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

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

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

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
Sun, May 24 - Tue, Jun 9
SEA
Seattle
ONT
Ontario
$177 Roundtrip, found 5 hours ago
$177
Roundtrip
found 5 hours ago
Select Delta flight, departing Sun, May 24 from Seattle to Ontario, returning Tue, Jun 9, priced at $177 found 5 hours ago
Delta
Wed, Apr 29 - Tue, May 19
SEA
Seattle
ONT
Ontario
$197 Roundtrip, found 6 days ago
$197
Roundtrip
found 6 days ago
Select Delta flight, departing Wed, Apr 29 from Seattle to Ontario, returning Tue, May 19, priced at $197 found 6 days ago

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 $170
ONT
Los Angeles - Ontario Intl.
CheapestClosest
Average driving time to city center8 min
Flights from $170

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

October is typically the cheapest month to fly

From $79 - $159 per traveler.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, Delta, Frontier Airlines, United
Popular airline
Frontier Airlines
Distance
1530 km
Average flight time
2 hours 53 mins

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