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$29+ 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 9/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ONT
Jul 30 — Aug 61
From?
To?
Tue 7/30
Tue 8/6
1 adult, Economy
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The best prices from Seattle/Tacoma Intl to Ontario are usually found in September or October, booked 76 days in advance, depart on a Wednesday or Tuesday 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 July 25, 2024.

Popular in

December

Cheapest in

September

Round-trip from

$58
(Frontier)

One-way from

$29
(Frontier)
High demand for flights, 25% potential price rise
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Best time to find cheap flights, 31% potential price drop
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From Seattle/Tacoma Intl to Ontario
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One-way flight from Seattle/Tacoma Intl to Ontario
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What is the cheapest day to fly round-trip from Seattle to Ontario?

Flying to your destination on a Saturday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to Ontario. Check prices with Cheapflights to find a great deal for your trip.

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

Users have found that booking a flight from Seattle to Ontario at least 40 days early can save you up to 77% on average compared to booking a flight this week. If booking 40 days before your flight isn’t an option for you, users have found flights from Seattle to Ontario for as little as $271 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $383 for flights departing within the next 3 days.

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

Flights from Seattle to Ontario lean towards being more expensive in March. Prices are generally better when you fly from Seattle to Ontario in September, with the cheapest ticket starting at $69.

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

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 47% on your trip compared to booking a flight in the evening.

Cheap Seattle to Ontario flights in July & August 2024

Find cheap flight options from Seattle to Ontario specifically for the months of July and August 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,752,877 searches. Prices were last updated on July 25, 2024.
These are some of the best deals we've found on flights to Ontario in 2024 at this time. Check back soon for alternative fares.
This Frontier deal was found by Cheapflights users on 7/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/273:20 pmSEA - ONT
Nonstop2h 47mFrontier
Tue 9/311:44 amONT - SEA
Nonstop2h 36mFrontier
Deal found 7/25$76
This mytrip.com deal was found by Cheapflights users on 7/24. 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 mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/314:19 pmSEA - ONT
Nonstop2h 47mFrontier
Wed 9/44:01 pmONT - SEA
Nonstop2h 36mFrontier
Deal found 7/24$78
This Frontier deal was found by Cheapflights users on 7/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/293:20 pmSEA - ONT
Nonstop2h 47mFrontier
Tue 9/311:44 amONT - SEA
Nonstop2h 36mFrontier
Deal found 7/25$92
This Frontier deal was found by Cheapflights users on 7/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/199:44 amSEA - ONT
Nonstop2h 47mFrontier
Mon 8/194:01 pmONT - SEA
Nonstop2h 36mFrontier
Deal found 7/24$93
This mytrip.com deal was found by Cheapflights users on 7/24. 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 mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/219:44 amSEA - ONT
Nonstop2h 47mFrontier
Wed 8/214:01 pmONT - SEA
Nonstop2h 36mFrontier
Deal found 7/24$94
This mytrip.com deal was found by Cheapflights users on 7/23. 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 mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/149:44 amSEA - ONT
Nonstop2h 47mFrontier
Wed 8/144:01 pmONT - SEA
Nonstop2h 36mFrontier
Deal found 7/23$95
This Frontier deal was found by Cheapflights users on 7/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/71:39 pmSEA - ONT
Nonstop2h 47mFrontier
Wed 8/284:01 pmONT - SEA
Nonstop2h 36mFrontier
Deal found 7/25$96
This Frontier deal was found by Cheapflights users on 7/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/219:44 amSEA - ONT
Nonstop2h 47mFrontier
Wed 8/284:01 pmONT - SEA
Nonstop2h 36mFrontier
Deal found 7/25$97
This Frontier deal was found by Cheapflights users on 7/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/149:44 amSEA - ONT
Nonstop2h 47mFrontier
Mon 8/194:01 pmONT - SEA
Nonstop2h 36mFrontier
Deal found 7/24$98

