How long is the flight from Portsmouth to Riverside?

There are many flights that can get you from Portsmouth to Riverside in 16h 45m. 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 £2,637, our data shows the cheapest flight currently is £376. When looking at the most popular route, (Southampton Eastleigh - Los Angeles), you can expect to pay £472 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 Aeromexico (84%), KLM (83%) and Air France (83%).

What are the most popular airlines that fly from Portsmouth to Riverside?

Before booking your flight from Portsmouth to Riverside check out the most popular airlines for this route: American Airlines, Air Canada or Air France.

How far in advance should I book a flight from Portsmouth to Riverside?

Users have found that booking a flight from Portsmouth to Riverside at least 56 days early can save you up to 38% on average compared to booking a flight this week. If booking 56 days before your flight isn’t an option for you, users have found flights from Portsmouth to Riverside for as little as £425 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as £667 for flights departing within the next 3 days.

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

Due to multiple factors, expect to potentially pay more when booking in December. For low rates, September can be a great choice for travel to Riverside. Flights to Riverside from Portsmouth in September are about £481 on average during September, but can be found for as low as £306.

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.

£403+ Flights from Portsmouth to Riverside

Q: How much does it cost for a return flight from Portsmouth to Riverside?

Airfare is below average for this route at the moment. Portsmouth to Riverside flights typically cost between £628 and £873 in September. The cheapest return flight price found within the last 3 days was £616 on British Airways (26 Sept-8 Oct).

Cheap flight deals from Portsmouth to Riverside

Round-trip from	£616
One-way from	£403
Popular in	July
Cheapest in	February
Average price	£850

British Airways
26/9-8/10
2 total stops
32h 00m total
Portsmouth to Riverside

Search Deals

Aer Lingus
28/11
1 total stop
17h 00m total
Portsmouth to Riverside

Search Deals

Highest demand for flights based on searches. 28% potential increase in price (£228 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 9% potential price decrease (£51 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2025

Search Deals

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 12 September 2025.

Fri 26/909:40SOU - LAX

1 stop16h 45mBritish Airways

Wed 8/1020:15LAX - SOU

1 stop15h 15mBritish Airways

Deal found 11/9£616

Sun 26/1018:05SOU - LAX

1 stop25h 40mVirgin Atlantic

Sun 2/1113:45LAX - SOU

1 stop34h 25mVirgin Atlantic

Deal found 11/9£628

Sun 26/1009:30SOU - LAX

1 stop17h 00mBritish Airways

Sun 2/1118:00LAX - SOU

2 stops18h 20mBritish Airways

Deal found 11/9£633

Sat 25/1016:25SOU - LAX

1 stop35h 05mMultiple Airlines

Sat 1/1112:20LAX - SOU

2 stops44h 15mMultiple Airlines

Deal found 10/9£657

Tue 7/1009:10SOU - LAX

1 stop17h 15mBritish Airways

Thu 16/1020:15LAX - SOU

1 stop15h 15mBritish Airways

Deal found 10/9£687

Wed 8/1009:10SOU - LAX

1 stop17h 15mBritish Airways

Wed 15/1017:05LAX - SOU

2 stops18h 20mBritish Airways

Deal found 10/9£694

Thu 18/909:40SOU - LAX

1 stop16h 45mBritish Airways

Thu 30/1016:30LAX - SOU

2 stops20h 00mBritish Airways

Deal found 10/9£807

Sun 26/1018:05SOU - LAX

3 stops31h 00mMultiple Airlines

Sun 2/1107:05LAX - SOU

3 stops24h 30mMultiple Airlines

Deal found 11/9£836

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 12 September 2025.

Fri 26/909:40SOU - LAX

1 stop16h 45mBritish Airways

Wed 8/1020:15LAX - SOU

1 stop15h 15mBritish Airways

Deal found 11/9£616

Sat 25/1016:25SOU - LAX

1 stop35h 05mMultiple Airlines

Sat 1/1112:20LAX - SOU

2 stops44h 15mMultiple Airlines

Deal found 10/9£657

Sun 26/1009:30SOU - LAX

1 stop17h 00mBritish Airways

Sun 2/1118:00LAX - SOU

2 stops18h 20mBritish Airways

Deal found 11/9£633

Tue 7/1009:10SOU - LAX

1 stop17h 15mBritish Airways

Thu 16/1020:15LAX - SOU

1 stop15h 15mBritish Airways

Deal found 10/9£687

Sun 26/1018:05SOU - LAX

3 stops31h 00mMultiple Airlines

Sun 2/1107:05LAX - SOU

3 stops24h 30mMultiple Airlines

Deal found 11/9£836

Wed 8/1009:10SOU - LAX

1 stop17h 15mBritish Airways

Wed 15/1017:05LAX - SOU

2 stops18h 20mBritish Airways

Deal found 10/9£694

Last-minute flights from Portsmouth to Riverside
Discover last-minute flight deals from Portsmouth to Riverside. Data last updated 12 September 2025 and is based on user searches.

