Find Cheap Flights from Seattle/Tacoma Intl to Ontario (SEA - ONT)

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Seattle/Tacoma Intl to Ontario Flight Information

Avg. Flight Duration 2h 37m
Flights Arrive in Ontario
Flights Depart from Seattle/Tacoma Intl
Flight Price $177
Distance 957 miles
Airlines Alaska Airlines, United Airlines, American Airlines, Delta, Frontier

Good to Know

Low Season:
February
Best time to beat the crowds
2%
expected price decrease
High Season:
December
Most popular time to fly
8%
expected price increase
Average Price:
$287
(avg. price over the last 2 weeks)
Good Deal:
$176
or less (round trip)

When to Book Flights from Seattle/Tacoma Intl to Ontario

Estimated round-trip price
Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top Tips for Finding a Cheap Flight

Looking for a cheap flight? 25% of our users found flights on this route for $176 or less.
The cheapest flight from Seattle/Tacoma Intl to Ontario was found 29 days before departure, on average.
Book at least 2 weeks before departure in order to get a below-average price.
Morning departure is around 13% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking Seattle/Tacoma Intl to Ontario Flights

How long does a flight from Seattle/Tacoma Intl to Ontario take?
An average nonstop flight takes 2h 30m, covering a distance of 957 miles.
How many flights are there between Seattle/Tacoma Intl and Ontario?
There are 95 (nonstop) flights between Seattle/Tacoma Intl and Ontario per week, averaging 13 per day.
Which airlines provide the cheapest flights from Seattle/Tacoma Intl to Ontario?
In the past 3 days, the cheapest round-trip tickets were found on Alaska Airlines ($177), United Airlines ($180) and American Airlines ($180).
Do I need a passport to fly between Seattle/Tacoma Intl and Ontario?
No.
Which airlines fly most frequently between Seattle/Tacoma Intl and Ontario?
Alaska Airlines (7 times daily), American Airlines (6 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly Seattle/Tacoma Intl to Ontario?
For Seattle/Tacoma Intl to Ontario, Tuesday is the cheapest day to fly on average and Monday is the most expensive. Flying from Ontario back to Seattle/Tacoma Intl, the best deals are generally found on Tuesday, with Monday being the most expensive.

Find the Flight That Suits You Best

Wed 12/12
Wed 12/19
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Cheapest

Airline
Departure & Arrival Time
Stops
Duration
Alaska Airlines Alaska Airlines
SEA-ONT
11:00a - 2:30p
nonstop
2h 30m
SEA-ONT
$177
Alaska Airlines Alaska Airlines
ONT - SEA
2:30p - 11:00a
nonstop
2h 45m
ONT - SEA
View Deal

Best

Airline
Departure & Arrival Time
Stops
Duration
Alaska Airlines Alaska Airlines
SEA-ONT
11:00a - 2:30p
nonstop
2h 30m
SEA-ONT
$177
Alaska Airlines Alaska Airlines
ONT - SEA
2:30p - 11:00a
nonstop
2h 45m
ONT - SEA
View Deal

Quickest

Airline
Departure & Arrival Time
Stops
Duration
Alaska Airlines Alaska Airlines
SEA-ONT
11:00a - 2:30p
nonstop
2h 30m
SEA-ONT
$177
Alaska Airlines Alaska Airlines
ONT - SEA
2:30p - 11:00a
nonstop
2h 45m
ONT - SEA
View Deal

Earliest

Airline
Departure & Arrival Time
Stops
Duration
United Airlines United Airlines
SEA-ONT
1:35p - 7:50a
1 stop
5h 22m
SEA-ONT
$184
United
United Airlines United Airlines
ONT - SEA
7:50a - 1:35p
1 stop
5h 48m
ONT - SEA
View Deal
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.