ONT to SEA (Ontario to Seattle) Flights

Last Minute Flights from ONT to SEA

Price found within the past 7 days for the specified period. Click for updated prices.

OriginDestinationTravel DatesFlights From*
ONTSeattleMarch 21 to March 25$417
*Prices include taxes and fees

Cheapest ONT to SEA Flights

Price found within the past 7 days for the specified period. Click for updated prices.

OriginDestinationTravel DatesFlights From*
ONTSeattleMay 21 to May 31$124
ONTSeattleMay 9 to May 10$139
ONTSeattleApril 23 to May 2$154
ONTSeattleApril 25 to May 2$157
ONTSeattleApril 14 to April 21$197
*Prices include taxes and fees
ONT to SEA Flight Details
Origin airport
Los Angeles - Ontario Intl.
Origin airport IATA code
ONT
Destination airport
Seattle - Tacoma Intl.
Destination airport IATA code
SEA
Distance
956 mi

Frequently asked questions

What airlines fly direct from ONT to Seattle - Tacoma Intl. Airport (SEA)?
Delta Air Lines (DL) and Alaska Airlines (AS) can fly you nonstop from ONT to SEA. The first airline operates 121 of these services monthly, while the other provides 108 per month. Relax, put your seat back and look forward to getting to your destination fast.
How many flights are there from ONT to SEA?
Roughly 7 a day. If you're in a hurry to visit SeaTac, see if you can pick up a fabulous last-minute deal from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) and then lock it in right away!
How long does it take to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The journey between Ontario, CA (ONT-Los Angeles - Ontario Intl.) and Seattle, WA (SEA-Seattle - Tacoma Intl.) is a quick one, taking on average 2 hours and 52 minutes. Close your eyes and rest or enjoy reading a chapter or two from your book.
What is the flight distance from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
A tablet crammed with stuff to watch will help while away time on this medium-haul trip of 960 miles (1,550 1). While you'll probably have in-flight entertainment, nothing beats having your favorite film right at your fingertips.
How many morning flights are there from ONT to SEA?
With 28 morning flights from ONT to SEA each week, you're not short of options to select from.

  • Jet out with Alaska Airlines (AS). It offers 14 weekly flights that depart before noon. The first one takes to the skies at 6:00AM.
  • Or else, secure a fare with Delta Air Lines (DL) and depart as early as 6:50AM. This company operates 14 morning flights each week between ONT and SEA.

How many afternoon flights are there from ONT to SEA?
Say no to the crack-of-dawn race to the airport and select one of the 25 weekly afternoon and evening flights from ONT to SEA. Afternoon and evening services available with Delta Air Lines (DL) take off from 2:00PM. Overall, this popular carrier operates 14 weekly flights departing after midday.
What is the earliest departure time out of Ontario to SeaTac?
The earliest flight takes off from ONT at 6:00AM and hits the runway at SEA at 8:45AM. Remember to give yourself adequate time in the morning to get to the airport.
What is the latest departure time out of Ontario to SeaTac?
The last flight departs ONT at 7:59PM and lands at SEA at 10:37PM. You'll have ample time to get ready for this trip.
What is the average price from Ontario to SeaTac?
Round-trip tickets from ONT to SEA start from around $124. Great fares wait for nobody, so be prepared to hit "book" when you see a bargain. This price was available on Flights.com within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Ontario to Seattle Flights

Whether it’s for an obligation or the sake of your sanity, sometimes you need to get away. Maybe you need flights from Ontario to Seattle to attend your cousin’s wedding, to pitch a business idea to your boss, or simply treat yourself to a mini vacation. Regardless of the reasons behind packing your bags and needing to find our cheapest flights from ONT to SEA, we’ve got you covered here at Flights.com.

We present you with some of the most affordable deals on airfare, so stop that Google flights search. We want you to spend less on your flight from Ontario to Seattle, so you can spend more during your getaway. With Flights.com, you’ll find it simple to land airline tickets with itineraries matching your travel schedule. What’s more, we provide you with all the information you need to confidently make reservations on your family, business, or personal trip.

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