Cheap flights from Ontario / Los Angeles (ONT) to Seattle (SEA)

According to our data, you can fly from Ontario / Los Angeles to Seattle starting from , and you can save even more with additional discounts and promos that can be found on our promo page.

For domestic flights, we recommend arriving at the airport in Ontario / Los Angeles at least 2 hours before your scheduled departure time. For international flights, aim to be at the airport at least 3 hours prior to ensure smooth check-in, security checks, and to account for any unexpected delays. It’s better to be early and relaxed than rushing at the last minute right? Every airline has its own rules about when check-in and baggage drop closes, so be sure to check before you head to Ontario / Los Angeles just in case.

There sure are! If you're new to Traveloka, you can check out our new user deals, where you can save up to AU$30 on flights. We do often have short-term specials or flash sales with codes that help you save even more. Check out the latest on our coupon code page.

Timing is everything when it comes to grabbing flight tickets. Typically, it’s best to book around 4-6 weeks in advance for domestic flights and a minimum of 2-3 months for international routes. But the prices also depend on the travel demand, seasonality, and major events. You can always monitor the fare trends on Traveloka and set alerts to catch the best deals or promotions. Consider shopping around big sales events, like EOFY, Black Friday or Boxing Day to get the best deal.

Looking for the best deals to Seattle? Historically, midweek flights (particularly on Tuesdays and Wednesdays), tend to be cheaper on just about every route, including Ontario / Los Angeles to Seattle, due to lower demand. However, airfares can fluctuate so we recommend keeping an eye on flight prices and being flexible with your travel dates. Booking in advance can be one the hacks to travel to Seattle without breaking the bank! It's easy to compare dates when booking flights form Ontario / Los Angeles with Traveloka, too. We automatically show pricing for the five days following your requested date to see when the cheapest fares are available.

When booking a flight to Seattle, and just about everywhere, you'll need to know the full legal name of every passenger on your booking. We also need your date of birth, nationality and passport details. It's also best to decide at the time you book your flight if you want to check a bag or choose a seat on your flight from Ontario / Los Angeles to Seattle, as it will be more expensive to add these on later or at the airport. And we're all about getting the best deal here at Traveloka!

Travelling from Ontario / Los Angeles to Seattle requires specific documents. For international flights, a passport is always necessary, this includes any domestic connections to international flights. The necessity of a visa depends on the traveller's citizenship and Seattle's entry regulations. It's crucial to verify visa requirements, as rules can differ between countries. However, for domestic flights, neither a passport nor a visa is usually required, but an official ID will be needed.

Booking flight tickets with Traveloka can feel like diving into an ocean of options! Our platform provides the most comprehensive choices to ensure you find the perfect flight for your adventure. With our smooth booking process, you'll also be provided with a variety of payment methods. Anxious about transacting online? We've got you covered with our top-tier security for each transaction! With Traveloka, your flight booking journey becomes hassle-free!

When flying direct, the flight from Ontario / Los Angeles to Seattle is about 2 hours and 45 minutes.

If you're looking to add on a hotel, activity or hire car to your trip we can help you save up to AU$80 on those. Simply download our app and use the promo code HELLOTRAVELOKA on your first purchase to save up to AU$30 on activities, up to AU$50 on hire cars and up to A$80 on hotel stays. Terms and conditions apply.

Set up price alerts for your preferred travel dates, check out the lowest-fare calendar above and make sure you book a few months in advance for the best prices on flights from Ontario / Los Angeles to Seattle.