Ontario

$53+ Cheap flights from Seattle to Ontario (SEA - ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/24. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ONT
Nov 9 — Nov 161
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Ontario with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

The best prices from Seattle/Tacoma Intl to Ontario are usually found in September or August, booked 71 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

Cheap flight deals from Seattle to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated November 4, 2024.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Popular in

December

Cheapest in

September

Round-trip from

$57
(Cheapflightsfares)

One-way from

$53
(Cheapflightsfares)
Provider with most accurate pricing for Seattle/Tacoma Intl-Ontario flight deals.
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Ontario flights.
High demand for flights, 24% potential price rise
Best time to find cheap flights, 34% potential price drop
From Seattle/Tacoma Intl to Ontario
One-way flight from Seattle/Tacoma Intl to Ontario

Find flight deals from Seattle to Ontario

Cheapest flights from Seattle to Ontario
Explore the most affordable flight options available from Seattle to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 4, 2024.

This Kiwi.com deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/226:35 pmSEA - ONT
Nonstop2h 40mFrontier
Thu 11/287:58 amONT - SEA
Nonstop2h 56mFrontier
Deal found 11/3$85
This Alaska Airlines deal was found by Cheapflights users on 11/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/76:30 pmSEA - ONT
Nonstop2h 34mAlaska Airlines
Tue 12/101:53 pmONT - SEA
Nonstop2h 53mAlaska Airlines
Deal found 11/4$137
This Delta deal was found by Cheapflights users on 11/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/207:55 pmSEA - ONT
Nonstop2h 50mDelta
Wed 11/275:40 amONT - SEA
Nonstop3h 00mDelta
Deal found 11/3$227
This United Airlines deal was found by Cheapflights users on 11/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/75:15 amSEA - ONT
1 stop4h 38mUnited Airlines
Tue 12/106:28 pmONT - SEA
1 stop6h 22mUnited Airlines
Deal found 11/4$246

Find flights from Seattle to Ontario within your budget

Customize your flight search to find flights from Seattle to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,455,398 searches. Data last updated November 4, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sun 11/24

7:22 pm-10:02 pm

Nonstop2h 40m

$53

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Mon 1/6

7:45 pm-10:32 pm

Nonstop2h 47m

$89

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Fri 1/24

11:36 am-5:59 pm

1 stop6h 23m

$118

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 12/4

11:56 am-5:43 pm

1 stop5h 47m

$123

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 11/13

12:55 pm-7:40 pm

2 stops6h 45m

$163

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Fri 11/22

6:35 pm-9:15 pm

Nonstop2h 40m

Ontario

Thu 11/28

7:58 am-10:54 am

Nonstop2h 56m

$85

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 12/7

6:30 pm-9:04 pm

Nonstop2h 34m

Ontario

Tue 12/10

1:53 pm-4:46 pm

Nonstop2h 53m

$137

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 11/19

2:00 pm-4:45 pm

Nonstop2h 45m

Ontario

Mon 11/25

5:40 am-8:40 am

Nonstop3h 00m

$207

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Fri 12/13

9:26 pm-11:59 pm

Nonstop2h 33m

Ontario

Tue 12/17

12:59 am-1:10 pm

1 stop12h 11m

$223

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 12/7

5:15 am-9:53 am

1 stop4h 38m

Ontario

Wed 12/11

6:00 am-10:46 am

1 stop4h 46m

$246

Flights are sorted by cheapest first

Deals found on 11/4

Compare providers for flights from Seattle to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Ontario in November.
ProviderPrice AccuracyTrust Score*Cancellation Policy
ExpediaPrice Accuracy1 starTrust Score*3 starsCancellation PolicyAirline Policy
FlightHubPrice Accuracy3 starsTrust Score*3 starsCancellation PolicyAirline Policy
eDreamsPrice Accuracy3 starsTrust Score*3 starsCancellation PolicyAirline Policy
CheapflightsfaresPrice Accuracy3 starsTrust Score*1 starCancellation PolicyAirline Policy
PricelinePrice Accuracy1 starTrust Score*3 starsCancellation PolicyAirline Policy
Kiwi.comPrice Accuracy3 starsTrust Score*3 starsCancellation PolicyNo Information
CheapfaremartPrice Accuracy-Trust Score*1 starCancellation PolicyAirline Policy
CheapOairPrice Accuracy2 starsTrust Score*3 starsCancellation PolicyAirline Policy
FlightsMojoPrice Accuracy-Trust Score*3 starsCancellation PolicyNo Information
GotogatePrice Accuracy3 starsTrust Score*2 starsCancellation PolicyAirline Policy

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Seattle to Ontario

Get recent, data-driven insights about flights from Seattle to Ontario including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Seattle to Ontario?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Ontario. Price data was last updated on November 1, 2024.

The best time to book flights from Seattle to Ontario is 71 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Seattle to Ontario?

Currently, September is the cheapest month in which you can book a flight from Seattle to Ontario (average of $236). Flying from Seattle to Ontario in December is currently the most expensive (average of $298). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to ONT?

Find hourly flight availability from Seattle to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 4, 2024.

A simple way to save on the total cost of your ticket is to fly from Seattle to Ontario at noon. If you’re flexible enough to do this you can expect to save up to 43% on your trip compared to booking a flight in the morning.

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

Use this chart to determine the cheapest time to fly round-trip from Seattle to Ontario. Price data was last updated on November 3, 2024.

Travelers seeking maximum savings on their Seattle to Ontario flight should consider departing on Saturday at noon when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Seattle to Ontario

Explore weekly flight availability from Seattle to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated November 4, 2024.