Seattle to Ontario 2024 flight deals

Discover exclusive flight deals for travel between Seattle and Ontario in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated July 25, 2024.
These are some of the best deals we've found on flights to Ontario in 2024 at this time. Check back soon for alternative fares.
This Frontier deal was found by Cheapflights users on 7/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/231:37 pmSEA - ONT
Nonstop2h 37mFrontier
Wed 10/309:50 amONT - SEA
Nonstop2h 47mFrontier
Deal found 7/24$58
This mytrip.com deal was found by Cheapflights users on 7/25. 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 mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/81:22 pmSEA - ONT
Nonstop2h 37mFrontier
Tue 10/159:35 amONT - SEA
Nonstop2h 47mFrontier
Deal found 7/25$60
This Frontier deal was found by Cheapflights users on 7/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/161:53 pmSEA - ONT
Nonstop2h 37mFrontier
Tue 11/199:35 amONT - SEA
Nonstop2h 47mFrontier
Deal found 7/25$73
This Frontier deal was found by Cheapflights users on 7/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/273:20 pmSEA - ONT
Nonstop2h 47mFrontier
Tue 9/311:44 amONT - SEA
Nonstop2h 36mFrontier
Deal found 7/25$76
This mytrip.com deal was found by Cheapflights users on 7/24. 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 mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/314:19 pmSEA - ONT
Nonstop2h 47mFrontier
Wed 9/44:01 pmONT - SEA
Nonstop2h 36mFrontier
Deal found 7/24$78
This Frontier deal was found by Cheapflights users on 7/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/51:22 pmSEA - ONT
Nonstop2h 37mFrontier
Wed 11/69:50 amONT - SEA
Nonstop2h 47mFrontier
Deal found 7/25$79
This Frontier deal was found by Cheapflights users on 7/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/81:53 pmSEA - ONT
Nonstop2h 37mFrontier
Tue 11/129:35 amONT - SEA
Nonstop2h 47mFrontier
Deal found 7/24$83
This Kiwi.com deal was found by Cheapflights users on 7/25. 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.
Sat 10/121:53 pmSEA - ONT
Nonstop2h 37mFrontier
Tue 10/159:35 amONT - SEA
Nonstop2h 47mFrontier
Deal found 7/25$85
This Frontier deal was found by Cheapflights users on 7/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/293:20 pmSEA - ONT
Nonstop2h 47mFrontier
Tue 9/311:44 amONT - SEA
Nonstop2h 36mFrontier
Deal found 7/25$92

Seattle to Ontario flights leaving soon

Find last-minute flight options from Seattle to Ontario for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated July 25, 2024.
Have a look at some of the last-minute flights available departing from Seattle to Ontario. Users should be sure to double check the price, date, and time of their last-minute flight.
This Frontier deal was found by Cheapflights users on 7/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/311:34 pmSEA - ONT
Nonstop2h 47mFrontier
Wed 8/710:03 amONT - SEA
Nonstop2h 36mFrontier
Deal found 7/24$98
This mytrip.com deal was found by Cheapflights users on 7/24. 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 mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/13:34 pmSEA - ONT
Nonstop2h 47mFrontier
Tue 8/610:03 amONT - SEA
Nonstop2h 36mFrontier
Deal found 7/24$99
This Kiwi.com deal was found by Cheapflights users on 7/24. 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.
Wed 7/311:34 pmSEA - ONT
Nonstop2h 47mFrontier
Mon 8/56:19 pmONT - SEA
Nonstop2h 36mFrontier
Deal found 7/24$100
This Frontier deal was found by Cheapflights users on 7/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/34:24 pmSEA - ONT
Nonstop2h 44mFrontier
Tue 8/610:03 amONT - SEA
Nonstop2h 36mFrontier
Deal found 7/24$119
This mytrip.com deal was found by Cheapflights users on 7/24. 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 mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/13:34 pmSEA - ONT
Nonstop2h 47mFrontier
Thu 8/2211:44 amONT - SEA
Nonstop2h 36mFrontier
Deal found 7/24$121
This mytrip.com deal was found by Cheapflights users on 7/24. 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 mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/311:34 pmSEA - ONT
Nonstop2h 47mFrontier
Wed 8/75:26 pmONT - SEA
1 stop19h 35mFrontier
Deal found 7/24$125
This mytrip.com deal was found by Cheapflights users on 7/24. 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 mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/13:34 pmSEA - ONT
Nonstop2h 47mFrontier
Wed 8/78:05 pmONT - SEA
1 stop16h 56mFrontier
Deal found 7/24$126
This CheapOair deal was found by Cheapflights users on 7/24. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/13:34 pmSEA - ONT
Nonstop2h 47mFrontier
Thu 8/812:03 pmONT - SEA
Nonstop2h 36mFrontier
Deal found 7/24$129
This mytrip.com deal was found by Cheapflights users on 7/24. 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 mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/311:34 pmSEA - ONT
Nonstop2h 47mFrontier
Thu 8/86:05 amONT - SEA
1 stop25h 00mFrontier
Deal found 7/24$130