Thu 18/909:40SOU - LAX

1 stop16h 45mBritish Airways

Thu 30/1016:30LAX - SOU

2 stops20h 00mBritish Airways

Deal found 10/9£807

Fri 26/909:40SOU - LAX

1 stop16h 45mBritish Airways

Wed 8/1020:15LAX - SOU

1 stop15h 15mBritish Airways

Deal found 11/9£616

Tue 7/1009:10SOU - LAX

1 stop17h 15mBritish Airways

Thu 16/1020:15LAX - SOU

1 stop15h 15mBritish Airways

Deal found 10/9£687

Wed 8/1009:10SOU - LAX

1 stop17h 15mBritish Airways

Wed 15/1017:05LAX - SOU

2 stops18h 20mBritish Airways

Deal found 10/9£694

Sat 25/1016:25SOU - LAX

1 stop35h 05mMultiple Airlines

Sat 1/1112:20LAX - SOU

2 stops44h 15mMultiple Airlines

Deal found 10/9£657

Sun 26/1018:05SOU - LAX

1 stop25h 40mVirgin Atlantic

Sun 2/1113:45LAX - SOU

1 stop34h 25mVirgin Atlantic

Deal found 11/9£628

Sun 26/1009:30SOU - LAX

1 stop17h 00mBritish Airways

Sun 2/1118:00LAX - SOU

2 stops18h 20mBritish Airways

Deal found 11/9£633

Sun 26/1018:05SOU - LAX

3 stops31h 00mMultiple Airlines

Sun 2/1107:05LAX - SOU

3 stops24h 30mMultiple Airlines

Deal found 11/9£836

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 12 September 2025.

Fri 28/1109:30SOU - LAX

1 stop17h 00mAer Lingus

Deal found 10/9£403

Mon 3/1109:30SOU - LAX

1 stop17h 00mBritish Airways

Deal found 10/9£442

Sun 9/1116:05SOU - LAX

1 stop34h 25mBritish Airways

Deal found 10/9£447

Tue 11/1119:40SOU - LAX

2 stops30h 50mBritish Airways

Deal found 10/9£463

Mon 10/1112:40SOU - LAX

2 stops32h 50mBritish Airways

Deal found 10/9£464

Sat 8/1109:30SOU - LAX

1 stop17h 00mBritish Airways

Deal found 10/9£484

Fri 14/1120:10SOU - LAX

1 stop30h 20mBritish Airways

Deal found 10/9£489

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

Fri 26/9

09:40-18:25

1 stop16h 45m

Los Angeles

Wed 8/10

20:15-19:30

1 stop15h 15m

£616

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Sun 26/10

09:30-19:30

1 stop17h 00m

Los Angeles

Sun 2/11

18:00-20:20

2 stops18h 20m

£633

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Sat 25/10

16:25-19:30

1 stop35h 05m

Los Angeles

Sat 1/11

12:20-15:35

2 stops44h 15m

£657

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Tue 7/10

09:10-18:25

1 stop17h 15m

Los Angeles

Thu 16/10

20:15-19:30

1 stop15h 15m

£687

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Wed 8/10

09:10-18:25

1 stop17h 15m

Los Angeles

Wed 15/10

17:05-19:25

2 stops18h 20m

£694

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Sun 26/10

18:05-18:05

3 stops31h 00m

Los Angeles

Sun 2/11

07:05-15:35

3 stops24h 30m

£836

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Fri 28/11

09:30-18:30

1 stop17h 00m

£403

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 10/11

09:30-18:30

1 stop17h 00m

£442

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Wed 12/11

12:25-18:30

1 stop14h 05m

£442

SouthamptonLos Angeles

SOU - LAX

SOULAX

Southampton Eastleigh

Mon 3/11

09:30-18:30

1 stop17h 00m

£442

Flights are sorted by cheapest return flights first.

Deals found on 10/9

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, 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?

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?

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

The most flights from P0R to R1V are scheduled on a Monday (53 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (47 on average).

How much does it cost for a return flight from Portsmouth to Riverside?

Reviews of airlines servicing Riverside

Check out reviews from past customers who have flown with British Airways from Portsmouth to Riverside to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

British Airways

6.7

Okay

7,361 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,May 2025

LHR - LAX

We needed assistance (wheelchair, golf cart, whatever ) to get to next gate. We requested it. None was provided.

British Airways

6.7

Okay

7,361 reviews

British Airways

6.7

Okay

7,361 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,May 2025

LHR - LAX

We needed assistance (wheelchair, golf cart, whatever ) to get to next gate. We requested it. None was provided.

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 16h 45m. 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 Aeromexico (84%), KLM (83%) and Air France (83%).
What are the cheapest flights from Portsmouth to Riverside?
While on average a flight from Portsmouth to Riverside is generally £2,637, our data shows the cheapest flight currently is £376. When looking at the most popular route, (Southampton Eastleigh - Los Angeles), you can expect to pay £472 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

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£277	Average£466	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
SWISS	Cheapest£289	Average£492	FlexibilityNo cancel fee	On-time79%	Search SWISS flights
Norse Atlantic UK	Cheapest£292	Average£522	FlexibilityNo cancel fee	On-timeN/A	Search Norse Atlantic UK flights
Aer Lingus	Cheapest£331	Average£564	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Delta	Cheapest£333	Average£533	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
KLM	Cheapest£343	Average£545	FlexibilityNo cancel fee	On-time75%	Search KLM flights
Scandinavian Airlines	Cheapest£344	Average£481	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
Air France	Cheapest£352	Average£457	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Austrian Airlines	Cheapest£354	Average£468	FlexibilityNo cancel fee	On-time78%	Search Austrian Airlines flights
United Airlines	Cheapest£357	Average£558	FlexibilityNo cancel fee	On-time69%	Search United Airlines 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 £403

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 28/11. Fares are subject to change and may not be available on all flights or dates of travel.

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 12 September 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find 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 12 September 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 12 September 2025.

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 12 September 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 29 September 2024.

Weekly flight availability from Portsmouth to Riverside

How much does it cost for a return flight from Portsmouth to Riverside?

Reviews of airlines servicing Riverside

Check out reviews from past customers who have flown with British Airways from Portsmouth to Riverside to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

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 12 September 2025.