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Cheap flights from Portsmouth to Riverside from £431

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 29/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LAX
17 Apr — 24 Apr1
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 18 March 2026.

Wed 15/420:00
SOU
-
LAX
1 stop30h 25m
Aer Lingus
Thu 23/420:10
LAX
-
SOU
1 stop15h 20m
Aer Lingus
Deal found 15/3£619
Wed 15/409:05
SOU
-
LAX
2 stops19h 36m
KLM
Thu 23/416:45
LAX
-
SOU
1 stop32h 00m
KLM
Deal found 16/3£627
Wed 29/409:05
SOU
-
LAX
2 stops19h 43m
KLM
Wed 6/517:09
LAX
-
SOU
2 stops15h 41m
KLM
Deal found 15/3£630
Fri 1/517:20
SOU
-
LAX
1 stop33h 05m
Aer Lingus
Fri 8/520:10
LAX
-
SOU
1 stop28h 25m
Aer Lingus
Deal found 17/3£631
Wed 15/409:05
SOU
-
LAX
1 stop13h 40m
Delta
Thu 23/412:00
LAX
-
SOU
2 stops20h 50m
Delta
Deal found 16/3£639
Sun 11/1020:00
SOU
-
LAX
1 stop30h 25m
Multiple Airlines
Tue 20/1020:10
LAX
-
SOU
1 stop15h 20m
Multiple Airlines
Deal found 15/3£642

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 18 March 2026.

Round-trip from

£619

One-way from

£431

Popular in

July

Cheapest in

January

Average price

£543
Aer Lingus
  • Aer Lingus
  • 15/4-23/4
  • 2 total stops
  • 45h 45m total
  • Portsmouth to Riverside
Search Deals
29/4
  • 29/4
  • 3 total stops
  • 47h 15m total
  • Portsmouth to Riverside
Search Deals
Highest demand for flights based on searches. 31% potential increase in price (£226 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease (£34 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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 18 March 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

Fri 1/5

17:20-18:25

1 stop33h 05m

Los Angeles Los Angeles

Fri 8/5

20:10-08:35

1 stop28h 25m

£631
Fastest return journey

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 14/9

09:20-18:25

1 stop17h 05m

Los Angeles Los Angeles

Mon 5/10

20:10-19:30

1 stop15h 20m

£672

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 27/4

09:05-22:26

2 stops21h 21m

Los Angeles Los Angeles

Mon 4/5

10:35-16:50

2 stops22h 15m

£683

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Fri 1/5

17:20-15:25

2 stops30h 05m

Los Angeles Los Angeles

Fri 8/5

17:59-08:35

2 stops54h 36m

£706

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Wed 15/4

09:20-18:25

1 stop17h 05m

Los Angeles Los Angeles

Wed 6/5

20:10-19:30

1 stop15h 20m

£716

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 13/4

19:55-14:50

2 stops26h 55m

Los Angeles Los Angeles

Mon 4/5

17:05-19:25

2 stops18h 20m

£800

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Tue 14/4

08:55-18:15

2 stops17h 20m

Los Angeles Los Angeles

Tue 5/5

20:10-19:30

1 stop15h 20m

£801

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Wed 17/6

06:50-18:20

2 stops19h 30m

Los Angeles Los Angeles

Wed 8/7

17:05-19:25

2 stops18h 20m

£859

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Sun 29/3

20:45-18:15

2 stops29h 30m

Los Angeles Los Angeles

Wed 22/4

20:10-19:30

1 stop15h 20m

£869

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Wed 27/5

09:20-18:25

1 stop17h 05m

Los Angeles Los Angeles

Wed 3/6

20:10-19:30

1 stop15h 20m

£882

Flights are sorted by cheapest return flights first.

Deals found on 15/3

Showing 1-10 of 21 resultsSorted by cheapest first
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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 £240). Flying from Portsmouth to Riverside in July is currently the most expensive (average of £389). 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 18 March 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 18 March 2026.

The most flights from P0R to R1V are scheduled on a Monday (50 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (42 on average).

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 Aer Lingus, 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 £2,791, our data shows the cheapest flight currently is £372. When looking at the most popular route, (Southampton Eastleigh - Los Angeles Los Angeles), you can expect to pay £620 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 £240). Flying from Portsmouth to Riverside in July is currently the most expensive (average of £389). 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 18 March 2026.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest£240Average£511FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Norse Atlantic UKCheapest£272Average£509FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
SWISSCheapest£279Average£548FlexibilityNo cancel feeOn-time79%
Search SWISS flights
DeltaCheapest£310Average£527FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Brussels AirlinesCheapest£335Average£457FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
Aer LingusCheapest£336Average£479FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Scandinavian AirlinesCheapest£341Average£463FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Virgin AtlanticCheapest£341Average£513FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£347Average£477FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Austrian AirlinesCheapest£353Average£482FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines 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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