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Cheap flights from Portland to Los Angeles from $88

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to Los Angeles departing on 1/24. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

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Frontier Logo
12:51 pm - 2:25 pmPDX-ONT
25h 34m1 stop
Frontier Logo
5:18 pm - 8:36 amONT-PDX
15h 18m1 stop
$125Frontier
Find Deal
Thu, Dec 11 - Sun, Dec 14
Frontier Logo
12:51 pm - 2:25 pmPDX-ONT
25h 34m1 stop
Frontier Logo
3:20 pm - 11:56 amONT-PDX
20h 36m1 stop
$128Frontier
Find Deal
Thu, Dec 4 - Sat, Dec 13
Frontier Logo
12:51 pm - 2:25 pmPDX-ONT
25h 34m1 stop
Frontier Logo
3:20 pm - 11:56 amONT-PDX
20h 36m1 stop
$129Frontier
Find Deal
Thu, Dec 11 - Sat, Dec 13
Frontier Logo
12:55 pm - 2:25 pmPDX-ONT
25h 30m1 stop
Frontier Logo
5:18 pm - 8:36 amONT-PDX
15h 18m1 stop
$138Frontier
Find Deal
Fri, Dec 12 - Sun, Dec 14
Frontier Logo
12:55 pm - 2:25 pmPDX-ONT
25h 30m1 stop
Frontier Logo
5:18 pm - 8:36 amONT-PDX
15h 18m1 stop
$142Frontier
Find Deal
Fri, Dec 12 - Sun, Dec 14
Frontier Logo
12:47 pm - 11:59 pmPDX-ONT
11h 12m1 stop
Frontier Logo
6:00 am - 1:24 pmONT-PDX
7h 24m1 stop
$144Frontier
Find Deal
Thu, Dec 18 - Tue, Dec 23
Frontier Logo
10:06 am - 2:26 pmPDX-ONT
4h 20m1 stop
Frontier Logo
12:29 pm - 3:04 pmONT-PDX
2h 35mnonstop
$146Frontier
Find Deal
Tue, Nov 25 - Mon, Dec 1
Frontier Logo
2:29 pm - 5:15 pmPDX-ONT
26h 46m1 stop
Frontier Logo
6:00 am - 1:24 pmONT-PDX
7h 24m1 stop
$149Frontier
Find Deal
Tue, Dec 23 - Tue, Dec 30
Frontier Logo
10:06 am - 2:26 pmPDX-ONT
4h 20m1 stop
Frontier Logo
12:29 pm - 3:04 pmONT-PDX
2h 35mnonstop
$152Frontier
Find Deal
Tue, Nov 25 - Wed, Nov 26
Frontier Logo
3:59 pm - 11:57 pmPDX-ONT
7h 58m1 stop
Frontier Logo
12:29 pm - 3:04 pmONT-PDX
2h 35mnonstop
$156Frontier
Find Deal
Sun, Nov 23 - Wed, Nov 26

Frontier flights from Portland to Ontario

Our best Frontier deals on Portland to Ontario flight tickets
Frontier
Dec 11
PDX12:51 pmPortland
25h 34m
1 stop
ONT2:25 pmOntario
Dec 14
ONT5:18 pmOntario
15h 18m
1 stop
PDX8:36 amPortland
$125
Find similar
Frontier
Dec 4
PDX12:51 pmPortland
25h 34m
1 stop
ONT2:25 pmOntario
Dec 13
ONT3:20 pmOntario
20h 36m
1 stop
PDX11:56 amPortland
$128
Find similar
Frontier
Dec 11
PDX12:51 pmPortland
25h 34m
1 stop
ONT2:25 pmOntario
Dec 13
ONT3:20 pmOntario
20h 36m
1 stop
PDX11:56 amPortland
$129
Find similar

Alaska Airlines flights from Portland to Ontario

Our best Alaska Airlines deals on Portland to Ontario flight tickets
Alaska Airlines
Dec 6
PDX5:45 pmPortland
2h 18m
ONT8:03 pmOntario
Dec 10
ONT7:10 amOntario
2h 31m
PDX9:41 amPortland
$157
Find similar
Alaska Airlines
Dec 3
PDX5:45 pmPortland
2h 18m
ONT8:03 pmOntario
Dec 10
ONT6:00 amOntario
4h 50m
1 stop
PDX10:50 amPortland
$165
Find similar
Alaska Airlines
Jan 31
PDX2:43 pmPortland
2h 20m
ONT5:03 pmOntario
Feb 1
ONT7:00 amOntario
2h 33m
PDX9:33 amPortland
$167
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Portland to Ontario 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, momondo users made 832,500 searches. Data last updated November 13, 2025.
Use the filters below to find and compare flights from Portland to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 12/11

