Alaska Airlines Flights from Ontario to Seattle
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1 Passenger
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Lowest fares from Ontario to Seattle
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One-way low-fare flights Ontario to Seattle.*
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From | To | Fare Type | Dates | Price | |
|---|---|---|---|---|---|
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: Feb 18, 2026 | From $98 Seen: 1 day ago | |
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: Oct 18, 2025 | From $98 Seen: 1 day ago | |
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: Oct 25, 2025 | From $98 Seen: 1 day ago | |
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: Feb 24, 2026 | From $98 Seen: 1 day ago | |
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: Feb 25, 2026 | From $98 Seen: 1 day ago | |
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: Feb 28, 2026 | From $98 Seen: 1 day ago | |
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: Mar 3, 2026 | From $98 Seen: 1 day ago | |
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: Mar 4, 2026 | From $98 Seen: 1 day ago |
*Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.
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