One-way flights to Ontario from Seattle

Search for one-way flight options from Seattle to Ontario. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,752,877 searches. Data last updated July 25, 2024.
Take a look at some of the one-way flights we've detected from Seattle to Ontario. Those needing a return flight from Seattle to Ontario can use the search form above.
This Frontier deal was found by Cheapflights users on 7/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/49:44 amSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/24$29
This mytrip.com deal was found by Cheapflights users on 7/24. 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 mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/81:22 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 7/24$30
This Frontier deal was found by Cheapflights users on 7/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/261:53 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 7/25$44
This Frontier deal was found by Cheapflights users on 7/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/273:20 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/25$47
This Frontier deal was found by Cheapflights users on 7/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/289:44 amSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/24$48
This Frontier deal was found by Cheapflights users on 7/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/219:44 amSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/24$49
This mytrip.com deal was found by Cheapflights users on 7/24. 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 mytrip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/133:20 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 7/24$50
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Tue 10/221:22 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 7/23$51
This Frontier deal was found by Cheapflights users on 7/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/151:53 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 7/24$54

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 2,752,877 searches. Data last updated July 25, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$58 - $147

Route

Depart

Return

Price

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 10/23

Nonstop2h 37m

Ontario

Wed 10/30

Nonstop2h 47m

$58

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 10/8

Nonstop2h 37m

Ontario

Tue 10/15

Nonstop2h 47m

$60

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 11/16

Nonstop2h 37m

Ontario

Tue 11/19

Nonstop2h 47m

$73

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 8/27

Nonstop2h 47m

Ontario

Tue 9/3

Nonstop2h 36m

$76

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 8/31

Nonstop2h 47m

Ontario

Wed 9/4

Nonstop2h 36m

$78

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 11/5

Nonstop2h 37m

Ontario

Wed 11/6

Nonstop2h 47m

$79

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Fri 11/8

Nonstop2h 37m

Ontario

Tue 11/12

Nonstop2h 47m

$83

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 9/24

Nonstop2h 49m

Ontario

Sat 9/28

Nonstop2h 51m

$137

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Fri 9/20

Nonstop2h 35m

Ontario

Wed 9/25

Nonstop2h 38m

$147

Flights are sorted by cheapest first

Deals found on 7/24

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 July 25, 2024.
The best time to book flights from Seattle to Ontario is 73 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.
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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 July 21, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
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.
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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.

Temperature and rainfall in Ontario by month

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

LAX

Temperature

57.2 - 73.4 °F

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 July 25, 2024.
Read through reviews of airlines operating flights from Seattle to Ontario, such as Frontier, Alaska Airlines and United Airlines. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.1
Very good
9,365 reviews

Boarding

8.2

Food

7.2

Crew

8.6

Entertainment

7.2

Overall

8.1

Comfort

7.9

Reviews

1 / 10

There was no announcement to close your windows and were turning out the lights!.

Alaska Airlines
8.1
Very good
9,365 reviews
Alaska Airlines
8.1
Very good
9,365 reviews

Boarding

8.2

Food

7.2

Crew

8.6

Entertainment

7.2

Overall

8.1

Comfort

7.9

Reviews

1 / 10

There was no announcement to close your windows and were turning out the lights!.

