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$279+ 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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — OPO
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
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Cheapflights Tip: The best prices from Riverside to Porto are usually found in February or October, booked 85 days in advance, depart on a Wednesday or Sunday and return on a Tuesday

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 November 3, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/1. 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.
Mon 12/17:10 pmLAX - OPO
1 stop32h 05mMultiple Airlines
Mon 12/86:15 amOPO - LAX
1 stop17h 00mMultiple Airlines
Deal found 11/1$450
This Kiwi.com deal was found by Cheapflights users on 11/2. 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.
Tue 12/27:10 pmLAX - OPO
1 stop32h 05mMultiple Airlines
Tue 12/91:45 pmOPO - LAX
1 stop33h 30mMultiple Airlines
Deal found 11/2$456
This Kiwi.com deal was found by Cheapflights users on 11/2. 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.
Mon 12/17:10 pmLAX - OPO
1 stop32h 05mSWISS
Mon 12/87:20 pmOPO - LAX
1 stop29h 15mSWISS
Deal found 11/2$462
This Delta deal was found by Cheapflights users on 11/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/28:50 amLAX - OPO
2 stops17h 40mDelta
Tue 12/911:25 amOPO - LAX
1 stop18h 10mDelta
Deal found 11/2$487
This Delta deal was found by Cheapflights users on 11/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/18:55 amLAX - OPO
2 stops17h 35mDelta
Mon 12/86:30 amOPO - LAX
2 stops23h 58mDelta
Deal found 11/2$492
This United Airlines deal was found by Cheapflights users on 11/2. 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 12/28:20 amLAX - OPO
2 stops19h 20mUnited Airlines
Tue 12/912:30 pmOPO - LAX
2 stops19h 59mUnited Airlines
Deal found 11/2$498
This oojo deal was found by Cheapflights users on 11/1. 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 11/84:45 pmLAX - OPO
1 stop18h 10mTAP AIR PORTUGAL
Mon 11/174:10 pmOPO - LAX
1 stop30h 50mTAP AIR PORTUGAL
Deal found 11/1$575
This MaxMilhas deal was found by Cheapflights users on 11/1. 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 MaxMilhas is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/154:45 pmLAX - OPO
1 stop16h 15mTAP AIR PORTUGAL
Sat 11/226:55 amOPO - LAX
1 stop16h 05mTAP AIR PORTUGAL
Deal found 11/1$633
This SWISS deal was found by Cheapflights users on 11/1. 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.
Sat 11/1511:45 amLAX - OPO
2 stops22h 50mSWISS
Sat 11/2211:55 amOPO - LAX
1 stop36h 40mSWISS
Deal found 11/1$659

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 November 3, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$450
(Kiwi.com)

One-way from

$279
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$722
Provider with most accurate pricing for Los Angeles-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Porto flights.
Search Deals
From Riverside to Porto
Search Deals
One-way flight from Riverside to Porto
Search Deals
High demand for flights, 2% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($25 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 November 3, 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

Mon 12/1

7:10 pm-11:15 am

1 stop32h 05m

Porto

Mon 12/8

7:20 pm-4:35 pm

1 stop29h 15m

$462

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Tue 12/2

8:50 am-10:30 am

2 stops17h 40m

Porto

Tue 12/9

11:25 am-9:35 pm

1 stop18h 10m

$487

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Mon 12/1

8:55 am-10:30 am

2 stops17h 35m

Porto

Mon 12/8

6:30 am-10:28 pm

2 stops23h 58m

$492

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Tue 12/2

11:00 pm-11:40 am

2 stops28h 40m

Porto

Tue 12/9

7:25 pm-4:35 pm

1 stop29h 10m

$496

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Tue 12/2

8:20 am-11:40 am

2 stops19h 20m

Porto

Tue 12/9

12:30 pm-12:29 am

2 stops19h 59m

$498

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Tue 1/6

6:00 am-10:30 am

2 stops20h 30m

Porto

Thu 1/15

6:35 am-10:57 pm

2 stops24h 22m

$592

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Sat 11/15

4:45 pm-5:00 pm

1 stop16h 15m

Porto

Sat 11/22

6:55 am-3:00 pm

1 stop16h 05m

$633

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Sat 11/15

11:45 am-6:35 pm

2 stops22h 50m

Porto

Sat 11/22

11:55 am-4:35 pm

1 stop36h 40m

$659

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Fri 11/14

12:55 am-9:30 am

2 stops24h 35m

Porto

Sat 11/22

6:15 am-3:15 pm

1 stop17h 00m

$671

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

Sat 11/15

9:51 am-10:30 am

2 stops16h 39m

Porto

Sat 11/22

6:00 am-7:13 pm

2 stops21h 13m

$683

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/2

Showing 1-10 of 20 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 October 31, 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, May is the cheapest month in which you can book a flight from Riverside to Porto (average of $413). Flying from Riverside to Porto in June is currently the most expensive (average of $821). 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 November 3, 2025.

A simple way to save on the total cost of your ticket is to fly from Riverside to Porto in the evening. If you’re flexible enough to do this you can expect to save up to 36% on your trip compared to booking a flight in the afternoon.

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 Tuesday at noon when fares are most often at their lowest. Thursday 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 November 3, 2025.
See what other customers who have flown with Delta, SWISS, and United 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.
Delta
7.9
Good
7,997 reviews

Entertainment

7.9

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
7.9
Good
7,997 reviews
Delta
7.9
Good
7,997 reviews

Entertainment

7.9

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
SWISS
7.5
Good
1,775 reviews
Delta
7.9
Good
7,997 reviews

Entertainment

7.9

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,993 reviews
Delta
7.9
Good
7,997 reviews

Entertainment

7.9

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
TAP AIR PORTUGAL
7.1
Good
2,042 reviews
Delta
7.9
Good
7,997 reviews

Entertainment

7.9

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Iberia
7.0
Good
3,005 reviews
Delta
7.9
Good
7,997 reviews

Entertainment

7.9

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.

  • How long is the flight from Riverside to Porto?

    Airlines like SWISS, Delta, and United Airlines fly from Riverside to Porto in about 17h 40m. The time it takes to get you to your destination can typically vary by up to 14h 25m. 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, May is the cheapest month in which you can book a flight from Riverside to Porto (average of $413). Flying from Riverside to Porto in June is currently the most expensive (average of $821). 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

Browse thousands of different options on Cheapflights for your next trip

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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 November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
LEVELCheapest$402Average$609FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$533Average$828FlexibilityNo cancel feeOn-time70%
IberiaCheapest$545Average$980FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$550Average$953FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$574Average$1,118FlexibilityNo cancel feeOn-time71%
TAP AIR PORTUGALCheapest$575Average$945FlexibilityNo cancel feeOn-timeN/A
SWISSCheapest$610Average$974FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$667Average$1,091FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$685Average$1,162FlexibilityNo cancel feeOn-time67%
DeltaCheapest$699Average$1,074FlexibilityNo cancel feeOn-timeN/A

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