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Cheap flights from Seattle to Ontario (SEA - ONT) from $34

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 5/18. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
SEA — ONT
Apr 29 — May 61
From?
To?
Mon 4/29
Mon 5/6
1 adult, Economy
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The best prices from Seattle/Tacoma Intl to Ontario are usually found in September or October, booked 53 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 April 24, 2024.

Popular in

November

Cheapest in

September

Round-trip from

$238

One-way from

$34
High demand for flights, 11% potential price rise
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Best time to find cheap flights, 22% 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 56 days early can save you up to 87% on average compared to booking a flight this week. If booking 56 days before your flight isn’t an option for you, users have found flights from Seattle to Ontario for as little as $279 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 $403 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 December. Prices are generally better when you fly from Seattle to Ontario in September, with the cheapest ticket starting at $69.

When is the cheapest time to fly from Seattle to Ontario (SEA - 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 22% on your trip compared to booking a flight in the afternoon.

Cheap Frontier flights from Seattle to Ontario

Explore cheap flight options specifically provided by Frontier for the route between Seattle and Ontario. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 3,073,952 searches. Data last updated April 24, 2024.
Take a look at some of the lowest-priced Frontier flights heading from Seattle to Ontario. Deals update often to give you more flight options matching your criteria
Wed 5/221:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2910:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/22$43
Tue 5/211:57 pmSEA - ONT
Nonstop2h 44mFrontier
Sat 5/2510:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/22$61
Sat 5/181:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2210:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/24$68
Wed 5/221:57 pmSEA - ONT
Nonstop2h 44mFrontier
Thu 5/3010:34 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/22$71
Tue 5/211:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2910:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$73
Mon 5/201:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2910:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$76
Sat 5/251:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2910:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$78
Wed 7/101:37 pmSEA - ONT
Nonstop2h 37mFrontier
Tue 7/169:35 amONT - SEA
Nonstop2h 47mFrontier
Deal found 4/23$79
Sat 5/181:57 pmSEA - ONT
Nonstop2h 44mFrontier
Mon 5/2010:14 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$80

  • One of the most popular airlines traveling from Seattle to Ontario is Frontier. Flights from Frontier traveling this route typically cost $217.81 RT. This price is typically 20% cheaper than other airlines that offer Seattle to Ontario flights. When booking this route, the cheapest RT price found was $78. Seattle/Tacoma Intl Airport is the most common Seattle airport to take off from when flying to Ontario. Ontario Airport is the most popular arrival airport in Ontario. When flying from Seattle to Ontario, Frontier flights are 11% more popular than any other airline flying that same route.

Cheap Alaska Airlines flights from Seattle to Ontario

Explore cheap flight options specifically provided by Alaska Airlines for the route between Seattle and Ontario. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 3,073,952 searches. Data last updated April 24, 2024.
Take a gander at the lowest prices we've found on Alaska Airlines flights from Seattle to Ontario. Check back soon if you're not seeing flights that suit your needs.
Tue 4/301:32 pmSEA - ONT
Nonstop2h 33mAlaska Airlines
Fri 5/318:09 pmONT - SEA
Nonstop2h 41mAlaska Airlines
Deal found 4/23$262
Thu 5/21:32 pmSEA - ONT
Nonstop2h 33mAlaska Airlines
Thu 5/27:59 pmONT - SEA
Nonstop2h 38mAlaska Airlines
Deal found 4/23$301
Wed 5/11:32 pmSEA - ONT
Nonstop2h 33mAlaska Airlines
Sat 5/115:00 pmONT - SEA
Nonstop2h 38mAlaska Airlines
Deal found 4/23$302
Thu 5/29:26 pmSEA - ONT
Nonstop2h 33mAlaska Airlines
Sun 5/57:59 pmONT - SEA
Nonstop2h 38mAlaska Airlines
Deal found 4/23$307
Wed 5/11:32 pmSEA - ONT
Nonstop2h 33mAlaska Airlines
Sat 5/117:00 amONT - SEA
1 stop4h 41mAlaska Airlines
Deal found 4/23$311
Fri 5/32:50 pmSEA - ONT
1 stop7h 03mAlaska Airlines
Sun 5/57:59 pmONT - SEA
Nonstop2h 38mAlaska Airlines
Deal found 4/23$316
Sat 5/46:55 pmSEA - ONT
Nonstop2h 33mAlaska Airlines
Tue 5/77:00 amONT - SEA
1 stop4h 41mAlaska Airlines
Deal found 4/23$321
Fri 5/39:26 pmSEA - ONT
Nonstop2h 33mAlaska Airlines
Mon 5/206:00 amONT - SEA
Nonstop2h 45mAlaska Airlines
Deal found 4/23$324
Wed 5/16:55 pmSEA - ONT
Nonstop2h 33mAlaska Airlines
Fri 5/37:59 pmONT - SEA
Nonstop2h 38mAlaska Airlines
Deal found 4/24$327

