NZ$137 Cheap Flights Seattle to Ontario (SEA-ONT)

View NZ$137 flight on Thu, 29 Jan 2026Opens in a new window

Popular airlines from Seattle to Ontario, CA (ONT-Los Angeles - Ontario Intl.)

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Cheap Flights from Seattle (SEA) to Ontario (ONT)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sun, 15 Mar - Tue, 31 Mar
SEA
Seattle
ONT
Ontario
NZ$208 Return, found 7 hours ago
NZ$208
Return
found 7 hours ago
Select Delta flight, departing Sun, 15 Mar from Seattle to Ontario, returning Tue, 31 Mar, priced at NZ$208 found 7 hours ago
Hawaiian Airlines
Wed, 18 Mar - Tue, 31 Mar
SEA
Seattle
ONT
Ontario
NZ$208 Return, found 7 hours ago
NZ$208
Return
found 7 hours ago
Select Hawaiian Airlines flight, departing Wed, 18 Mar from Seattle to Ontario, returning Tue, 31 Mar, priced at NZ$208 found 7 hours ago
Hawaiian Airlines
Mon, 2 Mar - Sat, 21 Mar
SEA
Seattle
ONT
Ontario
NZ$240 Return, found 7 hours ago
NZ$240
Return
found 7 hours ago
Select Hawaiian Airlines flight, departing Mon, 2 Mar from Seattle to Ontario, returning Sat, 21 Mar, priced at NZ$240 found 7 hours ago
Hawaiian Airlines
Mon, 2 Feb - Fri, 20 Feb
SEA
Seattle
ONT
Ontario
NZ$293 Return, found 7 hours ago
NZ$293
Return
found 7 hours ago
Select Hawaiian Airlines flight, departing Mon, 2 Feb from Seattle to Ontario, returning Fri, 20 Feb, priced at NZ$293 found 7 hours ago
Delta
Thu, 5 Feb - Sat, 21 Feb
SEA
Seattle
ONT
Ontario
NZ$299 Return, found 3 days ago
NZ$299
Return
found 3 days ago
Select Delta flight, departing Thu, 5 Feb from Seattle to Ontario, returning Sat, 21 Feb, priced at NZ$299 found 3 days ago
Delta
Thu, 12 Feb - Mon, 2 Mar
SEA
Seattle
ONT
Ontario
NZ$307 Return, found 3 days ago
NZ$307
Return
found 3 days ago
Select Delta flight, departing Thu, 12 Feb from Seattle to Ontario, returning Mon, 2 Mar, priced at NZ$307 found 3 days ago
Alaska Airlines
Mon, 9 Mar - Sun, 29 Mar
SEA
Seattle
ONT
Ontario
NZ$345 Return, found 7 hours ago
NZ$345
Return
found 7 hours ago
Select Alaska Airlines flight, departing Mon, 9 Mar from Seattle to Ontario, returning Sun, 29 Mar, priced at NZ$345 found 7 hours ago
Delta
Wed, 14 Jan - Sat, 24 Jan
SEA
Seattle
ONT
Ontario
NZ$381 Return, found 3 days ago
NZ$381
Return
found 3 days ago
Select Delta flight, departing Wed, 14 Jan from Seattle to Ontario, returning Sat, 24 Jan, priced at NZ$381 found 3 days ago
Alaska Airlines
Mon, 2 Feb - Sun, 22 Feb
SEA
Seattle
ONT
Ontario
NZ$389 Return, found 7 hours ago
NZ$389
Return
found 7 hours ago
Select Alaska Airlines flight, departing Mon, 2 Feb from Seattle to Ontario, returning Sun, 22 Feb, priced at NZ$389 found 7 hours ago
Delta
Thu, 8 Jan - Sat, 24 Jan
SEA
Seattle
ONT
Ontario
NZ$428 Return, found 3 days ago
NZ$428
Return
found 3 days ago
Select Delta flight, departing Thu, 8 Jan from Seattle to Ontario, returning Sat, 24 Jan, priced at NZ$428 found 3 days ago
Flight from Seattle to Ontario route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, Delta, Hawaiian Airlines
Return price
NZ$208
Distance
1530 km
Average flight time
2 hours 39 mins

Perfect flights from Seattle to Ontario

Embark on an unforgettable journey without breaking the bank with Expedia's incredible deals on cheap flights from Seattle to Ontario. Whether you're aching for a romantic escape with your partner, craving an adventurous solo expedition, or yearning to immerse yourself in the local history and culture, we've got you covered.
 
Picture yourself strolling through the streets of , surrounded by breathtaking architecture and absorbing the vibrant atmosphere of this captivating city. Indulge in the mouth-watering local specialties, from tantalizing street food to exquisite fine dining. With Expedia, you can experience all of this and more, without sacrificing your budget.
 
Our flexible Seattle - Tacoma Intl. to Los Angeles - Ontario Intl. ticket options cater to your travel preferences, with incredible one-way fares from NZ$137 and roundtrip prices from NZ$208. Whether you're planning a short city break or a longer adventure, our dynamic pricing ensures that you find the best deals for your journey.
 
But the magic doesn't stop there. Expedia offers a range of partner services to enhance your trip. Rent a car at Los Angeles - Ontario Intl. and explore and its surrounding areas at your own pace. Discover hidden gems off the beaten path, and create unforgettable memories. We also provide a handpicked selection of accommodations, from charming bed and breakfasts to luxury hotels, ensuring that you have a comfortable and memorable stay.
 
Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support are designed to make your travel experience seamless and stress-free. So, why wait? Book your to travel arrangements today and embark on the journey of a lifetime in Ontario.

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 NZ$208. 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 cancelled 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 kilometres. 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.

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