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Portugal

$304+ Cheap flights from Riverside, CA to Portugal

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 11/28. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — LIS
nov. 29 — dic. 61
sáb. 11/29
sáb. 12/6
1 adult, Economy
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Find flight deals from Riverside to Portugal

Cheapest flights from Riverside to Portugal
Explore the most affordable flight options available from Riverside to Portugal. Find the lowest fares from popular airlines and budget airlines, with prices last updated on octubre 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/30. 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.
jue. 11/275:30 pmLAX - OPO
1 stop22h 10mMultiple Airlines
jue. 12/47:25 pmOPO - LAX
1 stop29h 10mMultiple Airlines
Deal found 10/30$448
This Mytrip deal was found by Cheapflights users on 10/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/275:30 pmLAX - OPO
1 stop22h 10mMultiple Airlines
vie. 12/126:30 amOPO - LAX
2 stops22h 38mMultiple Airlines
Deal found 10/30$456
This Expedia deal was found by Cheapflights users on 10/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/295:30 pmLAX - OPO
1 stop22h 10mMultiple Airlines
sáb. 12/611:55 amOPO - LAX
1 stop36h 40mMultiple Airlines
Deal found 10/30$479
This United Airlines deal was found by Cheapflights users on 10/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/2711:45 amLAX - OPO
1 stop13h 45mUnited Airlines
jue. 12/46:00 amOPO - LAX
3 stops25h 20mUnited Airlines
Deal found 10/30$484
This Delta deal was found by Cheapflights users on 10/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/295:45 amLAX - OPO
2 stops20h 45mDelta
sáb. 12/66:00 amOPO - LAX
2 stops24h 28mDelta
Deal found 10/30$492
This oojo deal was found by Cheapflights users on 10/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/277:10 pmLAX - OPO
1 stop32h 00mSWISS
jue. 12/412:05 pmOPO - LAX
1 stop36h 30mSWISS
Deal found 10/30$493
This Cheapflightsfares deal was found by Cheapflights users on 10/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/295:30 pmLAX - OPO
1 stop22h 10mLufthansa
sáb. 12/61:45 pmOPO - LAX
2 stops31h 20mLufthansa
Deal found 10/30$510
This CheapOair deal was found by Cheapflights users on 10/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/286:30 amLAX - LIS
2 stops18h 50mMultiple Airlines
lun. 12/811:50 amLIS - LAX
1 stop36h 45mMultiple Airlines
Deal found 10/28$512
This KAYAK deal was found by Cheapflights users on 10/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/128:00 amLAX - LIS
2 stops19h 35mLufthansa
lun. 11/242:10 pmLIS - LAX
1 stop33h 05mLufthansa
Deal found 10/29$513
This KAYAK deal was found by Cheapflights users on 10/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/137:10 pmLAX - LIS
1 stop32h 35mSWISS
mar. 11/253:25 pmLIS - LAX
1 stop33h 10mSWISS
Deal found 10/29$514
This United Airlines deal was found by Cheapflights users on 10/28. 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.
jue. 12/1112:30 pmLAX - LIS
1 stop12h 50mUnited Airlines
jue. 12/2510:55 amLIS - LAX
1 stop19h 05mUnited Airlines
Deal found 10/28$515
This Delta deal was found by Cheapflights users on 10/29. 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.
lun. 12/299:30 pmLAX - LIS
1 stop26h 30mDelta
mar. 1/1310:00 amLIS - LAX
2 stops20h 01mDelta
Deal found 10/29$516

Cheap flight deals from Riverside to Portugal

Keep the following information in mind while searching for Riverside to Portugal flight deals. Data was last updated octubre 30, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$448
(Kiwi.com)

One-way from

$304
(Mytrip)

Popular in

December

Cheapest in

February

Average price

$695
Provider with most accurate pricing for Los Angeles-Lisbon Humberto Delgado flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Lisbon Humberto Delgado flights.
Search Deals
From Riverside to Portugal
Search Deals
One-way flight from Riverside to Portugal
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($68 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Riverside to Portugal 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 octubre 30, 2025.
Use the filters below to find and compare flights from Riverside to Portugal that are best for you.