  • Alaska Airlines is one of the most popular airlines used for those traveling from Seattle to Ontario. Flights on this route from Alaska Airlines typically cost $226.19 RT, a price that is 116% cheaper than the average Seattle to Ontario flight. The cheapest flight found was $84 RT. Seattle/Tacoma Intl Airport is the most common Seattle airport to take off from when flying to Ontario. Ontario Airport is the most popular arrival airport in Ontario. When flying from Seattle to Ontario, Alaska Airlines flights are 11% more popular than any other airline flying that same route.

Cheap Seattle to Ontario flights in April & May 2024

Find cheap flight options from Seattle to Ontario specifically for the months of April and May 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,073,952 searches. Prices were last updated on April 24, 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.
Wed 5/221:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2910:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/22$43
Tue 5/211:57 pmSEA - ONT
Nonstop2h 44mFrontier
Sat 5/2510:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/22$61
Sat 5/181:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2210:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/24$68
Wed 5/221:57 pmSEA - ONT
Nonstop2h 44mFrontier
Thu 5/3010:34 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/22$71
Tue 5/211:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2910:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$73
Mon 5/201:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2910:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$76
Sat 5/251:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2910:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$78
Sat 5/181:57 pmSEA - ONT
Nonstop2h 44mFrontier
Mon 5/2010:14 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$80
Sat 5/181:57 pmSEA - ONT
Nonstop2h 44mFrontier
Sat 5/2510:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/24$82

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 3,073,952 searches. Data last updated April 24, 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.
Wed 5/221:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2910:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/22$43
Tue 5/211:57 pmSEA - ONT
Nonstop2h 44mFrontier
Sat 5/2510:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/22$61
Sat 5/181:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2210:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/24$68
Wed 5/221:57 pmSEA - ONT
Nonstop2h 44mFrontier
Thu 5/3010:34 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/22$71
Tue 5/211:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2910:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$73
Mon 5/201:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2910:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$76
Sat 5/251:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2910:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$78
Wed 7/101:37 pmSEA - ONT
Nonstop2h 37mFrontier
Tue 7/169:35 amONT - SEA
Nonstop2h 47mFrontier
Deal found 4/23$79
Sat 5/181:57 pmSEA - ONT
Nonstop2h 44mFrontier
Mon 5/2010:14 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$80

Non-stop flights to Ontario from Seattle

Discover non-stop flight options from Seattle to Ontario. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 3,073,952 searches. Data last updated April 24, 2024.
For a quicker trip, book one of these direct flights from Seattle to Ontario. Select from other flights from Seattle to Ontario by using the search form above.
Sat 5/251:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 5/2910:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$78
Wed 7/101:37 pmSEA - ONT
Nonstop2h 37mFrontier
Tue 7/169:35 amONT - SEA
Nonstop2h 47mFrontier
Deal found 4/23$79
Sat 5/181:57 pmSEA - ONT
Nonstop2h 44mFrontier
Mon 5/2010:14 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$80
Sat 5/181:57 pmSEA - ONT
Nonstop2h 44mFrontier
Sat 5/2510:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/24$82
Sat 5/181:57 pmSEA - ONT
Nonstop2h 44mFrontier
Thu 5/3010:34 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/22$83
Wed 6/51:57 pmSEA - ONT
Nonstop2h 44mFrontier
Wed 6/1210:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$87
Fri 5/242:17 pmSEA - ONT
Nonstop2h 44mFrontier
Tue 5/2810:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$88
Thu 5/162:32 pmSEA - ONT
Nonstop2h 44mFrontier
Mon 5/2010:14 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$89
Sat 5/181:57 pmSEA - ONT
Nonstop2h 44mFrontier
Sun 5/1910:32 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/23$91

