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$226+ Cheap flights from Riverside, CA to Porto (OPO)

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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — OPO
Aug 6 — Aug 131
Wed 8/6
Wed 8/13
1 adult, Economy
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Cheapflights Tip: The best prices from Riverside to Porto are usually found in February or October, booked 86 days in advance, depart on a Wednesday or Sunday and return on a Tuesday

Cheap flight deals from Riverside to Porto

Keep the following information in mind while searching for Riverside to Porto flight deals. Data was last updated August 1, 2025.

Round-trip from

$467
(Kiwi.com)

One-way from

$226
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$999
From Riverside to Porto
Search Deals
One-way flight from Riverside to Porto
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High demand for flights, 2% potential price rise
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Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Riverside to Porto

Cheapest flights from Riverside to Porto
Explore the most affordable flight options available from Riverside to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 1, 2025.

This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/54:30 pmLAX - OPO
1 stop32h 45mMultiple Airlines
Sat 10/189:50 pmOPO - LAX
1 stop24h 20mMultiple Airlines
Deal found 7/30$467
This Scandinavian Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/297:30 pmLAX - OPO
1 stop31h 30mScandinavian Airlines
Fri 10/175:55 pmOPO - LAX
1 stop30h 25mScandinavian Airlines
Deal found 7/31$508
This oojo deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/285:45 pmLAX - OPO
1 stop16h 15mTAP AIR PORTUGAL
Wed 11/58:00 pmOPO - LAX
1 stop27h 00mTAP AIR PORTUGAL
Deal found 7/31$576
This United Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/281:15 pmLAX - OPO
1 stop13h 15mUnited Airlines
Wed 11/56:00 amOPO - LAX
2 stops22h 35mUnited Airlines
Deal found 7/31$589
This Iberia deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/97:50 pmLAX - OPO
1 stop17h 25mIberia
Wed 11/199:55 pmOPO - LAX
1 stop29h 15mIberia
Deal found 7/31$599
This SWISS deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/97:10 pmLAX - OPO
1 stop32h 05mSWISS
Thu 11/2012:05 pmOPO - LAX
1 stop36h 30mSWISS
Deal found 7/31$602
This Ovago deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/117:00 amLAX - OPO
2 stops16h 40mBritish Airways
Thu 11/2012:25 pmOPO - LAX
2 stops20h 21mBritish Airways
Deal found 7/31$603
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/286:10 amLAX - OPO
2 stops18h 30mAmerican Airlines
Wed 11/58:20 amOPO - LAX
2 stops21h 02mAmerican Airlines
Deal found 7/30$608

Cheapflights Fare Finder

 
Customize your flight search to find flights from Riverside to Porto 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 2,558,603 searches. Data last updated August 1, 2025.
Use the filters below to find and compare flights from Riverside to Porto that are best for you.

Fly from

Riverside

Fly to

Porto

Route

Depart

Return

Price

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Sun 10/5

4:30 pm-9:15 am

1 stop32h 45m

Porto

Sat 10/18

9:50 pm-2:10 pm

1 stop24h 20m

$467

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Mon 9/29

7:30 pm-11:00 am

1 stop31h 30m

Porto

Fri 10/17

5:55 pm-4:20 pm

1 stop30h 25m

$508

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Tue 10/28

5:45 pm-5:00 pm

1 stop16h 15m

Porto

Wed 11/5

8:00 pm-3:00 pm

1 stop27h 00m

$576

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Tue 10/28

1:15 pm-9:30 am

1 stop13h 15m

Porto

Wed 11/5

6:00 am-8:35 pm

2 stops22h 35m

$589

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Tue 10/28

7:00 am-7:40 am

2 stops17h 40m

Porto

Wed 11/5

12:25 pm-12:46 am

2 stops20h 21m

$608

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Mon 9/22

3:05 pm-2:30 pm

2 stops39h 25m

$226

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Fri 10/24

7:50 pm-9:20 pm

1 stop17h 30m

$307

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Tue 8/19

12:56 am-6:05 am

2 stops21h 09m

$409

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Best time to book a flight from Riverside to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Riverside with our price prediction graph.
Estimated round-trip 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 Riverside to Porto

How far ahead should I book a flight from Riverside to Porto?

