$90 Cheap Delta flights Seattle (SEA) to Ontario (ONT)

View $90 flight on Thu, Jan 29, 2026Opens in a new window

$90 Cheap Delta flights Seattle (SEA) to Ontario (ONT)

Prices were available within the past 7 days and start at $90 for one-way flights and $149 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, Jan 29 - Sun, Feb 1
SEA
Seattle
ONT
Ontario
$149 Roundtrip, found 19 hours ago
$149
Roundtrip
found 19 hours ago
Select Delta flight, departing Thu, Jan 29 from Seattle to Ontario, returning Sun, Feb 1, priced at $149 found 19 hours ago
Delta
Thu, Jan 29 - Sun, Feb 1
SEA
Seattle
ONT
Ontario
$159 Roundtrip, found 19 hours ago
$159
Roundtrip
found 19 hours ago
Select Delta flight, departing Thu, Jan 29 from Seattle to Ontario, returning Sun, Feb 1, priced at $159 found 19 hours ago
Delta
Thu, Jan 29 - Sun, Feb 1
SEA
Seattle
ONT
Ontario
$169 Roundtrip, found 19 hours ago
$169
Roundtrip
found 19 hours ago
Select Delta flight, departing Thu, Jan 29 from Seattle to Ontario, returning Sun, Feb 1, priced at $169 found 19 hours ago
Delta
Thu, Jan 29 - Sun, Feb 1
SEA
Seattle
ONT
Ontario
$204 Roundtrip, found 19 hours ago
$204
Roundtrip
found 19 hours ago
Select Delta flight, departing Thu, Jan 29 from Seattle to Ontario, returning Sun, Feb 1, priced at $204 found 19 hours ago
Delta
Thu, Jan 29 - Sun, Feb 1
SEA
Seattle
ONT
Ontario
$208 Roundtrip, found 19 hours ago
$208
Roundtrip
found 19 hours ago
Select Delta flight, departing Thu, Jan 29 from Seattle to Ontario, returning Sun, Feb 1, priced at $208 found 19 hours ago
Delta
Thu, Jan 29 - Sun, Feb 1
SEA
Seattle
ONT
Ontario
$218 Roundtrip, found 19 hours ago
$218
Roundtrip
found 19 hours ago
Select Delta flight, departing Thu, Jan 29 from Seattle to Ontario, returning Sun, Feb 1, priced at $218 found 19 hours ago

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

October is typically the cheapest month to fly

From $79 - $160 per traveler.

Alternative airports near Ontario

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

Select flight to John Wayne SNA. Cheapest option available. Average driving time to city center is 42 minutes. Flights from $268
SNA
John Wayne
Cheapest
Average driving time to city center42 min
Flights from $268
Flights from Seattle (SEA) to Ontario (ONT)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United
Popular airline
Hawaiian Airlines
Distance
1530 km
Average flight time
2 hours 39 mins