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$78+ Cheap flights from Portland (PDX) to Riverside, CA

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 9/19. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — LAX
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Portland to Riverside are usually found in January or February, booked 57 days in advance, depart on a Thursday or Friday and return on a Saturday

Cheap flight deals from Portland to Riverside

Keep the following information in mind while searching for Portland to Riverside flight deals. Data was last updated September 11, 2025.

Round-trip from

$119
(Southwest)

One-way from

$78
(Mytrip)

Popular in

November

Cheapest in

January

Average price

$177
From Portland to Riverside
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One-way flight from Portland to Riverside
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Highest demand for flights based on searches. 8% potential increase in price ($17 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($5 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 Portland to Riverside

Cheapest flights from Portland to Riverside
Explore the most affordable flight options available from Portland to Riverside. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Southwest deal was found by Cheapflights users on 9/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/117:15 amPDX - LAX
1 stop3h 45mSouthwest
Wed 11/125:30 pmLAX - PDX
1 stop3h 55mSouthwest
Deal found 9/11$119
This Frontier deal was found by Cheapflights users on 9/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/271:38 pmPDX - LAX
Nonstop2h 28mFrontier
Sun 9/289:44 amLAX - PDX
Nonstop2h 24mFrontier
Deal found 9/11$122
This Southwest deal was found by Cheapflights users on 9/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/146:15 amPDX - LAX
1 stop4h 20mSouthwest
Tue 10/215:15 pmLAX - PDX
1 stop5h 25mSouthwest
Deal found 9/11$124
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Fri 11/710:03 amPDX - LAX
1 stop5h 19mFrontier
Fri 11/1410:21 amLAX - PDX
1 stop9h 38mFrontier
Deal found 9/10$128
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/112:07 pmPDX - LAX
1 stop6h 48mMultiple Airlines
Fri 10/101:07 pmLAX - PDX
1 stop7h 40mMultiple Airlines
Deal found 9/11$129
This CheapOair deal was found by Cheapflights users on 9/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/267:03 pmPDX - LAX
1 stop18h 43mFrontier
Sun 9/289:44 amLAX - PDX
Nonstop2h 24mFrontier
Deal found 9/11$130
This Priceline deal was found by Cheapflights users on 9/10. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/112:07 pmPDX - LAX
1 stop6h 48mMultiple Airlines
Sat 10/410:14 amLAX - PDX
Nonstop2h 24mMultiple Airlines
Deal found 9/10$131
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/101:21 pmPDX - LAX
Nonstop2h 26mFrontier
Fri 11/149:51 amLAX - PDX
Nonstop2h 32mFrontier
Deal found 9/10$132
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/21:18 pmPDX - LAX
Nonstop2h 26mFrontier
Fri 11/79:51 amLAX - PDX
Nonstop2h 32mFrontier
Deal found 9/10$133
This Frontier deal was found by Cheapflights users on 9/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/61:21 pmPDX - LAX
Nonstop2h 26mFrontier
Sun 11/99:51 amLAX - PDX
Nonstop2h 32mFrontier
Deal found 9/11$134
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/197:03 pmPDX - LAX
1 stop18h 43mMultiple Airlines
Wed 10/16:15 amLAX - PDX
1 stop4h 56mMultiple Airlines
Deal found 9/11$136

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portland to Riverside 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 11, 2025.
Use the filters below to find and compare flights from Portland to Riverside that are best for you.