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 3,073,952 searches. Data last updated April 24, 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.
Sat 5/42:55 pmSEA - ONT
1 stop9h 04mFrontier
Tue 5/78:48 pmONT - SEA
1 stop12h 07mFrontier
Deal found 4/23$109
Sat 5/49:32 pmSEA - ONT
1 stop8h 59mFrontier
Wed 5/810:49 pmONT - SEA
1 stop17h 42mFrontier
Deal found 4/23$110
Wed 5/19:55 amSEA - ONT
1 stop12h 05mFrontier
Wed 5/2910:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/24$119
Wed 5/19:55 amSEA - ONT
1 stop12h 05mFrontier
Tue 5/78:48 pmONT - SEA
1 stop12h 07mFrontier
Deal found 4/23$121
Sat 5/42:55 pmSEA - ONT
1 stop9h 04mFrontier
Mon 5/611:07 pmONT - SEA
1 stop10h 37mFrontier
Deal found 4/23$122
Tue 4/3010:44 amSEA - ONT
1 stop9h 03mFrontier
Wed 5/17:41 pmONT - SEA
1 stop20h 50mFrontier
Deal found 4/23$130
Sat 5/42:55 pmSEA - ONT
1 stop15h 36mFrontier
Sat 5/1110:57 pmONT - SEA
1 stop9h 38mFrontier
Deal found 4/24$133
Sat 5/42:55 pmSEA - ONT
1 stop9h 04mFrontier
Sat 5/1110:57 pmONT - SEA
1 stop9h 38mFrontier
Deal found 4/23$135
Wed 5/19:55 amSEA - ONT
1 stop12h 05mFrontier
Fri 5/1010:29 pmONT - SEA
1 stop10h 51mFrontier
Deal found 4/24$137

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 3,073,952 searches. Data last updated April 24, 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.
Sat 5/181:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/23$34
Sat 5/251:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/23$39
Sat 6/11:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/23$40
Tue 5/79:35 pmSEA - ONT
1 stop8h 51mFrontier
Deal found 4/23$43
Fri 5/172:17 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/23$44
Fri 5/172:17 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/23$45
Tue 8/131:22 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 4/23$46
Tue 5/281:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/23$48
Fri 6/71:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/23$49

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 3,073,952 searches. Data last updated April 24, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$43 - $197

Route

Depart

Return

Price

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 5/22

Nonstop2h 44m

Ontario

Wed 5/29

Nonstop2h 53m

$43

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 5/21

Nonstop2h 44m

Ontario

Sat 5/25

Nonstop2h 53m

$61

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 5/18

Nonstop2h 44m

Ontario

Wed 5/22

Nonstop2h 53m

$68

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 5/22

Nonstop2h 44m

Ontario

Thu 5/30

Nonstop2h 53m

$71

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 5/21

Nonstop2h 44m

Ontario

Wed 5/29

Nonstop2h 53m

$73

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Mon 5/20

Nonstop2h 44m

Ontario

Wed 5/29

Nonstop2h 53m

$76

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 5/18

Nonstop2h 44m

Ontario

Mon 5/20

Nonstop2h 53m

$95

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 5/14

Nonstop2h 33m

Ontario

Thu 5/16

Nonstop2h 53m

$138

Seattle/Tacoma IntlOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 5/15

Nonstop2h 39m

Ontario

Mon 5/20

Nonstop3h 00m

$197

Flights are sorted by cheapest first

Deals found on 4/22

When is the best time to 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 January 28, 2024.
The best time to book flights from Seattle to Ontario is 53 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.
Search Deals

When is the cheapest time 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 April 21, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Seattle to Ontario flight should consider departing on Friday 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.
Search Deals

Average price of flights to Ontario by month

Plan your trip from Seattle to Ontario by taking into account the cheapest months to travel. The average price of a one-way flight from Seattle to Ontario is currently $43 while a round-trip flight costs $91. Price data was last updated on April 21, 2024.

