Find flights
When to book
FAQs

Cheap flights from Portsmouth to Riverside from £417

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 24/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LAX
3 Jun — 10 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portsmouth to Riverside

Enter your travel dates to find the best prices.

Cheapest flights from Portsmouth to Riverside
Explore the most affordable flight options available from Portsmouth to Riverside. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 May 2026.

Mon 1/609:20
SOU
-
LAX
1 stop17h 05m
Aer Lingus
Mon 8/620:10
LAX
-
SOU
1 stop15h 20m
Aer Lingus
Deal found 2/5£636
Mon 1/609:20
SOU
-
LAX
2 stops21h 50m
Multiple Airlines
Mon 8/620:10
LAX
-
SOU
1 stop15h 20m
Multiple Airlines
Deal found 3/5£694
Sun 11/1017:20
SOU
-
LAX
1 stop33h 05m
Multiple Airlines
Tue 20/1020:10
LAX
-
SOU
1 stop15h 20m
Multiple Airlines
Deal found 30/4£702
Sun 11/1017:20
SOU
-
LAX
1 stop26h 30m
KLM
Tue 20/1007:00
LAX
-
SOU
2 stops17h 35m
KLM
Deal found 30/4£713
Thu 18/609:20
SOU
-
LAX
1 stop17h 05m
Aer Lingus
Thu 25/620:10
LAX
-
SOU
1 stop15h 20m
Aer Lingus
Deal found 4/5£728

Find flight deals from Portsmouth to Riverside

Keep the following information in mind while searching for Portsmouth to Riverside flight deals. Data was last updated 4 May 2026.

Round-trip from

£636

One-way from

£417

Popular in

July

Cheapest in

January

Average price

£705
Aer Lingus
  • Aer Lingus
  • 1/6-8/6
  • 2 total stops
  • 32h 25m total
  • Portsmouth to Riverside
Search Deals
24/10
  • 24/10
  • 3 total stops
  • 43h 20m total
  • Portsmouth to Riverside
Search Deals
Highest demand for flights based on searches. 33% potential increase in price (£265 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 11% potential price decrease (£56 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portsmouth to Riverside 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 858,174 searches. Data last updated 4 May 2026.
Use the filters below to find and compare flights from Portsmouth to Riverside that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Sun 11/10

17:20-11:50

1 stop26h 30m

Los Angeles Los Angeles

Tue 20/10

07:00-08:35

2 stops17h 35m

£718

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Sun 11/10

09:15-21:17

2 stops20h 02m

Los Angeles Los Angeles

Tue 20/10

06:00-08:35

2 stops18h 35m

£752

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Tue 22/9

09:15-18:25

1 stop17h 10m

Los Angeles Los Angeles

Thu 8/10

20:10-19:30

1 stop15h 20m

£757
Fastest return journey

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Thu 29/10

09:20-19:30

1 stop17h 10m

Los Angeles Los Angeles

Thu 19/11

20:15-19:30

1 stop15h 15m

£775

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Thu 18/6

09:05-20:15

2 stops19h 10m

Los Angeles Los Angeles

Thu 25/6

16:45-08:45

1 stop32h 00m

£791

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Wed 14/10

09:20-18:25

1 stop17h 05m

Los Angeles Los Angeles

Sun 18/10

15:45-19:25

2 stops19h 40m

£803

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Sat 4/7

09:15-08:00

2 stops30h 45m

Los Angeles Los Angeles

Thu 16/7

16:45-08:45

1 stop32h 00m

£844

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Sat 4/7

09:15-08:00

2 stops30h 45m

Los Angeles Los Angeles

Tue 14/7

16:45-17:35

1 stop16h 50m

£844
Cheapest one-way

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Sat 24/10

17:20-19:10

2 stops33h 50m

£448

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 26/10

06:50-08:20

3 stops32h 30m

£452

Flights are sorted by cheapest return flights first.

Deals found on 2/5

Showing 1-10 of 17 resultsSorted by cheapest first
1
2

Best time to book a flight from Portsmouth to Riverside

Have a flexible travel schedule? Discover the best time to fly to Riverside from Portsmouth with our price prediction graph.
Estimated return 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 Portsmouth to Riverside

What is the cheapest time of day to fly from P0R to R1V?

