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 to get the fastest option. The distance from Portsmouth to Riverside is about 5434 mi.

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.

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).

What are the cheapest flights from Portsmouth to Riverside?

While on average a flight from Portsmouth to Riverside is generally £2,273, our data shows the cheapest flight currently is £319. When looking at the most popular route, (Southampton Eastleigh - Los Angeles Los Angeles), you can expect to pay £492 for that flight.

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 (92%), Malaysia Airlines (92%) and Fiji Airways (88%).

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.

£437+ Cheap Flights from Portsmouth to Riverside

Cheap flight deals from Portsmouth to Riverside

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

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 31 August 2026.

Mon 28/909:20 -

1 stop17h 05m

Mon 19/1020:10 -

1 stop15h 20m

Deal found 31/8£485

Thu 15/1009:20 -

1 stop17h 05m

Thu 22/1020:10 -

1 stop15h 20m

Deal found 31/8£487

Mon 28/909:20 -

1 stop17h 05m

Tue 6/1020:10 -

1 stop15h 20m

Deal found 26/8£488

Wed 16/1209:20 -

1 stop17h 20m

Fri 8/120:25 -

1 stop28h 15m

Deal found 31/8£490

Thu 8/1009:20 -

1 stop17h 05m

Fri 16/1020:10 -

1 stop28h 25m

Deal found 28/8£492

Sun 11/1020:00 -

1 stop30h 25m

Tue 20/1020:10 -

1 stop15h 20m

Deal found 31/8£494

Thu 24/917:20 -

1 stop33h 05m

Thu 15/1020:10 -

1 stop15h 20m

Deal found 27/8£496

Tue 15/917:20 -

1 stop33h 05m

Fri 25/920:10 -

1 stop28h 25m

Deal found 29/8£505

Fri 18/920:00 -

1 stop30h 25m

Sat 26/920:10 -

1 stop28h 30m

Deal found 26/8£507

Sun 13/1209:20 -

1 stop17h 20m

Sun 10/120:25 -

1 stop15h 05m

Deal found 31/8£513

Mon 12/1009:20 -

1 stop17h 05m

Sun 22/1120:25 -

1 stop15h 05m

Deal found 29/8£515

Find flight deals from Portsmouth to Riverside

Round-trip from	£485
One-way from	£437
Popular in	December
Cheapest in	February
Average price	£529

British Airways
28/9-19/10
2 total stops
32h 25m total
Portsmouth to Riverside

Search Deals

British Airways
19/10
1 total stop
17h 05m total
Portsmouth to Riverside

Search Deals

Highest demand for flights based on searches. 1% potential increase in price (£6 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (£5 potential savings vs. average return price).

