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Cheap flights from Portland to Los Angeles from $84

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 2/18. 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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Find the cheapest flights from Portland to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Alaska Airlines Logo
9:30 pm - 11:52 pm
PDX
-
ONT
2h 22mnonstop
Alaska Airlines Logo
7:00 am - 9:28 am
ONT
-
PDX
2h 28mnonstop
$157Alaska Airlines
Sun, Mar 15 - Sat, Apr 4
Alaska Airlines Logo
9:30 pm - 11:52 pm
PDX
-
ONT
2h 22mnonstop
Alaska Airlines Logo
7:00 am - 9:28 am
ONT
-
PDX
2h 28mnonstop
$159Alaska Airlines
Tue, Mar 10 - Sat, Mar 14
Frontier Logo
9:22 pm - 1:37 pm
PDX
-
ONT
16h 15m
1 stop
Frontier Logo
3:07 pm - 10:33 am
ONT
-
PDX
19h 26m
1 stop
$161Frontier
Mon, Feb 2 - Wed, Feb 4
Southwest Logo
6:30 am - 10:25 am
PDX
-
ONT
3h 55m
1 stop
Southwest Logo
6:25 am - 10:15 am
ONT
-
PDX
3h 50m
1 stop
$163Southwest
Wed, Apr 1 - Mon, Apr 6
Southwest Logo
12:30 pm - 4:25 pm
PDX
-
ONT
3h 55m
1 stop
Southwest Logo
4:40 pm - 9:10 pm
ONT
-
PDX
4h 30m
1 stop
$167Southwest
Wed, Feb 18 - Mon, Feb 23
Southwest Logo
6:30 am - 10:25 am
PDX
-
ONT
3h 55m
1 stop
Southwest Logo
4:25 pm - 11:35 pm
ONT
-
PDX
7h 10m
2 stops
$168Southwest
Wed, Apr 1 - Wed, Apr 1
Southwest Logo
6:00 am - 12:10 pm
PDX
-
ONT
6h 10m
1 stop
Southwest Logo
9:00 am - 5:25 pm
ONT
-
PDX
8h 25m
2 stops
$172Southwest
Fri, Feb 20 - Sat, Feb 28
Frontier Logo
9:22 pm - 1:52 pm
PDX
-
ONT
16h 30m
1 stop
Frontier Logo
10:03 pm - 8:58 am
ONT
-
PDX
10h 55m
1 stop
$175Frontier
Mon, Feb 9 - Wed, Mar 25
Alaska Airlines Logo
5:58 pm - 8:23 pm
PDX
-
ONT
2h 25mnonstop
Alaska Airlines Logo
5:49 pm - 8:16 pm
ONT
-
PDX
2h 27mnonstop
$177Alaska Airlines
Sat, Apr 4 - Fri, Apr 10
Southwest Logo
2:25 pm - 9:05 pm
PDX
-
ONT
6h 40m
2 stops
Southwest Logo
4:25 pm - 10:25 pm
ONT
-
PDX
6h 00m
2 stops
$178Southwest
Tue, Mar 3 - Mon, Mar 9

Frontier flights from Portland to Ontario

Our best Frontier deals on Portland to Ontario flight tickets
Frontier
Feb 2
PDX9:22 pmPortland
16h 15m
1 stop
ONT1:37 pmOntario
Feb 7
ONT7:35 pmOntario
14h 39m
1 stop
PDX10:14 amPortland
$161
Frontier
Feb 2
PDX9:22 pmPortland
16h 15m
1 stop
ONT1:37 pmOntario
Feb 4
ONT3:07 pmOntario
19h 26m
1 stop
PDX10:33 amPortland
$171
Frontier
Feb 9
PDX9:22 pmPortland
16h 30m
1 stop
ONT1:52 pmOntario
Mar 25
ONT10:03 pmOntario
10h 55m
1 stop
PDX8:58 amPortland
$175