Find hourly flight availability from Portsmouth to Riverside. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 4 May 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Portsmouth to Riverside as you normally would.

Weekly flight availability from Portsmouth to Riverside

Explore weekly flight availability from Portsmouth to Riverside. 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 4 May 2026.

The most flights from P0R to R1V are scheduled on a Sunday (55 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (54 on average).

How much does it cost for a return flight from Portsmouth to Riverside?

Related info for your journey

Find useful and relevant information for your journey from Portsmouth to Riverside. 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 Portsmouth to Riverside?

    There are many flights that can get you from Portsmouth to Riverside in 17h 10m. Fly via KLM, Delta, or British Airways to get the fastest option. The distance from Portsmouth to Riverside is about 5434 mi. This flight may include one or multiple stops.

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

    The top 3 most reliable airlines when flying from Portsmouth to Riverside are Malaysia Airlines (91%), Royal Jordanian (90%) and Fiji Airways (89%).

  • What are the cheapest flights from Portsmouth to Riverside?

    While on average a flight from Portsmouth to Riverside is generally £2,117, our data shows the cheapest flight currently is £432. When looking at the most popular route, (Southampton Eastleigh - Los Angeles Los Angeles), you can expect to pay £718 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Portsmouth to Riverside by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Portsmouth to Riverside

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to Los Angeles flights
Heathrow to San Francisco flights
Heathrow to Las Vegas flights
Gatwick to Los Angeles flights
Stansted to Los Angeles flights
London City to Los Angeles flights
Luton to Los Angeles flights
Gatwick to San Francisco flights
London City to San Francisco flights
Heathrow to Ontario flights
Stansted to San Francisco flights
Gatwick to Las Vegas flights
Heathrow to Santa Ana flights
London City to Las Vegas flights
Stansted to Las Vegas flights
Heathrow to San Diego flights
Heathrow to San Jose flights
Luton to San Francisco flights
Luton to Las Vegas flights
Manchester to Las Vegas flights
Gatwick to San Diego flights
Manchester to Los Angeles flights
Heathrow to Burbank flights
Stansted to San Diego flights
London City to San Diego flights
Manchester to San Francisco flights
London City to Santa Ana flights
Heathrow to Oakland flights
Manchester to Ontario flights
Birmingham to Los Angeles flights
Heathrow to Long Beach flights
Edinburgh to San Francisco flights
Birmingham to San Francisco flights
Gatwick to San Jose flights
Newcastle upon Tyne to Los Angeles flights
Gatwick to Santa Ana flights
Manchester to Santa Ana flights
Edinburgh to Los Angeles flights
Edinburgh to Las Vegas flights
Heathrow to Sacramento flights
Birmingham to Santa Ana flights
Gatwick to Ontario flights
Southampton to Los Angeles flights
Birmingham to Las Vegas flights
Edinburgh to San Jose flights
Leeds to Los Angeles flights
Edinburgh to Santa Ana flights
Birmingham to San Jose flights
Southend to Los Angeles flights
Manchester to San Jose flights

Top 10 airlines flying from Portsmouth to Riverside

Discover the top 10 airlines that operate flights from Portsmouth to Riverside. 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 858,174 searches. Data last updated 4 May 2026.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest£236Average£497FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Norse Atlantic UKCheapest£258Average£502FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
SWISSCheapest£288Average£543FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Scandinavian AirlinesCheapest£321Average£420FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Aer LingusCheapest£329Average£454FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Brussels AirlinesCheapest£330Average£443FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
DeltaCheapest£332Average£531FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Virgin AtlanticCheapest£335Average£466FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£340Average£480FlexibilityNo cancel feeOn-time70%
Search British Airways flights
TAP AIR PORTUGALCheapest£342Average£471FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Portsmouth to Riverside?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Portsmouth to Riverside. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Portsmouth to Riverside?

Cheapflights helps you find that perfect flight to Riverside from Portsmouth by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Portsmouth to Riverside with no change fees?

Yes, we can. To see specific flights from Portsmouth to Riverside with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Portsmouth to Riverside become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Riverside from Portsmouth today and book when prices fit your budget.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.