Latest deals
Insights
FAQs
Reviews

Cheap flights from Seattle to Ontario from $49

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Ontario departing on 6/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags
From?
To?
Mon 6/3
Mon 6/10

Deals available from 900+ travel sites.

"This year, momondo is the #1 place for airfares on the internet."
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.
Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.
Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.
Price Alerts
Price Alerts
Not ready to book? Create a price alert to track prices.

Easily compare round-trip flights from Seattle to Ontario

Below you can see the best fares for your round-trip flight route over the next six months. All fares were found on momondo this week. Browse the quickest and cheapest flights from Seattle to Ontario by changing tabs
Frontier
Jun 15
SEA3:36 pmSeattle/Tacoma Intl
2h 44m
ONT6:20 pmOntario
Jun 18
ONT9:54 amOntario
2h 53m
SEA12:47 pmSeattle/Tacoma Intl
Multiple Airlines
Jul 2
SEA6:30 amSeattle/Tacoma Intl
2h 35m
ONT9:05 amOntario
Jul 5
ONT6:20 pmOntario
2h 36m
SEA8:56 pmSeattle/Tacoma Intl
Alaska Airlines
Jul 10
SEA6:30 amSeattle/Tacoma Intl
2h 35m
ONT9:05 amOntario
Jul 16
ONT8:20 pmOntario
2h 35m
SEA10:55 pmSeattle/Tacoma Intl
Delta
Jul 2
SEA7:10 amSeattle/Tacoma Intl
5h 08m
1 stop
ONT12:18 pmOntario
Jul 9
ONT11:49 amOntario
2h 46m
SEA2:35 pmSeattle/Tacoma Intl
Frontier
Jun 12
SEA1:57 pmSeattle/Tacoma Intl
2h 44m
ONT4:41 pmOntario
Jun 19
ONT10:04 amOntario
2h 53m
SEA12:57 pmSeattle/Tacoma Intl
Frontier
Jun 8
SEA3:36 pmSeattle/Tacoma Intl
2h 44m
ONT6:20 pmOntario
Jun 11
ONT9:54 amOntario
2h 53m
SEA12:47 pmSeattle/Tacoma Intl

Find the cheapest one-way flights from Seattle to Ontario

If you're looking for one-way flights from Seattle to Ontario, view some of our deals below provided by Alaska Airlines, Delta and Frontier
Frontier
Jun 5
SEA2:22 pmSeattle/Tacoma Intl
2h 44m
ONT5:06 pmOntario
Delta
Aug 13
SEA5:30 amSeattle/Tacoma Intl
6h 45m
1 stop
ONT12:15 pmOntario
Alaska Airlines
Jun 30
SEA9:26 pmSeattle/Tacoma Intl
2h 33m
ONT11:59 pmOntario

Search last-minute flights to Ontario from Seattle

Find and compare round-trip flight prices for your last-minute flight from Seattle to Ontario
Frontier
Jun 4
SEA1:57 pmSeattle/Tacoma Intl
2h 44m
ONT4:41 pmOntario
Jun 18
ONT9:54 amOntario
2h 53m
SEA12:47 pmSeattle/Tacoma Intl
Frontier
Jun 5
SEA2:22 pmSeattle/Tacoma Intl
2h 44m
ONT5:06 pmOntario
Jun 12
ONT10:04 amOntario
2h 53m
SEA12:57 pmSeattle/Tacoma Intl
Frontier
Jun 4
SEA1:57 pmSeattle/Tacoma Intl
2h 44m
ONT4:41 pmOntario
Jun 12
ONT10:04 amOntario
2h 53m
SEA12:57 pmSeattle/Tacoma Intl
Frontier
Jun 8
SEA3:36 pmSeattle/Tacoma Intl
2h 44m
ONT6:20 pmOntario
Jun 11
ONT9:54 amOntario
2h 53m
SEA12:47 pmSeattle/Tacoma Intl
Frontier
Jun 7
SEA1:57 pmSeattle/Tacoma Intl
2h 44m
ONT4:41 pmOntario
Jun 8
ONT3:39 pmOntario
17h 31m
2 stops
SEA9:10 amSeattle/Tacoma Intl
Delta
Jun 8
SEA3:15 pmSeattle/Tacoma Intl
2h 35m
ONT5:50 pmOntario
Jun 13
ONT6:30 pmOntario
2h 44m
SEA9:14 pmSeattle/Tacoma Intl

Frontier flights from Seattle to Ontario

Our best Frontier deals on Seattle to Ontario flight tickets
Frontier
Jun 4
SEA1:57 pmSeattle/Tacoma Intl
2h 44m
ONT4:41 pmOntario
Jun 18
ONT9:54 amOntario
2h 53m
SEA12:47 pmSeattle/Tacoma Intl
Frontier
Jun 12
SEA1:57 pmSeattle/Tacoma Intl
2h 44m
ONT4:41 pmOntario
Jun 19
ONT10:04 amOntario
2h 53m
SEA12:57 pmSeattle/Tacoma Intl
Frontier
Jun 8
SEA3:36 pmSeattle/Tacoma Intl
2h 44m
ONT6:20 pmOntario
Jun 11
ONT9:54 amOntario
2h 53m
SEA12:47 pmSeattle/Tacoma Intl