Use this chart to determine the optimal time to book a round-trip flight from Riverside to Porto. Price data was last updated on July 25, 2025.

The best time to book flights from Riverside to Porto is 86 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, January is the cheapest month in which you can book a flight from Riverside to Porto (average of $523). Flying from Riverside to Porto in June is currently the most expensive (average of $1,033). 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 R1V to OPO?

Find hourly flight availability from Riverside to Porto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 1, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Riverside to Porto as you normally would.

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

Use this chart to determine the cheapest time to fly round-trip from Riverside to Porto. Price data was last updated on December 16, 2024.

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

How much does it cost to fly round-trip from Riverside to Porto?

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. 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 Porto. Reviews last updated August 1, 2025.
See what other customers who have flown with SWISS, United Airlines, and Scandinavian Airlines from Riverside to Porto have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
SWISS
7.5
Good
1,686 reviews

Food

7.1

Crew

8.2

Overall

7.5

Entertainment

6.8

Boarding

7.7

Comfort

7.4

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.
SWISS
7.5
Good
1,686 reviews
SWISS
7.5
Good
1,686 reviews

Food

7.1

Crew

8.2

Overall

7.5

Entertainment

6.8

Boarding

7.7

Comfort

7.4

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.
United Airlines
7.4
Good
8,900 reviews
SWISS
7.5
Good
1,686 reviews

Food

7.1

Crew

8.2

Overall

7.5

Entertainment

6.8

Boarding

7.7

Comfort

7.4

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.
Scandinavian Airlines
7.4
Good
1,457 reviews
SWISS
7.5
Good
1,686 reviews

Food

7.1

Crew

8.2

Overall

7.5

Entertainment

6.8

Boarding

7.7

Comfort

7.4

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.
American Airlines
7.2
Good
10,000 reviews
SWISS
7.5
Good
1,686 reviews

Food

7.1

Crew

8.2

Overall

7.5

Entertainment

6.8

Boarding

7.7

Comfort

7.4

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.
Air Canada
7.1
Good
9,851 reviews
SWISS
7.5
Good
1,686 reviews

Food

7.1

Crew

8.2

Overall

7.5

Entertainment

6.8

Boarding

7.7

Comfort

7.4

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.

Related info for your journey

Find useful and relevant information for your journey from Riverside to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Porto from Riverside?

    Porto (OPO), located 6.8 mi from the city center, is the airport you fly into when you book flights from Riverside to Porto. 13 airlines have flights to Porto from Riverside on a regular basis. Booking flights from Riverside to Porto should not be difficult; the airport handles an average of 0 inbound flights from Riverside per day.

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

    Yes. In addition to deals on Riverside to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Riverside to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Riverside to Porto.

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

    Yes. Cheapflights offers flight deals from Riverside to Porto 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 Riverside to Porto?

    Currently, January is the cheapest month in which you can book a flight from Riverside to Porto (average of $523). Flying from Riverside to Porto in June is currently the most expensive (average of $1,033). 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

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Aveiro
Coimbra

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Top 10 airlines flying from Riverside to Porto

Discover the top 10 airlines that operate flights from Riverside to Porto. 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 2,558,603 searches. Data last updated August 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
LEVELCheapest$402Average$609FlexibilityNo cancel feeOn-timeN/A
VuelingCheapest$535Average$841FlexibilityNo cancel feeOn-time88%
American AirlinesCheapest$574Average$1,066FlexibilityNo cancel feeOn-time71%
IberiaCheapest$585Average$1,004FlexibilityNo cancel feeOn-time77%
SWISSCheapest$591Average$936FlexibilityNo cancel feeOn-time79%
TAP AIR PORTUGALCheapest$592Average$956FlexibilityNo cancel feeOn-timeN/A
Air FranceCheapest$682Average$940FlexibilityNo cancel feeOn-time77%
KLMCheapest$682Average$985FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$685Average$771FlexibilityNo cancel feeOn-time67%
DeltaCheapest$699Average$1,050FlexibilityNo cancel feeOn-timeN/A

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