How long is the flight from Portsmouth to Riverside?

There are many flights that can get you from Portsmouth to Riverside in 21h 56m. Fly via Virgin Atlantic or KLM 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 £2,706, our data shows the cheapest flight currently is £368. When looking at the most popular route, (Southampton Eastleigh - Los Angeles), you can expect to pay £513 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 (89%), Air Canada (85%) and Austrian Airlines (85%).

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.

£463+ 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 16 December 2025.

Tue 23/1217:30SOU - LAX

1 stop26h 15mDelta

Sun 28/1213:45LAX - SOU

1 stop34h 25mDelta

Deal found 13/12£825

Mon 22/1218:05SOU - LAX

1 stop25h 40mDelta

Mon 29/1213:45LAX - SOU

1 stop34h 25mDelta

Deal found 13/12£949

Wed 24/1208:35SOU - LAX

2 stops17h 55mBritish Airways

Mon 29/1220:15LAX - SOU

1 stop31h 40mBritish Airways

Deal found 13/12£1,013

Sat 20/1209:25SOU - LAX

1 stop34h 20mDelta

Wed 31/1213:45LAX - SOU

1 stop19h 40mDelta

Deal found 13/12£1,021

Wed 24/1208:35SOU - LAX

2 stops17h 55mBritish Airways

Sun 28/1218:00LAX - SOU

2 stops18h 20mBritish Airways

Deal found 13/12£1,047

Tue 23/1208:40SOU - LAX

2 stops36h 50mBritish Airways

Mon 29/1220:15LAX - SOU

1 stop31h 40mBritish Airways

Deal found 13/12£1,064

Tue 23/1219:55SOU - LAX

2 stops25h 35mBritish Airways

Sun 28/1218:00LAX - SOU

2 stops18h 20mBritish Airways

Deal found 13/12£1,097

Fri 19/1217:30SOU - LAX

1 stop26h 15mDelta

Tue 30/1213:45LAX - SOU

1 stop34h 35mDelta

Deal found 13/12£1,126

Tue 23/1217:30SOU - LAX

1 stop26h 15mDelta

Thu 1/113:45LAX - SOU

1 stop19h 15mDelta

Deal found 13/12£1,144

Tue 23/1217:30SOU - LAX

1 stop26h 15mDelta

Sat 27/1213:45LAX - SOU

1 stop19h 40mDelta

Deal found 13/12£1,145

Mon 22/1218:05SOU - LAX

1 stop25h 40mDelta

Sat 27/1213:45LAX - SOU

1 stop34h 25mDelta

Deal found 13/12£1,181

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 16 December 2025.

Thu 29/109:00SOU - LAX

1 stop34h 45mVirgin Atlantic

Thu 5/206:00LAX - SOU

2 stops18h 25mVirgin Atlantic

Deal found 15/12£514

Wed 28/109:25SOU - LAX

2 stops21h 56mKLM

Wed 4/206:25LAX - SOU

2 stops18h 00mKLM

Deal found 14/12£541

Mon 12/109:25SOU - LAX

2 stops21h 56mDelta

Mon 19/109:55LAX - SOU

2 stops23h 10mDelta

Deal found 14/12£587

Mon 12/109:30SOU - LAX

1 stop17h 00mBritish Airways

Mon 2/215:30LAX - SOU

2 stops16h 30mBritish Airways

Deal found 15/12£687

Wed 28/117:35SOU - LAX

2 stops31h 03mVirgin Atlantic

Wed 4/206:25LAX - SOU

2 stops18h 00mVirgin Atlantic

Deal found 13/12£541

Mon 12/117:35SOU - LAX

1 stop26h 10mVirgin Atlantic

Mon 19/113:45LAX - SOU

1 stop19h 20mVirgin Atlantic

Deal found 14/12£582

Thu 12/309:30SOU - LAX

1 stop17h 00mBritish Airways

Mon 16/321:15LAX - SOU

1 stop31h 40mBritish Airways

Deal found 12/12£713

Last-minute flights from Portsmouth to Riverside
Discover last-minute flight deals from Portsmouth to Riverside. Data last updated 16 December 2025 and is based on user searches.

Sun 11/120:25SOU - LAX

2 stops25h 05mBritish Airways

Sun 1/220:15LAX - SOU

1 stop15h 25mBritish Airways

Deal found 14/12£796

Mon 12/117:35SOU - LAX

1 stop26h 10mVirgin Atlantic

Mon 19/108:00LAX - SOU

2 stops16h 50mVirgin Atlantic

Deal found 14/12£582

Mon 12/109:25SOU - LAX

2 stops21h 56mDelta

Mon 19/109:55LAX - SOU

2 stops23h 10mDelta

Deal found 14/12£587

Mon 12/109:30SOU - LAX

1 stop17h 00mBritish Airways

Mon 2/215:30LAX - SOU

2 stops16h 30mBritish Airways

Deal found 15/12£687

Wed 28/117:35SOU - LAX

1 stop26h 10mVirgin Atlantic

Wed 4/213:45LAX - SOU

1 stop34h 40mVirgin Atlantic

Deal found 14/12£513

Wed 28/112:25SOU - LAX

1 stop14h 05mAer Lingus

Wed 4/220:15LAX - SOU

1 stop15h 25mAer Lingus

Deal found 13/12£527

Wed 28/109:25SOU - LAX

2 stops21h 56mKLM

Wed 4/206:25LAX - SOU

2 stops18h 00mKLM

Deal found 14/12£541

Thu 29/109:00SOU - LAX

1 stop34h 45mVirgin Atlantic

Thu 5/206:00LAX - SOU

2 stops18h 25mVirgin Atlantic

Deal found 15/12£514

Thu 29/117:35SOU - LAX

3 stops36h 28mMultiple Airlines

Thu 5/208:30LAX - SOU

3 stops26h 50mMultiple Airlines

Deal found 15/12£751

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 16 December 2025.