Fly from

Portland

Fly to

Riverside

Route

Depart

Return

Price

PortlandLos Angeles

PDX - LAX

PDXLAX

Portland

Tue 10/14

6:15 am-10:35 am

1 stop4h 20m

Los Angeles

Tue 10/21

5:15 pm-10:40 pm

1 stop5h 25m

$124

PortlandLos Angeles

PDX - LAX

PDXLAX

Portland

Wed 11/12

7:00 am-12:11 pm

1 stop5h 11m

Los Angeles

Wed 11/12

2:18 pm-4:50 pm

Nonstop2h 32m

$129

PortlandLos Angeles

PDX - LAX

PDXLAX

Portland

Tue 10/28

5:10 am-10:40 am

1 stop5h 30m

Los Angeles

Tue 10/28

6:20 pm-10:15 pm

1 stop3h 55m

$134

PortlandLos Angeles

PDX - LAX

PDXLAX

Portland

Thu 11/6

1:21 pm-3:47 pm

Nonstop2h 26m

Los Angeles

Mon 11/10

10:21 am-7:59 pm

1 stop9h 38m

$139

PortlandLos Angeles

PDX - LAX

PDXLAX

Portland

Wed 10/15

12:43 pm-12:25 am

1 stop11h 42m

Los Angeles

Sat 10/18

10:46 am-1:06 pm

Nonstop2h 20m

$142

PortlandLos Angeles

PDX - LAX

PDXLAX

Portland

Wed 10/15

10:45 am-4:35 pm

1 stop5h 50m

Los Angeles

Sat 10/18

5:10 pm-10:15 pm

1 stop5h 05m

$142

PortlandLos Angeles

PDX - LAX

PDXLAX

Portland

Sat 11/1

1:21 pm-3:47 pm

Nonstop2h 26m

Los Angeles

Mon 11/3

10:21 am-7:59 pm

1 stop9h 38m

$144

PortlandLos Angeles

PDX - LAX

PDXLAX

Portland

Tue 10/28

12:52 pm-12:25 am

1 stop11h 33m

Los Angeles

Mon 11/3

3:25 pm-11:56 am

1 stop20h 31m

$144

PortlandLos Angeles

PDX - LAX

PDXLAX

Portland

Sun 11/2

1:18 pm-3:44 pm

Nonstop2h 26m

Los Angeles

Mon 11/3

10:21 am-7:59 pm

1 stop9h 38m

$144

PortlandLos Angeles

PDX - LAX

PDXLAX

Portland

Fri 10/31

1:21 pm-3:47 pm

Nonstop2h 26m

Los Angeles

Sun 11/2

9:51 am-12:23 pm

Nonstop2h 32m

$147

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 21 results
1
2
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Best time to book a flight from Portland to Riverside

Have a flexible travel schedule? Discover the best time to fly to Riverside from Portland 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 Portland to Riverside

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

Use this chart to determine the optimal time to book a round-trip flight from Portland to Riverside. Price data was last updated on August 29, 2025.

To ensure you get the cheapest price possible for a flight from Portland to Riverside, you should look to book at least 57 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, January is the cheapest month in which you can book a flight from Portland to Riverside (average of $246). Flying from Portland to Riverside in March is currently the most expensive (average of $325). 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 PDX to R1V?

Find hourly flight availability from Portland to Riverside. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

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

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

Use this chart to determine the cheapest time to fly round-trip from Portland to Riverside. Price data was last updated on September 7, 2025.

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

Weekly flight availability from Portland to Riverside

Explore weekly flight availability from Portland to Riverside. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 11, 2025.

The most flights from PDX to R1V are scheduled on a Thursday (85 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (40 on average).

Reviews of airlines servicing Riverside

Get insights into the airlines that provide service to Riverside. 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 Riverside. Reviews last updated September 11, 2025.
Read reviews from past customers who have flown Alaska Airlines, Delta, and American Airlines from Portland to Riverside. 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Overall

8.0

Comfort

7.8

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Overall

8.0

Comfort

7.8

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Delta
8.0
Very good
7,960 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Overall

8.0

Comfort

7.8

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Overall

8.0

Comfort

7.8

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Spirit Airlines
6.3
Okay
8,023 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Overall

8.0

Comfort

7.8

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Frontier
5.8
Fair
3,177 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Overall

8.0

Comfort

7.8

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

Find useful and relevant information for your journey from Portland to Riverside. 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 from for flights from Portland to Riverside?

    If you book a flight to Riverside from Portland, you will be flying from Portland, which is the city’s only airport. Portland (PDX) is located 6.0 mi from the center of Portland. There are 52 flights from Portland to Riverside per day from 8 different airlines.

  • How popular is this Portland to Riverside flight route?

    Flights from Portland to Riverside have been viewed 195 times in the past calendar month.

  • How long is the flight from Portland to Riverside?

    There are many flights that can get you from Portland to Riverside in 2h 26m. Fly via Southwest, Alaska Airlines, or Frontier to get the fastest option. There are 834 mi between Portland and Riverside. Both multi-stop and nonstop flights can be found to your destination and back.

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

    For one-way options, check prices for Southwest. According to our data, you can fly for as low as $81. Users have also found prices from $84 and $84 on United Airlines and Frontier, respectively.

  • What are the most reliable airlines from Portland to Riverside?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Portland to Riverside on time: China Eastern (98%), Aeromexico (95%), Japan Airlines (93%).

  • What are the cheapest flights from Portland to Riverside?

    While on average a flight from Portland to Riverside is generally $852, our data shows the cheapest flight currently is $80. When looking at the most popular route, (Portland - Los Angeles), you can expect to pay $119 for that flight.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Portland to Riverside (average of $246). Flying from Portland to Riverside in March is currently the most expensive (average of $325). 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.

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Top 8 airlines flying from Portland to Riverside

Discover the top 8 airlines that operate flights from Portland to Riverside. 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 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$32Average$152FlexibilityNo cancel feeOn-time65%
FrontierCheapest$54Average$140FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$89Average$250FlexibilityNo cancel feeOn-time85%
DeltaCheapest$93Average$281FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$143Average$310FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$147Average$275FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$158Average$301FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$158Average$342FlexibilityNo cancel feeOn-time69%

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