Lowest Priced Flights to Ontario on Alaska Airlines starting at $70*
Most popular flights to Ontario on Alaska Airlines.*
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Ontario (ONT)Portland (PDX)to
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Ontario (ONT)Boise (BOI)to
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Ontario (ONT)Honolulu (HNL)to
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Ontario (ONT)*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.
Top offers for Ontario one-way flights.*
From | To | Fare Type | Dates | Price | |
|---|---|---|---|---|---|
| Boise (BOI) | Ontario (ONT) | One-way | Saver | Depart: May 5, 2026 | From $70 Seen: 11 hours ago | |
| Boise (BOI) | Ontario (ONT) | One-way | Saver | Depart: May 2, 2026 | From $74 Seen: 16 hours ago | |
| Boise (BOI) | Ontario (ONT) | One-way | Saver | Depart: Apr 21, 2026 | From $74 Seen: 16 hours ago | |
| Seattle (SEA) | Ontario (ONT) | One-way | Saver | Depart: Apr 14, 2026 | From $89 Seen: 1 hour ago | |
| Seattle (SEA) | Ontario (ONT) | One-way | Saver | Depart: Apr 28, 2026 | From $89 Seen: 1 hour ago | |
| Seattle (SEA) | Ontario (ONT) | One-way | Saver | Depart: Apr 21, 2026 | From $89 Seen: 1 hour ago | |
| Portland (PDX) | Ontario (ONT) | One-way | Saver | Depart: May 2, 2026 | From $89 Seen: 1 hour ago | |
| Portland (PDX) | Ontario (ONT) | One-way | Saver | Depart: May 9, 2026 | From $89 Seen: 1 hour ago | |
| Portland (PDX) | Ontario (ONT) | One-way | Saver | Depart: Apr 25, 2026 | From $89 Seen: 1 hour ago | |
| Portland (PDX) | Ontario (ONT) | One-way | Saver | Depart: Apr 28, 2026 | From $89 Seen: 1 hour ago | |
| Portland (PDX) | Ontario (ONT) | One-way | Saver | Depart: May 5, 2026 | From $89 Seen: 1 hour ago | |
| Portland (PDX) | Ontario (ONT) | One-way | Saver | Depart: May 6, 2026 | From $89 Seen: 1 hour ago | |
| Seattle (SEA) | Ontario (ONT) | One-way | Saver | Depart: May 19, 2026 | From $94 Seen: 1 hour ago | |
| Seattle (SEA) | Ontario (ONT) | One-way | Saver | Depart: Apr 25, 2026 | From $99 Seen: 1 hour ago | |
| Seattle (SEA) | Ontario (ONT) | One-way | Saver | Depart: Apr 30, 2026 | From $99 Seen: 1 hour ago | |
| Boise (BOI) | Ontario (ONT) | One-way | Saver | Depart: May 6, 2026 | From $99 Seen: 13 hours ago | |
| Boise (BOI) | Ontario (ONT) | One-way | Saver | Depart: May 1, 2026 | From $109 Seen: 13 hours ago | |
| Boise (BOI) | Ontario (ONT) | One-way | Saver | Depart: Apr 17, 2026 | From $109 Seen: 8 hours ago | |
| Santa Rosa (STS) | Ontario (ONT) | One-way | Saver | Depart: Jun 2, 2026 | From $119 Seen: 9 hours ago | |
| Santa Rosa (STS) | Ontario (ONT) | One-way | Saver | Depart: Apr 27, 2026 | From $119 Seen: 4 hours 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.
Plan a trip to Ontario
Nestled in Southern California’s Inland Empire, Ontario is known as the "gateway to southern California." Resting 35 miles east of downtown Los Angeles, popular attractions like Disneyland and the mountain retreats of Lake Arrowhead and Big Bear are all within reach. With easy access through Ontario International Airport, the city serves as a gateway to popular attractions, including nearby mountains, deserts, and beaches.
Whether you're exploring the scenic beauty of the San Gabriel Mountains, shopping at Ontario Mills, or catching an event at the Toyota Arena, Ontario has plenty to do and see. Its central location makes it an excellent base for discovering the best of Southern California.
Things to do in Ontario
- Shop, dine, and enjoy entertainment at Ontario Mills, one of the largest outlet malls in California.
- Catch a live concert or sports event at the Toyota Arena, a premier entertainment venue.
- Take a day trip to popular nearby cities like Los Angeles, San Diego, Santa Ana, and Palm Springs.
- Visit Cucamonga-Guasti Regional Park, perfect for picnicking, fishing, and enjoying water activities.
- Take a short drive to the scenic San Gabriel Mountains for hiking, biking, and winter sports. Alternatively, take the drive up to Big Bear Mountain for So Cal skiing.
- Savor local wines and stunning vineyard views at San Antonio Winery or nearby wine trails.
Best time to travel to Ontario
The best time to visit Ontario is during spring (March to May) and fall (September to November), when the weather is warm and ideal for outdoor activities. Summer (June to August) is great for shopping and indoor attractions, but the heat can rise to uncomfortable levels. Winter (December to February) offers colder temperatures and access to nearby ski resorts like Big Bear.
Looking for a different California destination? View more California flight deals from Alaska Airlines.
View airport information for Ontario International Airport (ONT)