12:51 pm-2:25 pm

1 stop25h 34m

Ontario

Sun 12/14

5:18 pm-8:36 am

1 stop15h 18m

$125

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 12/4

12:51 pm-2:25 pm

1 stop25h 34m

Ontario

Sat 12/13

3:20 pm-11:56 am

1 stop20h 36m

$128

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 12/11

12:51 pm-2:25 pm

1 stop25h 34m

Ontario

Sat 12/13

3:20 pm-11:56 am

1 stop20h 36m

$129

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 12/12

12:55 pm-2:25 pm

1 stop25h 30m

Ontario

Sun 12/14

5:18 pm-8:36 am

1 stop15h 18m

$138

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 12/12

12:55 pm-2:25 pm

1 stop25h 30m

Ontario

Sun 12/14

5:18 pm-8:36 am

1 stop15h 18m

$142

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 12/18

12:47 pm-11:59 pm

1 stop11h 12m

Ontario

Tue 12/23

6:00 am-1:24 pm

1 stop7h 24m

$144

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 11/25

10:06 am-2:26 pm

1 stop4h 20m

Ontario

Mon 12/1

12:29 pm-3:04 pm

Nonstop2h 35m

$146

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 12/23

2:29 pm-5:15 pm

1 stop26h 46m

Ontario

Tue 12/30

6:00 am-1:24 pm

1 stop7h 24m

$149

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 11/25

10:06 am-2:26 pm

1 stop4h 20m

Ontario

Wed 11/26

12:29 pm-3:04 pm

Nonstop2h 35m

$152

PortlandOntario

PDX - ONT

PDXONT

Portland

Sun 11/23

3:59 pm-11:57 pm

1 stop7h 58m

Ontario

Wed 11/26

12:29 pm-3:04 pm

Nonstop2h 35m

$156

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from Portland to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Ontario?

In general, July is the cheapest month to fly from Portland to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $168. If you aren’t able to travel during the month of July, then book flights to Ontario from Portland during August instead. Flights to Ontario in August, while not as cheap as those in July, still average around $172.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Friday when prices can be found for as low as $176. This is often the case because there is less demand to fly during this day of the week. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from Portland to Ontario for around $286.

What is the cheapest time of day to depart on your flight to Ontario?

In the morning is the cheapest time of day to fly from Portland to Ontario when you can find flight prices for as low as $181. Flying to Ontario in the morning is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $283 on average. Flights to Ontario from Portland in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Portland to Ontario flight route?

Fly from Portland to Ontario for the best Portland - Ontario flight prices

How far in advance should I book a flight to Ontario?

You are more likely to see cheaper flights to Ontario from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $230 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Portland for as low as $154 on momondo.

What cabin class options are available on Portland to Ontario flights?

There are 3 cabin classes available to choose from on Portland to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Portland to Ontario flight prices changed over time?

As of November 2025, prices for Portland to Ontario flights are approximately 31% cheaper when compared to flights at the same time last year.

When to book flights from Portland to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Portland to Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Portland to Ontario (PDX to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland to Ontario

Best Price Found

$117

Fastest flight time

2h 16m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Portland in the past 72 hours is $117. The best round-trip flight deal from Portland to Ontario found on momondo in the last 72 hours is $177.
The fastest flight from Portland to Ontario takes 2h 16m
Direct flights go from Portland to Ontario every day.
There is 1 airport near Ontario: Ontario (ONT)
Search flight deals

  • How far is Portland to Ontario by plane?

    The straight-line distance from Portland to Ontario is 834.5 mi. By plane, this route typically takes 2h 18m.

  • When did momondo last update prices for flights from Portland Airport to Ontario Airport?

    Prices for flights from Portland Airport to Ontario Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Portland Airport to Ontario Airport?

  • How old do you have to be to fly from Portland Airport to Ontario Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to Ontario Airport.

  • What documentation or ID do you need to fly to Ontario Airport?

    The travel and health documents required for your trip to Ontario Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Portland to Ontario?

  • What is the most popular airline from Portland to Ontario?

Best airlines flying from Portland to Ontario

Compare and see reviews for airlines that fly from Portland to Ontario with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $64Free CancellationRating
5.8
3,114 reviews
Search Frontier flights
DeltaPriceFrom $93Free CancellationRating
7.9
8,007 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $98Free CancellationRating
7.8
2,809 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $158Free CancellationRating
7.4
9,015 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $167Free CancellationRating
8.0
11,281 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $173Free CancellationRating
8.0
4,236 reviews
Search Southwest flights

  • Alaska Airlines Flights From Portland to Ontario

    Alaska Airlines flies from Portland to Ontario around 18 times per week, with 11,281 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Portland to Ontario in the last 72 hours was $167 (round-trip), much lower than the average airfare cost of $301 for Alaska Airlines flights on this route.

  • Hawaiian Airlines Flights From Portland to Ontario

    Hawaiian Airlines (7.8/10 from 2,809 reviews) operates around 18 flights from Portland to Ontario in any given week. The average Hawaiian Airlines airfare for this route is around $238, with deals from around $98 rare but found on momondo. Referenced prices are for round-trip Portland to Ontario flight searches in the last 72 hours.

Why use momondo?

Why should I use momondo to find a flight deal from Portland to Ontario?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Portland to Ontario for you.

Can I find flights from Portland to Ontario with flexible booking policies on momondo?

All flight searches from Portland to Ontario on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Portland to Ontario?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Portland to Ontario.

I’m not ready to book a flight from Portland to Ontario right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Portland to Ontario flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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