Fly from

Riverside

Fly to

Portugal

Route

Depart

Return

Price

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

sáb. 1/17

7:10 pm-6:35 pm

1 stop15h 25m

Porto

sáb. 1/24

6:00 am-5:17 pm

2 stops19h 17m

$479

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

mié. 2/11

7:10 pm-11:10 am

1 stop32h 00m

Porto

mié. 2/18

12:10 pm-4:35 pm

1 stop36h 25m

$482

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

mar. 2/10

7:10 pm-11:15 am

1 stop32h 05m

Porto

vie. 2/20

7:20 pm-4:35 pm

1 stop29h 15m

$482

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

jue. 11/27

11:45 am-9:30 am

1 stop13h 45m

Porto

jue. 12/4

6:00 am-11:20 pm

3 stops25h 20m

$484

Los AngelesPorto

LAX - OPO

LAXOPO

Los Angeles

sáb. 11/29

5:45 am-10:30 am

2 stops20h 45m

Porto

sáb. 12/6

6:00 am-10:28 pm

2 stops24h 28m

$492

Los AngelesLisbon

LAX - LIS

LAXLIS

Los Angeles

mar. 11/11

5:30 pm-11:30 pm

1 stop22h 00m

Lisbon Humberto Delgado

jue. 11/27

10:15 am-7:35 am

2 stops29h 20m

$512

Los AngelesLisbon

LAX - LIS

LAXLIS

Los Angeles

jue. 1/15

12:30 am-9:20 am

2 stops24h 50m

Lisbon Humberto Delgado

mar. 1/20

6:10 am-3:15 pm

1 stop17h 05m

$516

Los AngelesLisbon

LAX - LIS

LAXLIS

Los Angeles

lun. 12/29

11:30 pm-10:15 am

1 stop26h 45m

Lisbon Humberto Delgado

mié. 1/14

10:15 am-8:44 pm

2 stops18h 29m

$516

Los AngelesLisbon

LAX - LIS

LAXLIS

Los Angeles

mié. 1/28

3:25 pm-3:10 pm

1 stop15h 45m

Lisbon Humberto Delgado

dom. 2/8

5:00 am-6:40 pm

2 stops21h 40m

$521

Los AngelesLisbon

LAX - LIS

LAXLIS

Los Angeles

jue. 1/1

7:55 am-8:00 am

1 stop16h 05m

Lisbon Humberto Delgado

jue. 1/15

5:00 am-6:40 pm

2 stops21h 40m

$521

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 60 results
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Best time to book a flight from Riverside to Portugal

Have a flexible travel schedule? Discover the best time to fly to Portugal 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 Portugal

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

Currently, May is the cheapest month in which you can book a flight from Riverside to Portugal (average of $413). Flying from Riverside to Portugal in June is currently the most expensive (average of $671). 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 PT?

Find hourly flight availability from Riverside to Portugal. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated octubre 30, 2025.

When flying from Riverside to Portugal, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 32% versus a flight in the morning.

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

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

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

Reviews of airlines servicing Portugal

Get insights into the airlines that provide service to Portugal. 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 Portugal. Reviews last updated octubre 30, 2025.
Read reviews from past customers who have flown Delta, United Airlines, and Air Canada from Riverside to Portugal. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
7,998 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

7.9

Entertainment

7.9

Crew

8.5

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
7,998 reviews
Delta
7.9
Good
7,998 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

7.9

Entertainment

7.9

Crew

8.5

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
8,998 reviews
Delta
7.9
Good
7,998 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

7.9

Entertainment

7.9

Crew

8.5

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.
Air Canada
7.1
Good
10,381 reviews
Delta
7.9
Good
7,998 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

7.9

Entertainment

7.9

Crew

8.5

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
2,040 reviews
Delta
7.9
Good
7,998 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

7.9

Entertainment

7.9

Crew

8.5

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.
British Airways
6.7
Okay
7,487 reviews
Delta
7.9
Good
7,998 reviews

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

7.9

Entertainment

7.9

Crew

8.5

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 Portugal. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How popular is this Riverside to Portugal flight route?

    Within the past month, 51 users have taken a look at flights from Riverside to Portugal.

  • How long is the flight from Riverside to Portugal?

    SWISS, United Airlines, and Delta can get you from Riverside to Portugal in just under 13h 45m. Your travel time can differ by up to 18h 15m. Riverside and Portugal are separated by a distance of 5588 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Riverside to Portugal one-way?

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $305. Users have also found prices from $306 and $453 on KLM and Air Canada, respectively.

  • What are the most popular routes from Riverside to Portugal?

    While some choose either Los Angeles - Porto or Los Angeles - Ponta Delgada Nordela, Los Angeles - Lisbon Humberto Delgado is the most popular route from Riverside to Portugal.

  • What are the cheapest flights from Riverside to Portugal?

    While on average a flight from Riverside to Portugal is generally $872, our data shows the cheapest flight currently is $176. When looking at the most popular route, (Los Angeles - Lisbon Humberto Delgado), you can expect to pay $438 for that flight.

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

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

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

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

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

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

    Currently, May is the cheapest month in which you can book a flight from Riverside to Portugal (average of $413). Flying from Riverside to Portugal in June is currently the most expensive (average of $671). 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

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Top 10 airlines flying from Riverside to Portugal

Discover the top 10 airlines that operate flights from Riverside to Portugal. 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 octubre 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
LEVELCheapest$385Average$613FlexibilityNo cancel feeOn-timeN/A
SWISSCheapest$472Average$980FlexibilityNo cancel feeOn-time79%
IberiaCheapest$480Average$840FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$498Average$944FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$505Average$1,028FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$514Average$694FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$515Average$1,081FlexibilityNo cancel feeOn-time69%
VuelingCheapest$522Average$667FlexibilityNo cancel feeOn-time88%
British AirwaysCheapest$533Average$797FlexibilityNo cancel feeOn-time70%
DeltaCheapest$540Average$924FlexibilityNo cancel feeOn-timeN/A

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