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$232+ 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 10/12. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — OPO
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheapflights Tip: The best prices from Riverside to Porto are usually found in February or November, booked 85 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 September 16, 2025.

Round-trip from

$470
(Scandinavian Airlines)

One-way from

$232
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$928
From Riverside to Porto
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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 ($24 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 16, 2025.

This oojo deal was found by Cheapflights users on 9/16. 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.
Sat 10/184:40 pmLAX - OPO
1 stop16h 20mTAP AIR PORTUGAL
Sat 11/16:55 amOPO - LAX
1 stop16h 05mTAP AIR PORTUGAL
Deal found 9/16$525
This oojo deal was found by Cheapflights users on 9/14. 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 stop14h 15mTAP AIR PORTUGAL
Fri 11/78:05 pmOPO - LAX
1 stop26h 55mTAP AIR PORTUGAL
Deal found 9/14$526
This FlightHub deal was found by Cheapflights users on 9/15. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/84:45 pmLAX - OPO
1 stop16h 15mTAP AIR PORTUGAL
Sat 11/156:55 amOPO - LAX
1 stop16h 05mTAP AIR PORTUGAL
Deal found 9/15$529
This Booking.com deal was found by Cheapflights users on 9/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/44:40 pmLAX - OPO
1 stop18h 20mTAP AIR PORTUGAL
Fri 10/174:00 pmOPO - LAX
1 stop30h 40mTAP AIR PORTUGAL
Deal found 9/15$533
This Mytrip deal was found by Cheapflights users on 9/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/148:05 amLAX - OPO
2 stops22h 55mMultiple Airlines
Mon 10/207:25 pmOPO - LAX
2 stops27h 50mMultiple Airlines
Deal found 9/15$537
This TAP AIR PORTUGAL deal was found by Cheapflights users on 9/15. 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 TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/34:40 pmLAX - OPO
1 stop19h 45mTAP AIR PORTUGAL
Thu 10/164:00 pmOPO - LAX
1 stop30h 35mTAP AIR PORTUGAL
Deal found 9/15$551
This Expedia deal was found by Cheapflights users on 9/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/214:40 pmLAX - OPO
1 stop22h 05mTAP AIR PORTUGAL
Tue 10/286:55 amOPO - LAX
1 stop16h 05mTAP AIR PORTUGAL
Deal found 9/15$553
This United Airlines deal was found by Cheapflights users on 9/16. 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 10/2812:30 pmLAX - OPO
1 stop14h 00mUnited Airlines
Wed 11/56:00 amOPO - LAX
2 stops24h 55mUnited Airlines
Deal found 9/16$560
This United Airlines deal was found by Cheapflights users on 9/14. 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 10/288:15 amLAX - OPO
2 stops18h 15mUnited Airlines
Fri 11/76:00 amOPO - LAX
2 stops23h 25mUnited Airlines
Deal found 9/14$564
This Booking.com deal was found by Cheapflights users on 9/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/298:10 pmLAX - OPO
1 stop32h 00mSWISS
Wed 11/57:20 pmOPO - LAX
1 stop29h 15mSWISS
Deal found 9/14$571

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 September 16, 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

Tue 11/18

4:45 pm-6:55 pm

1 stop18h 10m

Porto

Fri 11/28

3:55 pm-3:00 pm

1 stop31h 05m

$526

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Tue 10/21

4:40 pm-10:45 pm

1 stop22h 05m

Porto

Tue 10/28

6:55 am-4:00 pm

1 stop16h 05m

$553

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Tue 1/6

7:50 pm-9:15 pm

1 stop17h 25m

Porto

Thu 1/15

8:45 am-7:10 pm

1 stop18h 25m

$555

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Tue 10/28

12:30 pm-9:30 am

1 stop14h 00m

Porto

Wed 11/5

6:00 am-10:55 pm

2 stops24h 55m

$560

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Tue 10/28

1:15 pm-9:30 am

1 stop13h 15m

Porto

Fri 11/7

6:00 am-9:25 pm

2 stops23h 25m

$560

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Wed 1/7

7:10 pm-11:10 am

1 stop32h 00m

Porto

Mon 1/19

12:05 pm-4:35 pm

1 stop36h 30m

$578

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Tue 1/6

4:30 pm-11:40 am

2 stops35h 10m

Porto

Thu 1/15

6:00 am-3:17 pm

2 stops41h 17m

$586

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Sun 10/12

7:45 pm-2:20 pm

1 stop34h 35m

$232

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Tue 10/14

6:50 pm-8:10 am

1 stop29h 20m

$254

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Wed 10/15

7:45 pm-7:00 pm

1 stop15h 15m

$270

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 14 results
1
2

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 September 12, 2025.

The best time to book flights from Riverside to Porto is 85 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 $1,027). 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 September 16, 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.

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 September 16, 2025.
See what other customers who have flown with SWISS, United Airlines, and TAP AIR PORTUGAL 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
7.6
Good
1,737 reviews

Entertainment

6.8

Overall

7.6

Food

7.1

Crew

8.2

Comfort

7.4

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

AMS - ZRH

Efficient, professional on board attendants. Food offering just right. On time.
SWISS
7.6
Good
1,737 reviews
SWISS
7.6
Good
1,737 reviews

Entertainment

6.8

Overall

7.6

Food

7.1

Crew

8.2

Comfort

7.4

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

AMS - ZRH

Efficient, professional on board attendants. Food offering just right. On time.
United Airlines
7.4
Good
8,924 reviews
SWISS
7.6
Good
1,737 reviews

Entertainment

6.8

Overall

7.6

Food

7.1

Crew

8.2

Comfort

7.4

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

AMS - ZRH

Efficient, professional on board attendants. Food offering just right. On time.
TAP AIR PORTUGAL
7.1
Good
1,975 reviews
SWISS
7.6
Good
1,737 reviews

Entertainment

6.8

Overall

7.6

Food

7.1

Crew

8.2

Comfort

7.4

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

AMS - ZRH

Efficient, professional on board attendants. Food offering just right. On time.
Iberia
7.0
Good
2,924 reviews
SWISS
7.6
Good
1,737 reviews

Entertainment

6.8

Overall

7.6

Food

7.1

Crew

8.2

Comfort

7.4

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

AMS - ZRH

Efficient, professional on board attendants. Food offering just right. On time.

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. 14 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.

  • How long is the flight from Riverside to Porto?

    Airlines like TAP AIR PORTUGAL, Iberia, and United Airlines fly from Riverside to Porto in about 14h. The time it takes to get you to your destination can typically vary by up to 4h 10m. There are 5588 mi between Riverside and Porto. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 $1,027). 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
Arcos de Valdevez
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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
LEVELCheapest$402Average$606FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$545Average$938FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$574Average$1,066FlexibilityNo cancel feeOn-time71%
TAP AIR PORTUGALCheapest$583Average$948FlexibilityNo cancel feeOn-timeN/A
SWISSCheapest$610Average$934FlexibilityNo cancel feeOn-time79%
VuelingCheapest$625Average$841FlexibilityNo cancel feeOn-time88%
British AirwaysCheapest$628Average$834FlexibilityNo cancel feeOn-time70%
Air CanadaCheapest$685Average$1,273FlexibilityNo cancel feeOn-time67%
LufthansaCheapest$711Average$1,183FlexibilityNo cancel feeOn-time76%
KLMCheapest$719Average$1,044FlexibilityNo cancel feeOn-time75%

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