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Get United's best fares today on flights from Seattle to Ontario from *

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FromToDatesFare TypePrice

Seattle (SEA)

Ontario (ONT)

Depart: 07/07/20

Return: 07/14/20

Roundtrip
from
$166*
Viewed:19hoursago

Seattle (SEA)

Ontario (ONT)

Depart: 07/08/20

Return: 07/15/20

Roundtrip
from
$166*
Viewed:19hoursago

Seattle (SEA)

Ontario (ONT)

Depart: 07/14/20

Return: 07/21/20

Roundtrip
from
$166*
Viewed:19hoursago

Seattle (SEA)

Ontario (ONT)

Depart: 07/15/20

Return: 07/22/20

Roundtrip
from
$166*
Viewed:19hoursago

Seattle (SEA)

Ontario (ONT)

Depart: 07/21/20

Return: 07/28/20

Roundtrip
from
$166*
Viewed:19hoursago

Seattle (SEA)

Ontario (ONT)

Depart: 07/22/20

Return: 07/29/20

Roundtrip
from
$166*
Viewed:19hoursago

Seattle (SEA)

Ontario (ONT)

Depart: 07/07/20

Return: 07/21/20

Roundtrip
from
$166*
Viewed:19hoursago

Seattle (SEA)

Ontario (ONT)

Depart: 07/08/20

Return: 07/22/20

Roundtrip
from
$166*
Viewed:19hoursago

Seattle (SEA)

Ontario (ONT)

Depart: 07/14/20

Return: 07/28/20

Roundtrip
from
$166*
Viewed:19hoursago

Seattle (SEA)

Ontario (ONT)

Depart: 07/15/20

Return: 07/29/20

Roundtrip
from
$166*
Viewed:19hoursago

*Prices have been available for round trips within the last 48 hours and may not be currently available. Fares listed may be Basic Economy, which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for other optional service may apply. Other terms and conditions may apply.

Weather in Ontario

Tuesday sky is clear
91°F 05/26/20
Wednesday sky is clear
86°F 05/27/20
Thursday sky is clear
86°F 05/28/20
Friday sky is clear
82°F 05/29/20
Saturday overcast clouds
75°F 05/30/20
Sunday overcast clouds
77°F 05/31/20
Monday broken clouds
83°F 06/01/20
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