Book Cheap Delta flight from Seattle (SEA) to Ontario Intl. Airport (ONT) from CA $279

Find The Best Day to Book a Cheap Delta Flights From Seattle to Ontario Intl. Airport

Cheapest Delta Flights from Seattle (SEA) to Ontario Intl. Airport (ONT)

The cheapest flights to Ontario Intl. Airport found within the past 7 days were CA $491 round trip and CA $279 one way. Prices and availability subject to change. Additional terms may apply.

Frequently asked questions

Can I catch a flight from Sea-Tac Airport to ONT right now?
It's always wise to learn about any quarantine requirements and travel advice reports in place in your destination city. Ensure you go to the Covid-19 Travel Advisor for up-to-date information on flying to Ontario Airport.
What terminal is Delta Air Lines at Sea-Tac Airport?
While it's hard to say exactly which terminal your Delta Air Lines flight from Seattle - Tacoma Intl. Airport (SEA) to Ontario Airport will set off from, we can tell you that you're likely to be exiting the plane at terminal 2.
Are there Delta Air Lines non-stop flights from SEA to ONT?
You bet. Save time and jet straight from Sea-Tac Airport to Ontario Airport with Delta Air Lines. Avoid long layovers, reduce the risk of losing your belongings and reach your destination faster — direct flights are the preferred way to travel for many wise wanderers.
How long is a Delta Air Lines flight from SEA to ONT?
No jet lag, no sore legs — there's a great deal to love about short flights. If you're traveling with Delta Air Lines from SEA to ONT, the trip will fly by in about 3 hours and 17 minutes.
What type of aircraft does Delta Air Lines fly from SEA to ONT?
The Embraer 175 is usually used by Delta Air Lines between SEA and ONT. Browse through your in-flight magazine in your seat pocket if you want to find out more information.
How many direct and indirect flights does Delta Air Lines fly from SEA to ONT?
If you're considering a jaunt from SEA to ONT, you can pick from at least 3 Delta Air Lines flights every day.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to Ontario Airport, please visit our Customer Service Portal.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

Grab a great Delta flight from SEA to ONT 

To find a great deal on Delta flights with Travelocity, simply enter your origin and destination airports, pick your travel dates, and hit search. From here, you can sort by price, flight duration, and arrival/departure time. You can also filter to find nonstop flights. 

Flying Delta Seattle to Los Angeles gives you fights to choose from. With that direct flight time of , you’ll be touching down before you know it.  

 

Find cheap flights with Delta between Seattle and Los Angeles 

Delta has a range of great fares on stacks of flights, and to find the most affordable for you, there are a few tricks you can try. Booking in advance, for example, is a great way to grab a fantastic deal. Also, choose the cheapest month, if you can. One-way flights from Seattle to Los Angeles with Delta are July.  

The more flexible you are, the more affordable flights you’re likely to find. Consider one-way flights and connecting flights, as well as standard roundtrip and direct options. Even if you’re flying today, cheap last-minute flights are easy to find by entering your travel dates and hitting search.  

 

Reasons to book your Delta flights with Travelocity 

Travelocity makes it easy to book a seat, anywhere in the world. The vast inventory, fast search, and advanced filters put some of the best deals on the planet in one place. Whether you’re traveling on business, with friends, family, or on your own, take your pick from some fantastic options. And with free cancellation and pay later options, you can travel more and worry less.  

Delta Airports
Hop on a(n) Delta flight today by flying to many destinations out of these domestic and international airports:
Airport code
Country
Airport name
Number of flights
ATLUSAHartsfield-Jackson Atlanta Intl.252
DTWUSADetroit Metropolitan Wayne County156
MSPUSAMinneapolis - St. Paul Intl.131
SLCUSASalt Lake City Intl.116
SEAUSASeattle - Tacoma Intl.57
LAXUSALos Angeles Intl.41
AMSNLDSchiphol31
YYCCANCalgary Intl.26
YYZCANPearson Intl.24
JFKUSAJohn F. Kennedy Intl.23

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La Quinta Inn & Suites by Wyndham Ontario Airport

La Quinta Inn & Suites by Wyndham Ontario Airport

3 out of 5
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Book a stay at this business-friendly hotel in Ontario. Enjoy free breakfast, free WiFi, and free parking. Our guests praise the breakfast and the helpful staff ...
8.2/10 Very Good! (2,292 reviews)
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Reviewed on May 22, 2026

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DoubleTree by Hilton Ontario Airport

DoubleTree by Hilton Ontario Airport

4 out of 5
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Book a stay at this business-friendly hotel in Ontario. Enjoy free WiFi, 2 restaurants, and a nightclub. Our guests praise the helpful staff and the clean rooms ...
8.4/10 Very Good! (1,001 reviews)
"We stayed here while attending my daughter’s university graduation. We booked a family suite with two bedrooms. The rooms were clean, beds comfortable and linens average. The pool and spa area was lovely along with a small gym. There is a bar, steak house and Starbucks counter for food and beverage ..."

Reviewed on May 20, 2026

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Residence Inn by Marriott Ontario Airport

Residence Inn by Marriott Ontario Airport

3 out of 5
2025 Convention Center Way Ontario CA
Stay at this hotel in Ontario. Enjoy free breakfast, free WiFi, and a fitness center. Our guests praise the helpful staff and the clean rooms in our reviews. ...
7.4/10 Good! (1,000 reviews)
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Reviewed on May 20, 2026

Residence Inn by Marriott Ontario Airport
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.

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*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.