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Portsmouth

$489+ Cheap flights from Irvine, CA to Portsmouth, England

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 1/19. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — LHR
Nov 30 — Dec 71
Sun 11/30
Sun 12/7
1 adult, Economy
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Find flight deals from Irvine to Portsmouth

Cheapest flights from Irvine to Portsmouth
Explore the most affordable flight options available from Irvine to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 31, 2025.

This Delta deal was found by Cheapflights users on 10/30. 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.
Thu 11/271:45 pmLAX - SOU
1 stop19h 15mDelta
Sat 12/65:30 pmSOU - LAX
1 stop26h 15mDelta
Deal found 10/30$741
This Delta deal was found by Cheapflights users on 10/30. 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.
Thu 11/2711:55 amLAX - SOU
2 stops21h 05mDelta
Sun 12/79:30 amSOU - LAX
1 stop34h 15mDelta
Deal found 10/30$745
This Delta deal was found by Cheapflights users on 10/30. 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.
Thu 11/271:45 pmLAX - SOU
1 stop19h 15mDelta
Mon 12/86:05 pmSOU - LAX
2 stops29h 55mDelta
Deal found 10/30$751
This Delta deal was found by Cheapflights users on 10/30. 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 11/261:45 pmLAX - SOU
1 stop19h 40mDelta
Thu 12/46:05 pmSOU - LAX
1 stop25h 40mDelta
Deal found 10/30$790
This Delta deal was found by Cheapflights users on 10/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/21:45 pmLAX - SOU
1 stop19h 15mDelta
Wed 12/245:30 pmSOU - LAX
2 stops31h 05mDelta
Deal found 10/29$800
This Delta deal was found by Cheapflights users on 10/30. 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.
Tue 11/251:45 pmLAX - SOU
1 stop19h 15mDelta
Fri 12/55:30 pmSOU - LAX
1 stop26h 15mDelta
Deal found 10/30$840
This KLM deal was found by Cheapflights users on 10/29. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/71:45 pmLAX - SOU
1 stop19h 40mKLM
Sun 12/146:05 pmSOU - LAX
1 stop25h 40mKLM
Deal found 10/29$842
This KAYAK deal was found by Cheapflights users on 10/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/298:15 pmLAX - SOU
1 stop35h 20mAer Lingus
Sun 12/79:30 amSOU - LAX
1 stop17h 00mAer Lingus
Deal found 10/29$1,050
This KAYAK deal was found by Cheapflights users on 10/30. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/53:55 pmLAX - SOU
1 stop19h 45mAer Lingus
Tue 11/118:10 pmSOU - LAX
1 stop30h 20mAer Lingus
Deal found 10/30$1,068

Cheap flight deals from Irvine to Portsmouth

Keep the following information in mind while searching for Irvine to Portsmouth flight deals. Data was last updated October 31, 2025.

Most accurate provider

Gotogate
3 stars

Most trusted provider

Gotogate
3 stars

Round-trip from

$741
(Delta)

One-way from

$489
(Delta)

Popular in

January

Cheapest in

April

Average price

$1,108
Provider with most accurate pricing for Los Angeles-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-London (LON) flights.
Search Deals
From Irvine to Portsmouth
Search Deals
One-way flight from Irvine to Portsmouth
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($291 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease ($101 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Irvine to Portsmouth 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 October 31, 2025.
Use the filters below to find and compare flights from Irvine to Portsmouth that are best for you.