Delta flights from Seattle to Ontario

Our best Delta deals on Seattle to Ontario flight tickets
Delta
Jul 2
SEA7:10 amSeattle/Tacoma Intl
5h 08m
1 stop
ONT12:18 pmOntario
Jul 9
ONT11:49 amOntario
2h 46m
SEA2:35 pmSeattle/Tacoma Intl
Delta
Jul 24
SEA5:30 amSeattle/Tacoma Intl
6h 45m
1 stop
ONT12:15 pmOntario
Aug 8
ONT5:00 pmOntario
6h 57m
1 stop
SEA11:57 pmSeattle/Tacoma Intl
Delta
Jul 2
SEA5:30 amSeattle/Tacoma Intl
6h 48m
1 stop
ONT12:18 pmOntario
Jul 9
ONT1:21 pmOntario
5h 03m
1 stop
SEA6:24 pmSeattle/Tacoma Intl

How to get the cheapest flight ticket from Seattle to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly from Seattle to Ontario?

September. The cheapest time of year to fly to Ontario from Seattle is September. Most expensive is December

What is the cheapest day to depart Seattle for Ontario?

Tuesday. The cheapest day of the week is typically Tuesday. The most expensive is typically Sunday

When is the cheapest time to fly from Seattle to Ontario?

At noon. Seattle to Ontario flights are approximately 38% more expensive in the afternoon than at noon

What is the cheapest airline that flies to Ontario from Seattle?

Frontier. Alaska Airlines, Delta, and Frontier are the most popular carriers operating from Seattle to Ontario

What is the cheapest Seattle to Ontario flight route?

Seattle/Tacoma Intl - Ontario. Fly from Seattle/Tacoma Intl to Ontario for the best Seattle - Ontario flight prices

How far in advance should you book Seattle to Ontario flights?

52 days before. The cheapest time to buy a flight from Seattle to Ontario is approximately 52 days to departure

How many flights depart from Seattle to Ontario on average per day?

As of May 2024, 13 flights take off from Seattle and land in Ontario each day. The most common flight departure time for this route is 12:00PM, with 54% of daily flights taking off in the afternoon.

How many flights depart from Seattle to Ontario on average per week?

The number of flights available between Seattle and Ontario is 95 per week as of May 2024. The most frequent departure day is Monday, with 17% of weekly flights leaving on this day.

What cabin class options are available on Seattle to Ontario flights?

There are 2 cabin classes available to choose from on Seattle to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Seattle to Ontario flights?

No. A direct flight is the cheapest option for a flight between Seattle to Ontario.

Cheap Seattle to Ontario (SEA to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Ontario

Best Price Found

$49

Fastest flight time

2h 32m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Seattle in the past 72 hours is $49. The best round-trip flight deal from Seattle to Ontario found on momondo in the last 72 hours is $98.
The fastest flight from Seattle to Ontario takes 2h 32m
Direct flights go from Seattle to Ontario every day.
There is 1 airport near Ontario: Ontario (ONT)

  • How far is Seattle/Tacoma Intl to Ontario by plane?

    The distance between Seattle/Tacoma Intl and Ontario is about 966.6 mi. A reasonable flight in good conditions will take 2h 35m.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Ontario Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Ontario Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Ontario Airport?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Ontario Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Ontario Airport.

  • What documentation or ID do you need to fly to Ontario Airport?

    The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.


Best airlines flying from Seattle to Ontario

Compare and see reviews for airlines that fly from Seattle to Ontario with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $49Free CancellationRating
7.4
10,784 reviews
Search United Airlines flights
FrontierPriceFrom $52Free CancellationRating
6.2
4,016 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $75Free CancellationRating
6.4
8,615 reviews
Search Spirit Airlines flights
DeltaPriceFrom $78Free CancellationRating
8.0
10,457 reviews
Search Delta flights
Alaska AirlinesPriceFrom $84Free CancellationRating
8.0
9,192 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $256Free CancellationRating
7.3
14,302 reviews
Search American Airlines flights
  • Delta Flights From Seattle to Ontario

    Delta flies from Seattle to Ontario around 21 times per week, with 10,457 momondo users rating the airline 8.0/10. The cheapest Delta deal from Seattle to Ontario in the last 72 hours was $78 (round-trip), much lower than the average airfare cost of $226 for Delta flights on this route.

  • Alaska Airlines Flights From Seattle to Ontario

    Alaska Airlines (8.0/10 from 9,192 reviews) operates around 21 flights from Seattle to Ontario in any given week. The average Alaska Airlines airfare for this route is around $228, with deals from around $84 rare but found on momondo. Referenced prices are for round-trip Seattle to Ontario flight searches in the last 72 hours.


Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Ontario?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Seattle to Ontario for you.

Can I find flights from Seattle to Ontario with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Seattle to Ontario flights to just show those with flexible booking policies.

How can momondo help me find flights from Seattle to Ontario?

momondo helps you find the best flight between Seattle and Ontario by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Seattle to Ontario right now. Can momondo alert me if prices change?

Price alerts on flights to Ontario from Seattle are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.


An easier way to manage your Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
From?
To?
Mon 6/3
Mon 6/10
Email me momondo's favorite deals

Find better results for your trip to the United States