Delta
8.0
Very good
9,630 reviews
Alaska Airlines
8.1
Very good
9,365 reviews

Boarding

8.2

Food

7.2

Crew

8.6

Entertainment

7.2

Overall

8.1

Comfort

7.9

Reviews

1 / 10

There was no announcement to close your windows and were turning out the lights!.

United Airlines
7.4
Good
10,000 reviews
Alaska Airlines
8.1
Very good
9,365 reviews

Boarding

8.2

Food

7.2

Crew

8.6

Entertainment

7.2

Overall

8.1

Comfort

7.9

Reviews

1 / 10

There was no announcement to close your windows and were turning out the lights!.

American Airlines
7.3
Good
10,000 reviews
Alaska Airlines
8.1
Very good
9,365 reviews

Boarding

8.2

Food

7.2

Crew

8.6

Entertainment

7.2

Overall

8.1

Comfort

7.9

Reviews

1 / 10

There was no announcement to close your windows and were turning out the lights!.

Frontier
6.2
Okay
3,835 reviews
Alaska Airlines
8.1
Very good
9,365 reviews

Boarding

8.2

Food

7.2

Crew

8.6

Entertainment

7.2

Overall

8.1

Comfort

7.9

Reviews

1 / 10

There was no announcement to close your windows and were turning out the lights!.

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 34m for a nonstop flight. You can also purchase a plane ticket from 7 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 $58, but on average you can expect to pay $88.

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

    Cheapflights has at least 20 direct flights from Seattle to Ontario under $100. A good price for a nonstop flight from Seattle to Ontario is less than $88.

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

    There are currently 20+ 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: Sunday, Monday, Tuesday, Thursday, Friday, Saturday.

  • How popular is this Seattle to Ontario flight route?

    This flight path from Seattle/Tacoma Intl to Ontario was viewed by 56 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    Travelers can expect 25 flights from Seattle to Ontario on average per day.
    Morning (6am - Noon) - 20% of flight departures
    Afternoon (Noon - 6pm) - 52% of flight departures
    Evening (6pm - Midnight) - 28% of flight departures

  • How long is the flight from Seattle to Ontario?

    A quick flight from Seattle to Ontario can take about 2h 37m. Frontier provides one of the quickest options available for as low as $58. The distance from Seattle to Ontario is about 962 mi. Generally, flights for this route are nonstop.

  • What is the cheapest airline to fly 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 $58 on this airline. Frontier is priced at 71% lower than the current average price of a flight leaving 3 months from now.

  • 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( 93%).

  • What are the cheapest flights from Seattle to Ontario?

    Looking at all options, your cheapest flight can be booked for $49. While the most popular route (Seattle/Tacoma Intl - Ontario) can be booked for $98 on average our data indicates $311 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 7/25.

  • What are the most popular airlines that fly from Seattle to Ontario?

    American Airlines, Alaska Airlines and Delta are the most popular airlines when flying from Seattle to Ontario.

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

    Currently, October is the cheapest month in which you can book a flight from Seattle to Ontario (average of $237). Flying from Seattle to Ontario in July is currently the most expensive (average of $293). 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.

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Top 6 airlines flying from Seattle to Ontario

Discover the top 6 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 2,752,877 searches. Data last updated July 25, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$36Average$127FlexibilityNo cancel feeOn-time65%
FrontierCheapest$50Average$122FlexibilityNo cancel feeOn-time62%
DeltaCheapest$78Average$238FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$84Average$236FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$198Average$254FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$256Average$316FlexibilityNo cancel feeOn-time71%
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Search flights from Seattle to Ontario by cabin class

Find flights from Seattle to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
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Prem Econ Class
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Hourly flight availability from Seattle to Ontario

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 July 25, 2024.
1%of flight departuresEarly morningMidnight to 6 am
24%of flight departuresMorning6 am to noon
40%of flight departuresAfternoonNoon to 6 pm
35%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

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 July 25, 2024.
Sunday15daily flights
Monday16daily flights
Tuesday11daily flights
Wednesday10daily flights
Thursday14daily flights
Friday16daily flights
Saturday13daily flights

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