Fly from

Irvine

Fly to

Portsmouth

Route

Depart

Return

Price

Los AngelesSouthampton

LAX - SOU

LAXSOU

Los Angeles

Fri 11/28

1:40 pm-5:00 pm

1 stop19h 20m

Southampton Eastleigh

Wed 12/3

8:40 am-11:45 am

1 stop35h 05m

$741

Los AngelesSouthampton

LAX - SOU

LAXSOU

Los Angeles

Fri 11/28

1:40 pm-5:00 pm

1 stop19h 20m

Southampton Eastleigh

Tue 12/2

5:30 pm-11:45 am

1 stop26h 15m

$741

Los AngelesSouthampton

LAX - SOU

LAXSOU

Los Angeles

Sun 11/30

1:45 pm-5:25 pm

1 stop19h 40m

Southampton Eastleigh

Sun 12/7

6:05 pm-11:45 am

1 stop25h 40m

$741

Los AngelesSouthampton

LAX - SOU

LAXSOU

Los Angeles

Sat 11/29

1:45 pm-8:10 am

1 stop34h 25m

Southampton Eastleigh

Mon 12/8

6:05 pm-11:45 am

1 stop25h 40m

$741

Los AngelesSouthampton

LAX - SOU

LAXSOU

Los Angeles

Fri 11/28

8:36 am-8:50 am

2 stops16h 14m

Southampton Eastleigh

Sat 12/6

9:25 am-11:45 am

1 stop34h 20m

$745

Los AngelesSouthampton

LAX - SOU

LAXSOU

Los Angeles

Thu 11/27

11:55 am-5:00 pm

2 stops21h 05m

Southampton Eastleigh

Sun 12/7

9:30 am-11:45 am

1 stop34h 15m

$745

Los AngelesSouthampton

LAX - SOU

LAXSOU

Los Angeles

Thu 11/27

7:15 am-8:05 am

2 stops16h 50m

Southampton Eastleigh

Thu 12/4

6:05 pm-11:45 am

1 stop25h 40m

$745

Los AngelesSouthampton

LAX - SOU

LAXSOU

Los Angeles

Thu 11/27

5:45 am-5:00 pm

2 stops27h 15m

Southampton Eastleigh

Sat 12/6

9:25 am-11:45 am

1 stop34h 20m

$745

Los AngelesSouthampton

LAX - SOU

LAXSOU

Los Angeles

Thu 11/27

2:00 pm-5:00 pm

2 stops19h 00m

Southampton Eastleigh

Fri 12/5

8:40 am-11:45 am

1 stop35h 05m

$745

Los AngelesSouthampton

LAX - SOU

LAXSOU

Los Angeles

Thu 11/27

1:45 pm-5:00 pm

1 stop19h 15m

Southampton Eastleigh

Mon 12/8

6:05 pm-4:00 pm

2 stops29h 55m

$751

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 20 results
1
2

Best time to book a flight from Irvine to Portsmouth

Have a flexible travel schedule? Discover the best time to fly to Portsmouth from Irvine 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 Irvine to Portsmouth

What is the cheapest month to book a flight from Irvine to Portsmouth?

Currently, October is the cheapest month in which you can book a flight from Irvine to Portsmouth (average of $251). Flying from Irvine to Portsmouth in June is currently the most expensive (average of $564). 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 IR9 to P0R?

Find hourly flight availability from Irvine to Portsmouth. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 31, 2025.

A simple way to save on the total cost of your ticket is to fly from Irvine to Portsmouth in the afternoon. If you’re flexible enough to do this you can expect to save up to 19% on your trip compared to booking a flight at noon.

What is the cheapest day to fly from Irvine to Portsmouth?

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

Travelers seeking maximum savings on their Irvine to Portsmouth flight should consider departing on Friday evenings 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.

Reviews of airlines servicing Portsmouth

Get insights into the airlines that provide service to Portsmouth. 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 Portsmouth. Reviews last updated October 31, 2025.
Read through reviews of airlines operating flights from Irvine to Portsmouth, such as Delta, KLM, and Virgin Atlantic. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
7,993 reviews

Overall

7.9

Entertainment

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

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
7.9
Good
7,993 reviews
Delta
7.9
Good
7,993 reviews

Overall

7.9

Entertainment

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

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.
KLM
7.7
Good
1,406 reviews
Delta
7.9
Good
7,993 reviews

Overall

7.9

Entertainment

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

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.
Virgin Atlantic
7.5
Good
670 reviews
Delta
7.9
Good
7,993 reviews

Overall

7.9

Entertainment

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

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.
Aer Lingus
7.2
Good
1,361 reviews
Delta
7.9
Good
7,993 reviews

Overall

7.9

Entertainment

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Comfort

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 Irvine to Portsmouth. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Irvine to Portsmouth?

    Airlines like Delta fly from Irvine to Portsmouth in about 19h 20m. The time it takes to get you to your destination can typically vary by up to . Irvine and Portsmouth are separated by a distance of 5434 mi.

  • What are the most reliable airlines from Irvine to Portsmouth?

    Before booking your flight to Portsmouth from Irvine, check out the most reliable airlines to get you to your destination on time: KLM (95%), Air France (95%), Delta( 95%).

  • What are the cheapest flights from Irvine to Portsmouth?

    While on average a flight from Irvine to Portsmouth is generally $3,109, our data shows the cheapest flight currently is $329. When looking at the most popular route, (Los Angeles - Southampton Eastleigh), you can expect to pay $799 for that flight.

  • Can I find deals for flights from Irvine to Portsmouth that include hotel bookings?

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

  • How can I find direct flights from Irvine to Portsmouth?

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

  • Can I find deals for business class flights from Irvine to Portsmouth?

    Yes. Cheapflights offers flight deals from Irvine to Portsmouth 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 Irvine to Portsmouth?

    Currently, October is the cheapest month in which you can book a flight from Irvine to Portsmouth (average of $251). Flying from Irvine to Portsmouth in June is currently the most expensive (average of $564). 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.

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Top 10 airlines flying from Irvine to Portsmouth

Discover the top 10 airlines that operate flights from Irvine to Portsmouth. 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 October 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$272Average$1,046FlexibilityNo cancel feeOn-time60%
JetBlueCheapest$273Average$810FlexibilityNo cancel feeOn-time62%
SWISSCheapest$336Average$922FlexibilityNo cancel feeOn-time79%
Norse Atlantic UKCheapest$359Average$680FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$397Average$893FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$419Average$594FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$427Average$628FlexibilityNo cancel feeOn-timeN/A
Aer LingusCheapest$476Average$888FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$487Average$703FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$498Average$870FlexibilityNo cancel feeOn-time70%

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