13h 30m

London Heathrow

Mon 9/22

10:20 am-5:05 pm

1 stop14h 45m

$540

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 13 results
1
2

Best time to book a flight from Pasadena to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Pasadena with our price prediction graph.
Estimated round-trip 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 Pasadena to London Heathrow Airport

How far ahead should I book a flight from Pasadena to London Heathrow Airport?

Use this chart to determine the optimal time to book a round-trip flight from Pasadena to Heathrow. Price data was last updated on July 25, 2025.

To ensure you get the cheapest price possible for a flight from Pasadena to London Heathrow Airport, you should look to book at least 44 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Pasadena to London Heathrow Airport?

Currently, November is the cheapest month in which you can book a flight from Pasadena to London Heathrow Airport (average of $661). Flying from Pasadena to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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.

What is the cheapest time of day to fly from P4S to LHR?

Find hourly flight availability from Pasadena to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 30, 2025.

When flying from Pasadena to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What is the cheapest day to fly from Pasadena to London Heathrow Airport?

Use this chart to determine the cheapest time to fly round-trip from Pasadena to Heathrow. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Pasadena to London Heathrow Airport flight should consider departing on Sunday mornings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Pasadena to London Heathrow Airport

Explore weekly flight availability from Pasadena to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 30, 2025.

The most flights from P4S to LHR are scheduled on a Monday (59 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (44 on average).

How much does it cost to fly round-trip from Pasadena to London Heathrow Airport?

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated July 30, 2025.
Get a feel of what it's like to fly with Delta, Austrian Airlines, and Finnair from Pasadena to London Heathrow Airport by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,980 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Austrian Airlines
7.6
Good
823 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Finnair
7.6
Good
1,316 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
SWISS
7.5
Good
1,686 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,896 reviews
Delta
8.0
Very good
7,980 reviews

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.3

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

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

  • What are the most reliable airlines from Pasadena to London Heathrow Airport?

    No one likes to see their flight delayed. When booking a flight from Pasadena to London Heathrow Airport consider choosing KLM (89%), Air France (89%) or Delta (89%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Pasadena to London Heathrow Airport?

    On average you can expect to pay $3,320 for a flight from Pasadena to London Heathrow Airport. The cheapest flight overall is $377 while the most popular route, (Los Angeles - London Heathrow) is currently priced at $427.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Pasadena 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 Pasadena to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from Pasadena to London Heathrow Airport (average of $661). Flying from Pasadena to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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

Traveling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Hayes
Thornton Heath
Harrow
Canterbury
Dover
Stratford-upon-Avon
Orpington
Watford
Northampton
Gatwick
Borehamwood
Dartford
Broadway
Aylesbury
Chelmsford
Folkestone
Southend-on-Sea
Chichester
Swindon

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Pasadena to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from Pasadena to Heathrow

Discover the top 10 airlines that operate flights from Pasadena to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$272Average$1,046FlexibilityNo cancel feeOn-time60%
JetBlueCheapest$273Average$791FlexibilityNo cancel feeOn-time62%
SWISSCheapest$336Average$706FlexibilityNo cancel feeOn-time79%
TAP AIR PORTUGALCheapest$375Average$673FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$418Average$592FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$427Average$732FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$476Average$703FlexibilityNo cancel feeOn-timeN/A
Norse Atlantic UKCheapest$477Average$743FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$540Average$720FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$553Average$826FlexibilityNo cancel feeOn-time70%

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