Mon 13/419:55SOU - LAX

2 stops25h 50mBritish Airways

Deal found 13/12£463

Tue 14/419:55SOU - LAX

2 stops25h 50mBritish Airways

Deal found 13/12£476

Mon 12/109:30SOU - LAX

1 stop17h 00mBritish Airways

Deal found 15/12£696

Thu 15/120:10SOU - LAX

1 stop30h 20mBritish Airways

Deal found 15/12£702

Fri 23/109:30SOU - LAX

1 stop17h 00mBritish Airways

Deal found 13/12£710

Tue 13/120:30SOU - LAX

2 stops30h 00mBritish Airways

Deal found 15/12£716

Sat 24/106:50SOU - LAX

2 stops19h 40mBritish Airways

Deal found 13/12£738

Sat 16/509:10SOU - LAX

3 stops37h 35mMultiple Airlines

Deal found 15/12£843

Sun 11/109:30SOU - LAX

1 stop17h 00mBritish Airways

Deal found 15/12£896

Sat 10/110:15SOU - LAX

2 stops40h 15mBritish Airways

Deal found 15/12£917

Find flight deals from Portsmouth to Riverside

Round-trip from	£513
One-way from	£463
Popular in	July
Cheapest in	February
Average price	£837

Virgin Atlantic
28/1-4/2
3 total stops
42h 35m total
Portsmouth to Riverside

Search Deals

British Airways
13/4
2 total stops
25h 50m total
Portsmouth to Riverside

Search Deals

Highest demand for flights based on searches. 26% potential increase in price (£188 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 6% potential price decrease (£31 potential savings vs. average return price).

Search Deals

Average for round-trip flights in December 2025

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

Thu 29/1

09:00-11:45

1 stop34h 45m

Los Angeles

Thu 5/2

06:00-08:25

2 stops18h 25m

£514

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Wed 28/1

09:25-23:21

2 stops21h 56m

Los Angeles

Wed 4/2

06:25-08:25

2 stops18h 00m

£541

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Wed 28/1

17:35-16:38

2 stops31h 03m

Los Angeles

Wed 4/2

06:25-08:25

2 stops18h 00m

£541

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 12/1

17:35-11:45

1 stop26h 10m

Los Angeles

Mon 19/1

13:45-17:05

1 stop19h 20m

£582

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 12/1

09:25-23:21

2 stops21h 56m

Los Angeles

Mon 19/1

09:55-17:05

2 stops23h 10m

£587

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 12/1

09:30-18:30

1 stop17h 00m

Los Angeles

Mon 2/2

15:30-16:00

2 stops16h 30m

£687

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Thu 12/3

09:30-19:30

1 stop17h 00m

Los Angeles

Mon 16/3

21:15-11:55

1 stop31h 40m

£713

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 13/4

19:55-13:45

2 stops25h 50m

£463

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Tue 14/4

19:55-13:45

2 stops25h 50m

£476

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 12/1

09:30-18:30

1 stop17h 00m

£696

Flights are sorted by cheapest return flights first.

Deals found on 13/12

Showing 1-10 of 17 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 £239). Flying from Portsmouth to Riverside in July is currently the most expensive (average of £403). 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?

It’s optimal to fly from Portsmouth to Riverside in the afternoon. By choosing this option you can save up to 18% on the cost of your flight, compared to a flight in the evening.

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

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

Weekly flight availability from Portsmouth to Riverside

The most flights from P0R to R1V are scheduled on a Sunday (52 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (50 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 21h 56m. Fly via Virgin Atlantic or KLM 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 (89%), Air Canada (85%) and Austrian Airlines (85%).
What are the cheapest flights from Portsmouth to Riverside?
While on average a flight from Portsmouth to Riverside is generally £2,706, our data shows the cheapest flight currently is £368. When looking at the most popular route, (Southampton Eastleigh - Los Angeles), you can expect to pay £513 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 £239). Flying from Portsmouth to Riverside in July is currently the most expensive (average of £403). 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

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Top 10 airlines flying from Portsmouth to Riverside

Airline	Cheapest	Average	Flexibility	On-time
Finnair	Cheapest£280	Average£484	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
SWISS	Cheapest£293	Average£452	FlexibilityNo cancel fee	On-time79%	Search SWISS flights
Norse Atlantic UK	Cheapest£295	Average£529	FlexibilityNo cancel fee	On-timeN/A	Search Norse Atlantic UK flights
Aer Lingus	Cheapest£335	Average£508	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Delta	Cheapest£337	Average£544	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Scandinavian Airlines	Cheapest£339	Average£455	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
Brussels Airlines	Cheapest£359	Average£483	FlexibilityNo cancel fee	On-timeN/A	Search Brussels Airlines flights
Air France	Cheapest£359	Average£492	FlexibilityNo cancel fee	On-time77%	Search Air France flights
KLM	Cheapest£359	Average£526	FlexibilityNo cancel fee	On-time75%	Search KLM flights
TAP AIR PORTUGAL	Cheapest£361	Average£533	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL 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 £463

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 13/4. 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 16 December 2025.

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 16 December 2025.

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 16 December 2025.

Round-trip from

One-way 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 16 December 2025.

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 16 December 2024.

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

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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 16 December 2025.