$88 United Cheap Flights from Ontario to Seattle

Find The Best Day To Fly from Ontario to Seattle

Amazing United ONT to SEA Flight Deals

The cheapest flights to Seattle - Tacoma Intl. found within the past 7 days were $153 round trip and $88 one way. Prices and availability subject to change. Additional terms may apply.

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FAQs about United Airlines Flights from ONT to SEA

Can I catch a flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) right now?

Be sure to check out the Covid-19 Travel Advisor to see if there are any present quarantine requirements and travel advice reports in place in Seattle, WA (SEA-Seattle - Tacoma Intl.) when jet-setting from Ontario, CA (ONT-Los Angeles - Ontario Intl.).

What terminal is United Airlines at Ontario, CA (ONT-Los Angeles - Ontario Intl.)?

You should find out which terminal United Airlines operates from at Ontario Airport once you receive your ticket. The same applies to information about your arrival at Seattle, WA (SEA-Seattle - Tacoma Intl.). If you can't locate those details, ask your airline.

Are there United Airlines non-stop flights from ONT to SEA?

If you want to fly with United Airlines from Ontario Airport to SEA, you'll need to make at least one stop. While you're waiting for your connecting flight, use the time to enjoy a bite to eat or check out the airport shops.

If I am not able to travel due to COVID-19, can I change my booking to a later date?

For more info about changing your flight to SEA, please visit our Customer Service Portal.

Which airlines offer COVID-19 measures and exercise social distancing rules?

Alaska Airlines, Delta and Southwest Airlines are just some of the many carriers that employ COVID-19 measures and use social distancing rules on their flights. Some of their strategies are cleaning with disinfectant and providing passenger masks.

What is the best day to buy a plane ticket?

This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2020. Wednesday and Friday prices are also good, but you may want to prepare your budget if booking on a Sunday, as data shows the end of the week is when prices are generally at their highest.

What are the cheapest days to fly?

Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2020, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.

How far in advance can you book a flight?

Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2020 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 2 weeks to 2 months prior to their travel dates.

How can I save money on airline tickets?

We'll let you in on a secret...You can save big on flights if you mix and match your airlines and fare types. In fact, travelers who booked flights on Travelocity in 2020 saved nearly 40% when their return flights consisted of two different airlines or fare types.

*According to flight demand on Travelocity.com from January to December 2020. Savings are subject to change based on departure location, date and destination.

Discover our best United flight from Ontario ONT to Seattle SEA 

To find the best deals on flights to Ontario from Seattle with United, just enter your travel dates, filter by United, and hit search. You’ll find flights to choose from and can sort by price, flight duration, and arrival or departure time.  

 

Return flights from Ontario ONT to Seattle SEA with United 

If you’re planning a round trip, booking return flights with United is usually the most cost-effective option. With airfares ranging from $153 to $175, it’s easy to find a flight that suits your budget. Prices and availability subject to change. Additional terms may apply. 

 

Book one-way United flights from Ontario ONT to Seattle SEA 

A one-way ticket gives you much greater flexibility—allowing you to choose your return date, destination, and time whenever you’re ready. By booking in advance you can find great deals on one-way tickets too. Right now, a one-way United flight from Ontario to Seattle costs from $88. Prices and availability subject to change. Additional terms may apply. 

 

The easy way to find cheap flights to Seattle SEA from  Ontario ONT with United 

To find a cheap United flight from Ontario ONT to Seattle SEA, sort your search results by price or filter by budget. Thanks to Travelocity’s Price Match Promise, if you find a better airfare deal anywhere else within 24 hours, we’ll credit or refund the difference. 

 

How to find our best airfare deals on United flights from Ontario ONT to Seattle SEA 

If you’re looking for cheap flights, it helps to be flexible when it comes to your travel dates. You’ll usually find lower cost tickets when you travel during quieter months such as November, or if you book a flight with a stopover. 

 

Find nonstop flights from Ontario ONT to Seattle SEA with United 

If you’re keen to be on Seattle soil fast, don’t waste time with a stopover—filter your search results to show direct United flights only. The journey takes around hour(s) min(s) – so you’ll be there before you know it. 

 

Flexible airline tickets for United flights from Ontario ONT to Seattle SEA 

Make sure you’re not out of pocket if plans change by choosing a flexible ticket with penalty-free amendment and cancellation options. Use our ‘no change fee’ filter to see which flights have this option.  

 

There are a lot of reasons to book your flights to Seattle SEA from  Ontario ONT with United on Travelocity 

At Travelocity our vast and up-to-the-minute inventory puts all of our best flight deals in one place. So, whether you’re traveling on business or jetting off with friends and family, you can trust Travelocity to get you there.

United Airports
Hop on a(n) United flight today by flying to many destinations out of these domestic and international airports:
Airport Code
Country
Airport Name
Number of Flights
ORDUSAO'Hare Intl.227
DENUSADenver Intl.226
IAHUSAGeorge Bush Intercontinental136
IADUSAWashington Dulles Intl.100
SFOUSASan Francisco Intl.64
LAXUSALos Angeles Intl.23
EWRUSALiberty Intl.20
FRADEUFrankfurt Intl.19
NRTJPNNarita Intl.19
PEKCHNCapital Intl.16

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