$109 Cheap Delta flights Ontario (ONT) to Seattle (SEA)

View $109 flight on Tue, Jun 9, 2026Opens in a new window

$109 Cheap Delta flights Ontario (ONT) to Seattle (SEA)

Prices were available within the past 7 days and start at $109 for one-way flights and $177 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, May 6 - Mon, May 25
ONT
Ontario
SEA
Seattle
$177 Roundtrip, found 19 hours ago
$177
Roundtrip
found 19 hours ago
Select Delta flight, departing Wed, May 6 from Ontario to Seattle, returning Mon, May 25, priced at $177 found 19 hours ago
Delta
Sat, Apr 18 - Thu, May 7
ONT
Ontario
SEA
Seattle
$297 Roundtrip, found 19 hours ago
$297
Roundtrip
found 19 hours ago
Select Delta flight, departing Sat, Apr 18 from Ontario to Seattle, returning Thu, May 7, priced at $297 found 19 hours ago
Delta
Fri, May 29 - Mon, Jun 1
ONT
Ontario
SEA
Seattle
$303 Roundtrip, found 3 days ago
$303
Roundtrip
found 3 days ago
Select Delta flight, departing Fri, May 29 from Ontario to Seattle, returning Mon, Jun 1, priced at $303 found 3 days ago

Alternative airports near Seattle

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

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $191
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $191

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

November is typically the cheapest month to fly

From $79 - $250 per traveler.

Travel information

Origin airport
Los Angeles - Ontario Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Popular airline
Delta
Distance
1530 km
Average flight time
3 hours 12 mins

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