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Cheap flights from Portsmouth to Riverside from £415

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 21/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LAX
6 Apr — 13 Apr1
1 adult

Cheap 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 2025.

Round-trip from

£531

One-way from

£415

Popular in

August

Cheapest in

January

Average price

£614
Delta
  • Delta
  • 1/9-17/9
  • 2 total stops
  • 29h 40m total
  • Portsmouth to Riverside
Aer Lingus
  • Aer Lingus
  • 21/9
  • 1 total stop
  • 30h 25m total
  • Portsmouth to Riverside
Highest demand for flights based on searches. 16% potential increase in price (£105 potential increase over avg. return price).
Cheapest flight prices on average. 3% potential price decrease (£19 potential savings vs. average return price).
Average for round-trip flights in April 2025

Find flight deals from Portsmouth to Riverside

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 2025.

Mon 1/909:20SOU - LAX
1 stop13h 30mDelta
Fri 19/916:50LAX - SOU
1 stop16h 10mDelta
Deal found 31/3£531
Fri 22/809:20SOU - LAX
1 stop13h 30mKLM
Fri 5/913:50LAX - SOU
1 stop19h 10mKLM
Deal found 31/3£707
Mon 5/508:05SOU - LAX
1 stop19h 00mMultiple Airlines
Sat 10/516:45LAX - SOU
1 stop17h 05mMultiple Airlines
Deal found 31/3£724
Wed 2/709:10SOU - LAX
1 stop17h 15mAer Lingus
Sat 2/820:05LAX - SOU
2 stops29h 05mAer Lingus
Deal found 31/3£817

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 2025.
Use the filters below to find and compare flights from Portsmouth to Riverside that are best for you.

Fly from

Portsmouth

Fly to

Riverside

Route

Depart

Return

Price

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 1/9

09:20-14:50

1 stop13h 30m

Los Angeles

Fri 19/9

16:50-17:00

1 stop16h 10m

£531

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Fri 22/8

09:20-14:50

1 stop13h 30m

Los Angeles

Fri 5/9

13:50-17:00

1 stop19h 10m

£707

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 5/5

08:05-19:05

1 stop19h 00m

Los Angeles

Sat 10/5

16:45-17:50

1 stop17h 05m

£724

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Wed 2/7

09:10-18:25

1 stop17h 15m

Los Angeles

Sat 2/8

20:05-09:10

2 stops29h 05m

£817

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Sun 21/9

20:00-18:25

1 stop30h 25m

£415

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 28/7

20:00-22:10

2 stops34h 10m

£503

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 1/9

17:35-11:50

1 stop26h 15m

£1,123

Flights are sorted by cheapest return flights first.

Deals found on 31/3

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, January is the cheapest month in which you can book a flight from Portsmouth to Riverside (average of £575). Flying from Portsmouth to Riverside in July is currently the most expensive (average of £811). 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 2025.

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.

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

Use this chart to determine the cheapest time to fly return from Portsmouth to Riverside. Price data was last updated on 29 September 2024.

Travellers seeking maximum savings on their Portsmouth to Riverside flight should consider departing on Tuesday mornings when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 2025.

The most flights from P0R to R1V are scheduled on a Saturday (55 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (49 on average).

Rainfall in Riverside by month

Plan your trip to Riverside by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Riverside ranges from 0.0 - 87.0 inches per month. February is typically the wettest month, when rainfall can reach 87.0 mm. July is typically the driest time to visit Riverside when rainfall is around 0.0 mm.

Temperature in Riverside by month

Plan your trip to Riverside by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Riverside, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 14.0 C).

Reviews of airlines servicing Riverside

Get insights into the airlines that provide service to Riverside. 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 Riverside. Reviews last updated 1 April 2025.
See what other customers who have flown with Delta, KLM and Aer Lingus from Portsmouth to Riverside have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
8.0
Very Good

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.
  • 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 (96%), Fiji Airways (92%) and Malaysia Airlines (92%).

  • What are the cheapest flights from Portsmouth to Riverside?

    While on average a flight from Portsmouth to Riverside is generally £1,976, our data shows the cheapest flight currently is £385. When looking at the most popular route, (Southampton Eastleigh - Los Angeles), you can expect to pay £506 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, January is the cheapest month in which you can book a flight from Portsmouth to Riverside (average of £575). Flying from Portsmouth to Riverside in July is currently the most expensive (average of £811). 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.

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 2025.
AirlineCheapestAverageFlexibilityOn-time
Norse Atlantic UKCheapest£303Average£541FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
DeltaCheapest£340Average£578FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
KLMCheapest£359Average£556FlexibilityNo cancel feeOn-time75%
Search KLM flights
Austrian AirlinesCheapest£369Average£523FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
Scandinavian AirlinesCheapest£372Average£498FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Air FranceCheapest£373Average£483FlexibilityNo cancel feeOn-time77%
Search Air France flights
SWISSCheapest£374Average£544FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Air CanadaCheapest£381Average£498FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Brussels AirlinesCheapest£385Average£563FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
United AirlinesCheapest£391Average£585FlexibilityNo cancel feeOn-time69%
Search United 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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