$100 Cheap Delta flights Ontario (ONT) to Seattle (SEA)

View $100 flight on Sun, Feb 1, 2026Opens in a new window

$100 Cheap Delta flights Ontario (ONT) to Seattle (SEA)

Prices were available within the past 7 days and start at $100 for one-way flights and $157 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, May 12 - Sat, May 16
ONT
Ontario
SEA
Seattle
$157 Roundtrip, found 9 hours ago
$157
Roundtrip
found 9 hours ago
Select Delta flight, departing Tue, May 12 from Ontario to Seattle, returning Sat, May 16, priced at $157 found 9 hours ago

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

November is typically the cheapest month to fly

From $79 - $214 per traveler.
Flights from Ontario (ONT) to Seattle (SEA)
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, Delta
Popular airline
Delta
Distance
1530 km
Average flight time
2 hours 57 mins