$265+ 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 8/3. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from Riverside to Porto with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.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 June 12, 2025.
Round-trip from | $787 (Kiwi.com) |
|---|---|
One-way from | $265 (Kiwi.com) |
Popular in | December |
Cheapest in | February |
Average price | $1,071 |
Find flight deals from Riverside to Porto
Cheapest flights from Riverside to PortoExplore 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 June 12, 2025.
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 June 12, 2025.
This Kiwi.com deal was found by Cheapflights users on 6/10. 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.
This FlightHub deal was found by Cheapflights users on 6/10. 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.
This Air Canada deal was found by Cheapflights users on 6/11. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This FlightHub deal was found by Cheapflights users on 6/10. 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.
This Austrian Airlines deal was found by Cheapflights users on 6/11. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 6/10. 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.
This Cheapflightsfares deal was found by Cheapflights users on 6/12. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Delta deal was found by Cheapflights users on 6/11. 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.
This Cheapflightsfares deal was found by Cheapflights users on 6/12. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This SmartFares deal was found by Cheapflights users on 6/11. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This SWISS deal was found by Cheapflights users on 6/11. 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.
This KLM deal was found by Cheapflights users on 6/10. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight 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 June 12, 2025.
Use the filters below to find and compare flights from Riverside to Porto that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
Los AngelesPorto
LAX - OPO
LAXOPO
Los Angeles
Tue 9/2
5:25 am-3:05 pm
2 stops25h 40m
Porto
Sun 9/7
6:25 am-5:30 pm
1 stop19h 05m
Los AngelesPorto
LAX - OPO
LAXOPO
Los Angeles
Sat 8/16
12:05 pm-9:35 am
1 stop13h 30m
Porto
Wed 8/27
6:00 am-4:55 pm
1 stop18h 55m
Los AngelesPorto
LAX - OPO
LAXOPO
Los Angeles
Sat 8/30
4:40 pm-8:25 pm
1 stop19h 45m
Porto
Mon 9/8
10:35 pm-2:40 pm
1 stop24h 05m
Los AngelesPorto
LAX - OPO
LAXOPO
Los Angeles
Sun 8/10
3:05 pm-12:40 pm
1 stop37h 35m
Porto
Sun 8/17
6:35 pm-1:00 pm
2 stops50h 25m
Los AngelesPorto
LAX - OPO
LAXOPO
Los Angeles
Sun 7/13
5:30 pm-11:15 am
2 stops33h 45m
Porto
Wed 8/27
6:15 am-4:55 pm
2 stops18h 40m
Los AngelesPorto
LAX - OPO
LAXOPO
Los Angeles
Mon 8/4
2:10 pm-3:35 pm
2 stops17h 25m
Porto
Wed 8/20
6:15 am-8:07 pm
2 stops21h 52m
Los AngelesPorto
LAX - OPO
LAXOPO
Los Angeles
Sat 8/30
7:30 pm-11:10 am
1 stop31h 40m
Porto
Fri 9/5
5:55 pm-4:20 pm
1 stop30h 25m
Los AngelesPorto
LAX - OPO
LAXOPO
Los Angeles
Wed 9/10
12:10 am-9:45 am
1 stop25h 35m
Porto
Wed 9/24
4:50 pm-11:45 am
1 stop26h 55m
Los AngelesPorto
LAX - OPO
LAXOPO
Los Angeles
Fri 8/15
8:40 pm-9:35 am
2 stops28h 55m
Porto
Sun 8/24
11:20 am-10:30 am
2 stops31h 10m
Los AngelesPorto
LAX - OPO
LAXOPO
Los Angeles
Mon 8/4
5:50 pm-7:55 pm
1 stop18h 05m
Porto
Wed 8/13
8:15 am-4:05 pm
1 stop15h 50m
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.
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 June 9, 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 $1,047). 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 June 12, 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.
Rainfall in Porto by month
Plan your trip to Porto by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Porto ranges from 0.7 - 7.7 inches per month. December is typically the wettest month, when rainfall can reach 7.7 in. July is typically the driest time to visit Porto when rainfall is around 0.7 in.
Temperature in Porto by month
Plan your trip to Porto by taking into account the average temperature totals by month.
If weather is an important factor for your trip to Porto, 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 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).
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 June 12, 2025.
Read through reviews of airlines operating flights from Riverside to Porto, such as Delta, KLM and Austrian Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Crew
Overall
Food
Comfort
Entertainment
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
Crew
Overall
Food
Comfort
Entertainment
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
Crew
Overall
Food
Comfort
Entertainment
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
Crew
Overall
Food
Comfort
Entertainment
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
Crew
Overall
Food
Comfort
Entertainment
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
Crew
Overall
Food
Comfort
Entertainment
Boarding
Reviews
Aaron,Oct 2024
LAX - LHR
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.
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Alternative routes for Riverside to Porto
See prices for flight routes from nearby airports that may be better suited for you.
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 June 12, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$421 | Average$666 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$502 | Average$800 | FlexibilityNo cancel fee | On-time88% | |
| Cheapest$592 | Average$962 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$610 | Average$946 | FlexibilityNo cancel fee | On-time79% | |
| Cheapest$636 | Average$963 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$664 | Average$1,002 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$682 | Average$1,053 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$688 | Average$805 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$690 | Average$1,102 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$760 | Average$1,081 | FlexibilityNo cancel fee | On-time76% |