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 June is currently the most expensive (average of $346). 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.

January

$270

February

$287

March

$281

April

$258

May

$271

June

$346

July

$335

August

$287

September

$258

October

$237

November

$268

December

$271

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

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 April 24, 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.
Alaska Airlines
8.1
Very good
9,110 reviews
Check prices

Crew

8.6

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Food

7.3

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

Alaska Airlines
8.1
Very good
9,110 reviews
Alaska Airlines
8.1
Very good
9,110 reviews
Check prices

Crew

8.6

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Food

7.3

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

Delta
8.1
Very good
11,004 reviews
Alaska Airlines
8.1
Very good
9,110 reviews
Check prices

Crew

8.6

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Food

7.3

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

United Airlines
7.4
Good
11,255 reviews
Alaska Airlines
8.1
Very good
9,110 reviews
Check prices

Crew

8.6

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Food

7.3

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

American Airlines
7.3
Good
14,898 reviews
Alaska Airlines
8.1
Very good
9,110 reviews
Check prices

Crew

8.6

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Food

7.3

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

Frontier
6.3
Okay
4,139 reviews
Alaska Airlines
8.1
Very good
9,110 reviews
Check prices

Crew

8.6

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Food

7.3

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

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 33m 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 $43, but on average you can expect to pay $80.

  • 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 $91.

  • Are there last-minute flights available from Seattle to Ontario for under $200?

    There are currently 20+ open flights from Seattle to Ontario within the next 7 days for less than $200.

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

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

  • How popular is this Seattle to Ontario flight route?

    This flight path from Seattle/Tacoma Intl to Ontario was viewed by 28 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 21 flights from Seattle to Ontario on average per day.
    Morning (6am - Noon) - 5% of flight departures
    Afternoon (Noon - 6pm) - 86% of flight departures
    Evening (6pm - Midnight) - 10% of flight departures

  • How long is the flight from Seattle to Ontario?

    A quick flight from Seattle to Ontario can take about 2h 44m. Frontier provides one of the quickest options available for as low as $43. 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 $43 on this airline. An additional option worth looking into is CitizenPlane, starting at $95. Frontier is priced at 79% lower than the current average price of a flight leaving 3 months from now.

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

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

  • 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: WestJet (100%), Korean Air (89%), KLM( 88%).

  • What are the cheapest flights from Seattle to Ontario?

    Looking at all options, your cheapest flight can be booked for $39. While the most popular route (Seattle/Tacoma Intl - Ontario) can be booked for $81 on average our data indicates $344 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 4/24.

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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 3,073,952 searches. Data last updated April 24, 2024.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$49Average$231FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FrontierCheapest$58Average$117FlexibilityNo cancel feeOn-time62%
Search Frontier flights
Spirit AirlinesCheapest$75Average$193FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
DeltaCheapest$78Average$218FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapest$84Average$226FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
American AirlinesCheapest$256Average$316FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
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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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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 April 24, 2024.
2%of flight departuresEarly morningMidnight to 6 am
18%of flight departuresMorning6 am to noon
33%of flight departuresAfternoonNoon to 6 pm
47%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 April 24, 2024.
Sunday15daily flights
Monday16daily flights
Tuesday11daily flights
Wednesday10daily flights
Thursday14daily flights
Friday16daily flights
Saturday13daily flights

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Fly with Cheapflights

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How does Cheapflights help users find flights from Seattle to Ontario?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Ontario from Seattle today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Seattle to Ontario?

Cheapflights helps you find that perfect flight to Ontario from Seattle by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Seattle to Ontario with no change fees?

Need flexible booking options for your flight to Ontario from Seattle? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Ontario become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Ontario from Seattle today and book when prices fit your budget.

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