Search Deals

Average for round-trip flights in August 2026

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Cheapflights Fare Finder

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

Fastest return journey

SouthamptonLos Angeles

SOU Southampton Eastleigh - LAX Los Angeles Los Angeles

SOULAX

Southampton Eastleigh

Mon 28/9

09:20-18:25

1 stop17h 05m

Los Angeles Los Angeles

Mon 19/10

20:10-19:30

1 stop15h 20m

£485

SouthamptonLos Angeles

SOU Southampton Eastleigh - LAX Los Angeles Los Angeles

SOULAX

Southampton Eastleigh

Mon 28/9

09:20-18:25

1 stop17h 05m

Los Angeles Los Angeles

Tue 6/10

20:10-19:30

1 stop15h 20m

£488

SouthamptonLos Angeles

SOU Southampton Eastleigh - LAX Los Angeles Los Angeles

SOULAX

Southampton Eastleigh

Sun 11/10

20:00-18:25

1 stop30h 25m

Los Angeles Los Angeles

Tue 20/10

20:10-19:30

1 stop15h 20m

£494

SouthamptonLos Angeles

SOU Southampton Eastleigh - LAX Los Angeles Los Angeles

SOULAX

Southampton Eastleigh

Thu 24/9

17:20-18:25

1 stop33h 05m

Los Angeles Los Angeles

Thu 15/10

20:10-19:30

1 stop15h 20m

£496

SouthamptonLos Angeles

SOU Southampton Eastleigh - LAX Los Angeles Los Angeles

SOULAX

Southampton Eastleigh

Fri 18/9

20:00-18:25

1 stop30h 25m

Los Angeles Los Angeles

Sat 26/9

20:10-08:40

1 stop28h 30m

£507

SouthamptonLos Angeles

SOU Southampton Eastleigh - LAX Los Angeles Los Angeles

SOULAX

Southampton Eastleigh

Thu 28/1

09:20-18:40

1 stop17h 20m

Los Angeles Los Angeles

Mon 1/2

20:25-08:40

1 stop28h 15m

£521

SouthamptonLos Angeles

SOU Southampton Eastleigh - LAX Los Angeles Los Angeles

SOULAX

Southampton Eastleigh

Wed 16/12

09:20-18:40

1 stop17h 20m

Los Angeles Los Angeles

Mon 11/1

18:25-19:00

2 stops16h 35m

£539

SouthamptonLos Angeles

SOU Southampton Eastleigh - LAX Los Angeles Los Angeles

SOULAX

Southampton Eastleigh

Wed 16/12

09:20-18:40

1 stop17h 20m

Los Angeles Los Angeles

Sat 9/1

18:00-19:00

2 stops17h 00m

£539

SouthamptonLos Angeles

SOU Southampton Eastleigh - LAX Los Angeles Los Angeles

SOULAX

Southampton Eastleigh

Wed 16/12

09:20-18:40

1 stop17h 20m

Los Angeles Los Angeles

Wed 6/1

18:00-19:00

2 stops17h 00m

£539

SouthamptonLos Angeles

SOU Southampton Eastleigh - LAX Los Angeles Los Angeles

SOULAX

Southampton Eastleigh

Mon 12/10

09:20-18:25

1 stop17h 05m

Los Angeles Los Angeles

Mon 23/11

15:30-19:00

2 stops19h 30m

£541

Flights are sorted by cheapest return flights first.

Deals found on 31/8

Showing 1-10 of 21 resultsSorted by cheapest first

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.

SOU-LAX

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

P0R-R1V

SOU-LAX

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

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

The most flights from P0R to R1V are scheduled on a Sunday (58 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (48 on average).

Related info for your journey

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 to get the fastest option. The distance from Portsmouth to Riverside is about 5434 mi.
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 (92%), Malaysia Airlines (92%) and Fiji Airways (88%).
What are the cheapest flights from Portsmouth to Riverside?
While on average a flight from Portsmouth to Riverside is generally £2,273, our data shows the cheapest flight currently is £319. When looking at the most popular route, (Southampton Eastleigh - Los Angeles Los Angeles), you can expect to pay £492 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.

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Top 10 airlines flying from Portsmouth to Riverside

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest£301	Average£523	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Norse Atlantic UK	Cheapest£325	Average£517	FlexibilityNo cancel fee	On-timeN/A	Search Norse Atlantic UK flights
Aer Lingus	Cheapest£331	Average£474	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Virgin Atlantic	Cheapest£336	Average£467	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Delta	Cheapest£337	Average£587	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Brussels Airlines	Cheapest£343	Average£476	FlexibilityNo cancel fee	On-timeN/A	Search Brussels Airlines flights
TAP AIR PORTUGAL	Cheapest£343	Average£468	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
SWISS	Cheapest£344	Average£532	FlexibilityNo cancel fee	On-time79%	Search SWISS flights
Austrian Airlines	Cheapest£355	Average£485	FlexibilityNo cancel fee	On-time78%	Search Austrian Airlines flights
British Airways	Cheapest£359	Average£513	FlexibilityNo cancel fee	On-time70%	Search British Airways flights

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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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Cheap flights from Portsmouth to Riverside from £437

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 19/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Portsmouth to Riverside

Cheapest flights from Portsmouth to RiversideExplore 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 31 August 2026.

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 31 August 2026.

Best flights from Portsmouth to RiversideDiscover carefully curated flight deals from Portsmouth to Riverside that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 31 August 2026.

Discover carefully curated flight deals from Portsmouth to Riverside that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 31 August 2026.

Last-minute flights from Portsmouth to RiversideDiscover last-minute flight deals from Portsmouth to Riverside. Data last updated 31 August 2026 and is based on user searches.

Discover last-minute flight deals from Portsmouth to Riverside. Data last updated 31 August 2026 and is based on user searches.

One-way flights from Portsmouth to RiversideSearch for one-way flight options from Portsmouth to Riverside. Find affordable one-way fares based on user searches. Data last updated 31 August 2026.

Search for one-way flight options from Portsmouth to Riverside. Find affordable one-way fares based on user searches. Data last updated 31 August 2026.

Find flight deals from Portsmouth to Riverside

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

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.

Cheapflights Insights

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 31 August 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 31 August 2026.

The most flights from P0R to R1V are scheduled on a Sunday (58 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (48 on average).

Related info for your journey

How long is the flight from Portsmouth to Riverside?

What are the most reliable airlines from Portsmouth to Riverside?

What are the cheapest flights from Portsmouth to Riverside?

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

How can I find direct flights from Portsmouth to Riverside?

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

Browse thousands of different options on Cheapflights for your next trip

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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.

Complete your trip

Complete your trip to Riverside by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to California

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Search flights from Portsmouth to Riverside by cabin class

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Portsmouth and Riverside flights

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

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

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

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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 31 August 2026.

Best flights from Portsmouth to Riverside
Discover carefully curated flight deals from Portsmouth to Riverside that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 31 August 2026.

Last-minute flights from Portsmouth to Riverside
Discover last-minute flight deals from Portsmouth to Riverside. Data last updated 31 August 2026 and is based on user searches.

One-way flights from Portsmouth to Riverside
Search for one-way flight options from Portsmouth to Riverside. Find affordable one-way fares based on user searches. Data last updated 31 August 2026.