$34 Cheap Frontier Airlines flights from Ontario to Seattle (ONT to SEA)

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Find The Best Day To Fly from Ontario to Seattle

Amazing Frontier Airlines ONT to SEA Flight Deals

The cheapest flights to Seattle - Tacoma Intl. found within the past 7 days were $78 round trip and $34 one way. Prices and availability subject to change. Additional terms may apply.

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Prices and availability subject to change. Additional terms may apply.

Frequently asked questions

Can I catch a flight from Ontario Airport to Seattle - Tacoma Intl. Airport (SEA) right now?
It’s wise to know about any travel advice reports and quarantine requirements in place in your destination city. Be sure to check out the Covid-19 Travel Advisor for up-to-date information on catching a flight to Seattle - Tacoma Intl. Airport (SEA) from Los Angeles - Ontario Intl. Airport (ONT).
What terminal is Frontier Airlines at ONT?
Once you receive the boarding pass for your Frontier Airlines flight from Ontario Airport to Seattle - Tacoma Intl. Airport (SEA), you should be able to determine which terminals you’ll be jetting in and out of. Your carrier will have the answers if you can’t find those details on your ticket.
Are there Frontier Airlines non-stop flights from ONT to SEA?
As you can’t fly direct from Los Angeles - Ontario Intl. Airport (ONT) to Seattle - Tacoma Intl. Airport (SEA) with Frontier Airlines, make the most of your layover. Relax with a couple of drinks at a welcoming airport bar, or wander about the terminal and enjoy a little retail therapy.
How long is a Frontier Airlines flight from ONT to SEA?
As it’ll take an average of 5 hours and 35 minutes for your Frontier Airlines flight to head from ONT to SEA, consider tossing some entertaining travel games in your hand luggage. You never know — the person sitting next to you might appreciate a challenge to break up the trip.
How many direct and indirect flights does Frontier Airlines fly from ONT to SEA?
Each week, there are 7 Frontier Airlines flights linking ONT and Seattle - Tacoma Intl. Airport (SEA).
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.
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 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that 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 2021, 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 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

Discover our best Frontier Airlines flight from Ontario ONT to Seattle SEA 

To find the best deals on flights to Ontario from Seattle with Frontier Airlines, just enter your travel dates, filter by Frontier Airlines, 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 Frontier Airlines 

If you’re planning a round trip, booking return flights with Frontier Airlines is usually the most cost-effective option. With airfares ranging from $78 to $78, it’s easy to find a flight that suits your budget. Prices and availability subject to change. Additional terms may apply. 

 

Book one-way Frontier Airlines 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 Frontier Airlines flight from Ontario to Seattle costs from $34. Prices and availability subject to change. Additional terms may apply. 

 

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

To find a cheap Frontier Airlines 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 Frontier Airlines 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 May, or if you book a flight with a stopover. 

 

Find nonstop flights from Ontario ONT to Seattle SEA with Frontier Airlines 

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

 

Flexible airline tickets for Frontier Airlines 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 Frontier Airlines 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.

Frontier Airlines Airports
Hop on a(n) Frontier Airlines flight today by flying to many destinations out of these domestic and international airports:
Airport code
Country
Airport name
Number of flights
DENUSADenver Intl.13
MCOUSAOrlando Intl.7
CUNMEXCancun Intl.6
GDLMEXDon Miguel Hidalgo y Costilla Intl.5
PHLUSAPhiladelphia Intl.2
ORDUSAO'Hare Intl.2
MIAUSAMiami Intl.1
LASUSAMcCarran Intl.1
MEXMEXMexico City Intl.1
LAXUSALos Angeles Intl.1

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