The most flights from SEA to ONT are scheduled on a Monday (23 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (4 on average).

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated November 4, 2024.
Read through reviews of airlines operating flights from Seattle to Ontario, such as Frontier, Alaska Airlines and Delta. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
8.1
Very good
5,089 reviews

Overall

8.1

Boarding

8.3

Crew

8.7

Entertainment

7.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

8.1
Very good
5,089 reviews
8.1
Very good
5,089 reviews

Overall

8.1

Boarding

8.3

Crew

8.7

Entertainment

7.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

8.0
Very good
9,423 reviews
8.1
Very good
5,089 reviews

Overall

8.1

Boarding

8.3

Crew

8.7

Entertainment

7.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

8.0
Very good
8,829 reviews
8.1
Very good
5,089 reviews

Overall

8.1

Boarding

8.3

Crew

8.7

Entertainment

7.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

7.4
Good
9,226 reviews
8.1
Very good
5,089 reviews

Overall

8.1

Boarding

8.3

Crew

8.7

Entertainment

7.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

6.1
Okay
3,573 reviews
8.1
Very good
5,089 reviews

Overall

8.1

Boarding

8.3

Crew

8.7

Entertainment

7.7

Food

7.2

Comfort

8.1

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Related info for your journey

Find useful and relevant information for your journey from Seattle to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What airports do I use to fly from Seattle to Ontario?

    Booking a flight from Seattle/Tacoma Intl (SEA) to Ontario (ONT) is your only option if you wish to fly from Seattle to Ontario. On a typical day, there are 13 flights from Seattle/Tacoma Intl to Ontario, all of which are around 2h 36m for a nonstop flight. You can also purchase a plane ticket from 4 airlines when you book a flight from Seattle/Tacoma Intl to Ontario.

  • Can I find flights from Seattle to Ontario for under $100 on Cheapflights?

    Yes, there are multiple flights from Seattle to Ontario for under $100. The cheapest flight booked recently is on Frontier for just $57, but on average you can expect to pay $133.

  • Are there nonstop flights from Seattle to Ontario for under $100 on Cheapflights?

    Cheapflights has at least 4 direct flights from Seattle to Ontario under $100. A good price for a nonstop flight from Seattle to Ontario is less than $132.

  • Are there last-minute flights available from Seattle to Ontario for under $100?

    There are currently 6+ open flights from Seattle to Ontario within the next 7 days for less than $100.

  • What days are nonstop flights available from Seattle to Ontario?

    You can find nonstop flights on the following days: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday.

  • How popular is this Seattle to Ontario flight route?

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

    Travelers can expect 11 flights from Seattle to Ontario on average per day.
    Morning (6am - Noon) - 64% of flight departures
    Afternoon (Noon - 6pm) - 36% of flight departures

  • How long is the flight from Seattle to Ontario?

    A quick flight from Seattle to Ontario can take about 2h 33m. Frontier provides one of the quickest options available for as low as $57. The distance from Seattle to Ontario is about 962 mi. Generally, flights for this route are nonstop.

  • What are the cheapest airlines flying from Seattle to Ontario round-trip?

    Our cheapest airline available from Seattle to Ontario is Frontier. Our recent data shows that you can find tickets from as low as $57 on this airline. Additional options worth looking into are Alaska Airlines and Delta, starting at $137 and $207 round-trip. Frontier is priced at 72% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Seattle to Ontario one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $53. Users have also found prices from $89 and $118 on Delta and Alaska Airlines, respectively.

  • What are the most reliable airlines from Seattle to Ontario?

    Before booking your flight to Ontario from Seattle, check out the most reliable airlines to get you to your destination on time: Air France (100%), Aeromexico (100%), Virgin Atlantic( 99%).

  • What are the cheapest flights from Seattle to Ontario?

    Looking at all options, your cheapest flight can be booked for $47. While the most popular route (Seattle/Tacoma Intl - Ontario) can be booked for $57 on average our data indicates $398 when flying from Seattle to Ontario.

  • What does SEA to ONT mean?

    SEA stands for Seattle/Tacoma Intl Airport, while ONT stands for Ontario Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry.

  • Can I find deals for flights from Seattle to Ontario that include extra baggage allowance?

    The amount of baggage you can bring on your Seattle to Ontario flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Seattle to Ontario with specific airlines?

    Yes, Cheapflights allows you to browse and filter Seattle to Ontario flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Seattle to Ontario that include hotel bookings?

    Yes. In addition to deals on Seattle to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Ontario.

  • Can I find deals for business class flights from Seattle to Ontario?

    Yes. Cheapflights offers flight deals from Seattle to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Seattle to Ontario that allow pets onboard?

    Many airlines flying from Seattle to Ontario offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Seattle to Ontario?

    Yes, you can often find last-minute deals on Seattle to Ontario flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Seattle to Ontario flight deals updated?

    The Seattle to Ontario flight deals you see on this page were last updated on 11/4.

  • What is the cheapest month to book a flight from Seattle to Ontario?

    Currently, September is the cheapest month in which you can book a flight from Seattle to Ontario (average of $236). Flying from Seattle to Ontario in December is currently the most expensive (average of $298). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

Top 4 airlines flying from Seattle to Ontario

Discover the top 4 airlines that operate flights from Seattle to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,455,398 searches. Data last updated November 4, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$40Average$127FlexibilityNo cancel feeOn-time65%
FrontierCheapest$54Average$127FlexibilityNo cancel feeOn-time62%
DeltaCheapest$108Average$265FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$111Average$265FlexibilityNo cancel feeOn-time75%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.