How long is the flight from Portsmouth to Riverside?

There are many flights that can get you from Portsmouth to Riverside in 14h 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.

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 £2,568, our data shows the cheapest flight currently is £334. When looking at the most popular route, (Southampton Eastleigh - Los Angeles), you can expect to pay £460 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 (94%), Air Canada (88%) and Austrian Airlines (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.

£460+ Flights from Portsmouth to Riverside

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 28 January 2026.

Wed 11/312:25

SOU

LAX

1 stop14h 05m

British Airways

Wed 18/321:15

LAX

SOU

1 stop15h 25m

British Airways

Deal found 26/1£460

Thu 12/309:30

SOU

LAX

1 stop17h 00m

British Airways

Thu 19/321:15

LAX

SOU

1 stop15h 25m

British Airways

Deal found 26/1£474

Wed 11/317:35

SOU

LAX

1 stop26h 10m

Delta

Wed 18/306:00

LAX

SOU

2 stops19h 20m

Delta

Deal found 26/1£480

Thu 19/220:10

SOU

LAX

1 stop30h 20m

British Airways

Mon 23/220:15

LAX

SOU

1 stop35h 20m

British Airways

Deal found 26/1£489

Thu 12/308:50

SOU

LAX

1 stop34h 55m

KLM

Thu 19/308:25

LAX

SOU

2 stops16h 55m

KLM

Deal found 26/1£494

Sat 20/609:10

SOU

LAX

1 stop17h 15m

British Airways

Sun 5/720:55

LAX

SOU

2 stops27h 30m

British Airways

Deal found 26/1£572

Sun 11/1016:45

SOU

LAX

2 stops29h 00m

British Airways

Tue 20/1020:10

LAX

SOU

1 stop15h 20m

British Airways

Deal found 27/1£575

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 28 January 2026.

Wed 11/312:25

SOU

LAX

1 stop14h 05m

British Airways

Wed 18/321:15

LAX

SOU

1 stop15h 25m

British Airways

Deal found 26/1£460

Wed 11/317:35

SOU

LAX

1 stop26h 10m

Delta

Wed 18/306:00

LAX

SOU

2 stops19h 20m

Delta

Deal found 26/1£480

Thu 12/308:50

SOU

LAX

1 stop34h 55m

KLM

Thu 19/308:25

LAX

SOU

2 stops16h 55m

KLM

Deal found 26/1£494

Thu 19/220:10

SOU

LAX

1 stop30h 20m

British Airways

Mon 23/220:15

LAX

SOU

1 stop35h 20m

British Airways

Deal found 25/1£489

Sat 20/609:10

SOU

LAX

1 stop17h 15m

British Airways

Sun 5/720:55

LAX

SOU

2 stops27h 30m

British Airways

Deal found 26/1£572

Last-minute flights from Portsmouth to Riverside
Discover last-minute flight deals from Portsmouth to Riverside. Data last updated 28 January 2026 and is based on user searches.

Fri 30/120:10

SOU

LAX

2 stops25h 20m

Aer Lingus

Thu 5/220:15

LAX

SOU

1 stop15h 25m

Aer Lingus

Deal found 26/1£751

Thu 19/220:10

SOU

LAX

1 stop30h 20m

British Airways

Mon 23/220:15

LAX

SOU

1 stop35h 20m

British Airways

Deal found 25/1£489

Mon 23/209:30

SOU

LAX

1 stop17h 00m

British Airways

Mon 16/322:00

LAX

SOU

2 stops27h 10m

British Airways

Deal found 26/1£597

Wed 25/212:25

SOU

LAX

1 stop14h 05m

British Airways

Mon 2/318:00

LAX

SOU

2 stops18h 20m

British Airways

Deal found 27/1£603

Wed 25/212:25

SOU

LAX

1 stop14h 05m

British Airways

Wed 18/321:15

LAX

SOU

1 stop15h 25m

British Airways

Deal found 28/1£677

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 28 January 2026.

