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Cheap flights from Portsmouth to Riverside from £482

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/11. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LAX
1 May — 8 May1
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 1 April 2026.

Mon 9/1119:55
SOU
-
LAX
1 stop30h 15m
Multiple Airlines
Sun 15/1119:55
LAX
-
SOU
1 stop15h 25m
Multiple Airlines
Deal found 29/3£482
Fri 15/509:20
SOU
-
LAX
1 stop17h 05m
Aer Lingus
Fri 22/520:10
LAX
-
SOU
1 stop15h 20m
Aer Lingus
Deal found 31/3£614
Tue 12/509:20
SOU
-
LAX
1 stop17h 05m
Aer Lingus
Tue 19/520:10
LAX
-
SOU
1 stop15h 20m
Aer Lingus
Deal found 28/3£615
Mon 9/1108:40
SOU
-
LAX
1 stop35h 05m
KLM
Sun 15/1106:00
LAX
-
SOU
2 stops18h 10m
KLM
Deal found 29/3£649
Sat 14/1109:25
SOU
-
LAX
2 stops19h 57m
KLM
Tue 17/1107:00
LAX
-
SOU
2 stops17h 10m
KLM
Deal found 31/3£655
Tue 12/517:20
SOU
-
LAX
1 stop26h 30m
Virgin Atlantic
Tue 19/516:45
LAX
-
SOU
1 stop31h 50m
Virgin Atlantic
Deal found 29/3£657
Tue 12/509:05
SOU
-
LAX
1 stop13h 40m
Delta
Tue 19/509:25
LAX
-
SOU
2 stops23h 25m
Delta
Deal found 28/3£665
Mon 28/909:20
SOU
-
LAX
1 stop17h 05m
British Airways
Mon 19/1020:10
LAX
-
SOU
1 stop15h 20m
British Airways
Deal found 30/3£685
Wed 29/409:20
SOU
-
LAX
1 stop17h 05m
British Airways
Wed 20/520:10
LAX
-
SOU
1 stop15h 20m
British Airways
Deal found 1/4£688
Sun 26/409:15
SOU
-
LAX
1 stop34h 35m
Delta
Tue 12/515:26
LAX
-
SOU
2 stops17h 24m
Delta
Deal found 1/4£689

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 1 April 2026.

Round-trip from

£614

One-way from

£509

Popular in

July

Cheapest in

January

Average price

£681
Aer Lingus
  • Aer Lingus
  • 15/5-22/5
  • 2 total stops
  • 32h 25m total
  • Portsmouth to Riverside
Search Deals
Aer Lingus
  • Aer Lingus
  • 12/4
  • 1 total stop
  • 30h 25m total
  • Portsmouth to Riverside
Search Deals
Highest demand for flights based on searches. 31% potential increase in price (£229 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease (£35 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 1 April 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

Mon 28/9

09:20-18:25

1 stop17h 05m

Los Angeles

Mon 19/10

17:05-19:25

2 stops18h 20m

£693

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Tue 12/5

09:05-20:45

2 stops19h 40m

Los Angeles

Tue 19/5

09:25-16:50

2 stops23h 25m

£702

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Thu 14/5

09:05-22:44

2 stops21h 39m

Los Angeles

Thu 21/5

09:25-16:50

2 stops23h 25m

£732

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 27/4

19:55-13:40

2 stops25h 45m

Los Angeles

Mon 18/5

20:10-19:30

1 stop15h 20m

£737
Fastest return journey

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Thu 10/9

09:20-18:25

1 stop17h 05m

Los Angeles

Sun 13/9

20:10-19:30

1 stop15h 20m

£737

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Sat 26/9

09:20-18:25

1 stop17h 05m

Los Angeles

Sat 17/10

20:10-19:30

1 stop15h 20m

£764

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Fri 14/8

06:50-18:20

2 stops19h 30m

Los Angeles

Tue 25/8

18:10-08:25

2 stops30h 15m

£782

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Sun 19/4

20:45-13:40

2 stops24h 55m

Los Angeles

Sun 26/4

20:10-19:30

1 stop15h 20m

£812

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Tue 30/6

09:15-18:25

1 stop17h 10m

Los Angeles

Tue 21/7

17:05-19:30

2 stops18h 25m

£821
Cheapest one-way
Fastest single journey

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 13/7

09:20-18:25

1 stop17h 05m

£580

Flights are sorted by cheapest return flights first.

Deals found on 1/4

Showing 1-10 of 18 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 month to book a flight from Portsmouth to Riverside?

Currently, September is the cheapest month in which you can book a flight from Portsmouth to Riverside (average of £242). Flying from Portsmouth to Riverside in July is currently the most expensive (average of £393). 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 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 1 April 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 1 April 2026.

The most flights from P0R to R1V are scheduled on a Monday (50 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (50 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 05m. Fly via British Airways or Delta 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 SriLankan Airlines (97%), Fiji Airways (90%) and Malaysia Airlines (90%).

  • What are the cheapest flights from Portsmouth to Riverside?

    While on average a flight from Portsmouth to Riverside is generally £2,798, our data shows the cheapest flight currently is £382. When looking at the most popular route, (Southampton Eastleigh - Los Angeles), you can expect to pay £614 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.

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

    Currently, September is the cheapest month in which you can book a flight from Portsmouth to Riverside (average of £242). Flying from Portsmouth to Riverside in July is currently the most expensive (average of £393). 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

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Alternative routes for Portsmouth to Riverside

See prices for flight routes from nearby airports that may be better suited for you.
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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 1 April 2026.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest£242Average£509FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Norse Atlantic UKCheapest£274Average£501FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
SWISSCheapest£282Average£561FlexibilityNo cancel feeOn-time79%
Search SWISS flights
DeltaCheapest£313Average£528FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Aer LingusCheapest£339Average£471FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Brussels AirlinesCheapest£339Average£462FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
Scandinavian AirlinesCheapest£342Average£464FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Virgin AtlanticCheapest£344Average£517FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£350Average£481FlexibilityNo cancel feeOn-time70%
Search British Airways flights
TAP AIR PORTUGALCheapest£351Average£483FlexibilityNo 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.

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