₩126,000 Cheap Flights from Seattle (SEA) to Ontario (ONT)

View ₩126,000 flight on Mon, Nov 17, 2025Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT)

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Cheap Flights from Seattle to Ontario (SEA-ONT)

Prices were available within the past 7 days and start at ₩126,000 for one-way flights and ₩195,100 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, Nov 6 - Mon, Nov 10
SEA
Seattle
ONT
Ontario
₩195,100 Roundtrip, found 1 day ago
₩195,100
Roundtrip
found 1 day ago
Select Delta flight, departing Thu, Nov 6 from Seattle to Ontario, returning Mon, Nov 10, priced at ₩195,100 found 1 day ago
Delta
Mon, Nov 3 - Tue, Nov 4
SEA
Seattle
ONT
Ontario
₩251,900 Roundtrip, found 18 hours ago
₩251,900
Roundtrip
found 18 hours ago
Select Delta flight, departing Mon, Nov 3 from Seattle to Ontario, returning Tue, Nov 4, priced at ₩251,900 found 18 hours ago
Delta
Sat, Oct 25 - Mon, Oct 27
SEA
Seattle
ONT
Ontario
₩264,000 Roundtrip, found 3 days ago
₩264,000
Roundtrip
found 3 days ago
Select Delta flight, departing Sat, Oct 25 from Seattle to Ontario, returning Mon, Oct 27, priced at ₩264,000 found 3 days ago
Hawaiian Airlines
Mon, Nov 17 - Thu, Nov 20
SEA
Seattle
ONT
Ontario
₩265,500 Roundtrip, found 13 hours ago
₩265,500
Roundtrip
found 13 hours ago
Select Hawaiian Airlines flight, departing Mon, Nov 17 from Seattle to Ontario, returning Thu, Nov 20, priced at ₩265,500 found 13 hours ago
Hawaiian Airlines
Tue, Oct 28 - Thu, Oct 30
SEA
Seattle
ONT
Ontario
₩304,800 Roundtrip, found 1 day ago
₩304,800
Roundtrip
found 1 day ago
Select Hawaiian Airlines flight, departing Tue, Oct 28 from Seattle to Ontario, returning Thu, Oct 30, priced at ₩304,800 found 1 day ago
Hawaiian Airlines
Mon, Nov 17 - Thu, Nov 20
SEA
Seattle
ONT
Ontario
₩306,000 Roundtrip, found 13 hours ago
₩306,000
Roundtrip
found 13 hours ago
Select Hawaiian Airlines flight, departing Mon, Nov 17 from Seattle to Ontario, returning Thu, Nov 20, priced at ₩306,000 found 13 hours ago
Delta
Tue, Oct 21 - Wed, Dec 10
SEA
Seattle
ONT
Ontario
₩306,300 Roundtrip, found 2 days ago
₩306,300
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Oct 21 from Seattle to Ontario, returning Wed, Dec 10, priced at ₩306,300 found 2 days ago
United
Mon, Nov 17 - Thu, Nov 20
SEA
Seattle
ONT
Ontario
₩313,600 Roundtrip, found 13 hours ago
₩313,600
Roundtrip
found 13 hours ago
Select United flight, departing Mon, Nov 17 from Seattle to Ontario, returning Thu, Nov 20, priced at ₩313,600 found 13 hours ago
Delta
Tue, Oct 28 - Thu, Oct 30
SEA
Seattle
ONT
Ontario
₩319,300 Roundtrip, found 1 day ago
₩319,300
Roundtrip
found 1 day ago
Select Delta flight, departing Tue, Oct 28 from Seattle to Ontario, returning Thu, Oct 30, priced at ₩319,300 found 1 day ago
American Airlines
Tue, Oct 21 - Wed, Dec 10
SEA
Seattle
ONT
Ontario
₩369,600 Roundtrip, found 2 days ago
₩369,600
Roundtrip
found 2 days ago
Select American Airlines flight, departing Tue, Oct 21 from Seattle to Ontario, returning Wed, Dec 10, priced at ₩369,600 found 2 days ago

Find the cheapest month to fly from Seattle (SEA) to Ontario (ONT)

November is typically the cheapest month to fly

From ₩110,864 - ₩324,293 per traveler.

Alternative airports near Ontario

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Los Angeles - Ontario Intl. ONT. Cheapest and Closest option available. Average driving time to city center is 8 minutes. Flights from ₩389,300
ONT
Los Angeles - Ontario Intl.
CheapestClosest
Average driving time to city center8 min
Flights from ₩389,300

Frequently asked questions

How much is a flight from Seattle - Tacoma Intl. Airport (SEA) to ONT?
Based on airfares available within the last 7 days on Expedia for flights departing within the next year, round-trip flights between Sea-Tac Airport and Los Angeles - Ontario Intl. Airport (ONT) start from ₩195,100. Make your booking ASAP to score the best price for your big adventure. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from SEA to Los Angeles - Ontario Intl. Airport (ONT)?
The majority of flights can be canceled online, but every airline has its own set of terms and conditions. If you do need to cancel your flight, check out our Customer Service Portal and follow the instructions.
How do I find cheap flights from SEA to Los Angeles - Ontario Intl. Airport (ONT) that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT) flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Sea-Tac Airport to ONT?
The flying distance between Sea-Tac Airport and Los Angeles - Ontario Intl. Airport (ONT) is 1,550 kilometers. Close your eyes or get stuck into a book and the journey will zip on by.
Which airlines fly direct from Sea-Tac Airport to Ontario Airport?
One airline that services the route from Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT) is Alaska Airlines (AS). It offers 117 flights every month. Another carrier servicing this route is Delta Air Lines (DL). You'll have 86 flights each month to select from.
Are SEA to ONT flight tickets cheaper when they're purchased at the last minute?
It is possible to nab a fantastic last-minute deal from SEA to Ontario Airport, but it can also be hit-or-miss. As many airlines release prices up to a year in advance, it's worthwhile keeping an eye on fares early and being ready to book when you see a bargain. Expedia compares carrier prices and updates flight deals often, so you can rest easy knowing you're always getting the latest offers.

Travel information

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Delta, United
Roundtrip price
₩195,100
Distance
1530 km
Average flight time
2 hours 45 mins

Book with confidence

Book with confidence

Seattle to Los Angeles Flights

Sometimes you just need to get out of town or maybe you’re looking for a change of scenery. Regardless of the reason, a flight from Seattle to Los Angeles will do just the trick! Go on, plan to see all the famous landmarks and eat your weight in the local cuisine. Your trip is beckoning, so answer the call by packing your suitcase and filling your travel itinerary with exploring Los Angeles.

Whether you’re flying for business or jet-setting on your personal time, you’ve come to the right place. Here at Expedia.com, we’ll pair you up with SEA to ONT flights that won’t make your bank account wince. Ready to temporarily leave behind Seattle for new horizons? Browse through our cheap airfare, and filter by flight times and dates until you find just what you had in mind. From flights without layovers to ones that arrive early in the morning, you’ll come across plane tickets that suit your travel preferences. You can even bundle your flight to ONT with hotels and car rentals to score even bigger savings.

All set to hit the clouds? Book your travel arrangements with us today and have left-over money to put toward your travel outings and adventures.

Seattle to Los Angeles Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

Ontario nearby Airports

Burbank

Seattle to Hollywood Burbank
₩262,600

Orange County

Seattle to John Wayne
₩306,300

Los Angeles

*Available to Expedia members.