Tue 9/608:55

SOU

LAX

2 stops17h 30m

British Airways

Deal found 26/1£543

Mon 15/609:10

SOU

LAX

1 stop17h 15m

British Airways

Deal found 27/1£545

Mon 22/606:50

SOU

LAX

2 stops19h 35m

British Airways

Deal found 27/1£583

Thu 18/609:10

SOU

LAX

1 stop17h 15m

British Airways

Deal found 26/1£585

Fri 12/619:55

SOU

LAX

2 stops25h 50m

British Airways

Deal found 26/1£647

Fri 1/519:55

SOU

LAX

2 stops25h 50m

British Airways

Deal found 26/1£721

Find flight deals from Portsmouth to Riverside

Round-trip from	£460
Popular in	July
Cheapest in	February
Average price	£427

British Airways
11/3-18/3
2 total stops
29h 30m total
Portsmouth to Riverside

Search Deals

Highest demand for flights based on searches. 31% potential increase in price (£213 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 7% potential price decrease (£33 potential savings vs. average return price).

Search Deals

Average for round-trip flights in January 2026

Search Deals

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

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Wed 11/3

12:25-19:30

1 stop14h 05m

Los Angeles

Wed 18/3

21:15-19:40

1 stop15h 25m

£460

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Wed 11/3

17:35-12:45

1 stop26h 10m

Los Angeles

Wed 18/3

06:00-08:20

2 stops19h 20m

£480

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Thu 19/2

20:10-18:30

1 stop30h 20m

Los Angeles

Mon 23/2

20:15-15:35

1 stop35h 20m

£489

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Thu 12/3

08:50-12:45

1 stop34h 55m

Los Angeles

Thu 19/3

08:25-08:20

2 stops16h 55m

£494

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Sat 20/6

09:10-18:25

1 stop17h 15m

Los Angeles

Sun 5/7

20:55-08:25

2 stops27h 30m

£572

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Tue 9/6

06:50-18:25

2 stops19h 35m

£556

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 22/6

06:50-18:25

2 stops19h 35m

£583

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Thu 18/6

09:10-18:25

1 stop17h 15m

£585

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 15/6

19:55-14:55

2 stops27h 00m

£637

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Fri 12/6

19:55-13:45

2 stops25h 50m

£647

Flights are sorted by cheapest return flights first.

Deals found on 27/1

Showing 1-10 of 12 results

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 £233). Flying from Portsmouth to Riverside in July is currently the most expensive (average of £384). 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?

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 Monday (50 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (36 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 14h 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 (94%), Air Canada (88%) and Austrian Airlines (88%).
What are the cheapest flights from Portsmouth to Riverside?
While on average a flight from Portsmouth to Riverside is generally £2,568, our data shows the cheapest flight currently is £334. When looking at the most popular route, (Southampton Eastleigh - Los Angeles), you can expect to pay £460 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 £233). Flying from Portsmouth to Riverside in July is currently the most expensive (average of £384). 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Portsmouth to Riverside

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Top 10 airlines flying from Portsmouth to Riverside

Airline	Cheapest	Average	Flexibility	On-time
Iberia	Cheapest£233	Average£516	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
SWISS	Cheapest£271	Average£487	FlexibilityNo cancel fee	On-time79%	Search SWISS flights
Finnair	Cheapest£273	Average£485	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Norse Atlantic UK	Cheapest£276	Average£495	FlexibilityNo cancel fee	On-timeN/A	Search Norse Atlantic UK flights
Aer Lingus	Cheapest£326	Average£482	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Brussels Airlines	Cheapest£326	Average£473	FlexibilityNo cancel fee	On-timeN/A	Search Brussels Airlines flights
Delta	Cheapest£329	Average£518	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Scandinavian Airlines	Cheapest£335	Average£443	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
Austrian Airlines	Cheapest£345	Average£473	FlexibilityNo cancel fee	On-time78%	Search Austrian Airlines flights
KLM	Cheapest£347	Average£535	FlexibilityNo cancel fee	On-time75%	Search KLM flights

Fly with Cheapflights

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 £460

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/3. 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 28 January 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 28 January 2026.

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 28 January 2026.

Round-trip from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

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?

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 28 January 2026.

Weekly flight availability 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?

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?

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

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.

Top 10 airlines flying from Portsmouth to Riverside

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?

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

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 28 January 2026.