United Airlines flights from Portland to Ontario

Our best United Airlines deals on Portland to Ontario flight tickets
United Airlines
Feb 18
PDX5:05 amPortland
7h 38m
1 stop
ONT12:43 pmOntario
Feb 22
ONT6:09 amOntario
6h 29m
1 stop
PDX12:38 pmPortland
$219
United Airlines
Feb 19
PDX7:30 amPortland
5h 08m
1 stop
ONT12:38 pmOntario
Feb 19
ONT6:37 pmOntario
4h 22m
1 stop
PDX10:59 pmPortland
$237
United Airlines
Jan 22
PDX1:35 pmPortland
4h 08m
1 stop
ONT5:43 pmOntario
Jan 25
ONT6:39 pmOntario
6h 00m
1 stop
PDX12:39 amPortland
$317

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 January 21, 2026.
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

Sun 3/15

9:30 pm-11:52 pm

Nonstop2h 22m

Ontario

Sat 4/4

7:00 am-9:28 am

Nonstop2h 28m

$157

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 3/10

9:30 pm-11:52 pm

Nonstop2h 22m

Ontario

Sat 3/14

7:00 am-9:28 am

Nonstop2h 28m

$159

PortlandOntario

PDX - ONT

PDXONT

Portland

Mon 2/2

9:22 pm-1:37 pm

1 stop16h 15m

Ontario

Wed 2/4

3:07 pm-10:33 am

1 stop19h 26m

$161

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 4/1

6:30 am-10:25 am

1 stop3h 55m

Ontario

Mon 4/6

6:25 am-10:15 am

1 stop3h 50m

$163

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 2/18

12:30 pm-4:25 pm

1 stop3h 55m

Ontario

Mon 2/23

4:40 pm-9:10 pm

1 stop4h 30m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 4/1

6:30 am-10:25 am

1 stop3h 55m

Ontario

Wed 4/1

4:25 pm-11:35 pm

2 stops7h 10m

$168

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 2/20

6:00 am-12:10 pm

1 stop6h 10m

Ontario

Sat 2/28

9:00 am-5:25 pm

2 stops8h 25m

$172

PortlandOntario

PDX - ONT

PDXONT

Portland

Mon 2/9

9:22 pm-1:52 pm

1 stop16h 30m

Ontario

Wed 3/25

10:03 pm-8:58 am

1 stop10h 55m

$175

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 4/4

5:58 pm-8:23 pm

Nonstop2h 25m

Ontario

Fri 4/10

5:49 pm-8:16 pm

Nonstop2h 27m

$177

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 3/3

2:25 pm-9:05 pm

2 stops6h 40m

Ontario

Mon 3/9

4:25 pm-10:25 pm

2 stops6h 00m

$178

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest 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 $185. 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 $293.

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 $183. 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 $307 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 $231 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 $169 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.

Can stopping save me money on Portland to Ontario flights?

No. A direct flight is the cheapest option for a flight between Portland to Ontario.

How have Portland to Ontario flight prices changed over time?

As of January 2026, prices for Portland to Ontario flights are approximately 142% more expensive 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

$188

Fastest flight time

2h 18m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Portland in the past 72 hours is $188. The best round-trip flight deal from Portland to Ontario found on momondo in the last 72 hours is $171.
The fastest flight from Portland to Ontario takes 2h 18m
Direct flights go from Portland to Ontario every day.
There is 1 airport in Ontario. From Portland there are direct flights to 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 $53Free CancellationRating
5.7
3,057 reviews
Search Frontier flights
DeltaPriceFrom $83Free CancellationRating
7.9
8,088 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $88Free CancellationRating
7.8
2,829 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $142Free CancellationRating
7.4
9,191 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $157Free CancellationRating
8.0
11,775 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $173Free CancellationRating
8.0
4,266 reviews
Search Southwest flights

  • Alaska Airlines Flights From Portland to Ontario

    Alaska Airlines flies from Portland to Ontario around 22 times per week, with 11,775 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Portland to Ontario in the last 72 hours was $157 (round-trip), much lower than the average airfare cost of $293 for Alaska Airlines flights on this route.

  • Hawaiian Airlines Flights From Portland to Ontario

    Hawaiian Airlines (7.8/10 from 2,829 reviews) operates around 22 flights from Portland to Ontario in any given week. The average Hawaiian Airlines airfare for this route is around $218, with deals from around $88 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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