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Cheap flights from Ontario to Seattle (ONT - SEA) 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 5/22. 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.
ONT — SEA
Apr 24 — May 11
From?
To?
Wed 4/24
Wed 5/1
1 adult, Economy
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The best prices from Ontario to Seattle/Tacoma Intl are usually found in January or October, booked 60 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

Cheap flight deals from Ontario to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Seattle (SEA). 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 19, 2024.

Popular in

June

Cheapest in

January

Round-trip from

$245

One-way from

$34
High demand for flights, 17% potential price rise
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Best time to find cheap flights, 21% potential price drop
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From Ontario to Seattle/Tacoma Intl
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One-way flight from Ontario to Seattle/Tacoma Intl
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What is the cheapest day to fly round-trip from Ontario to Seattle?

Flights from Ontario to Seattle are found to be more expensive on Saturday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Seattle.

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

Users have found that booking a flight from Ontario to Seattle at least 25 days early can save you up to 78% on average compared to booking a flight this week. If booking 25 days before your flight isn’t an option for you, users have found flights from Ontario to Seattle 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 Ontario to Seattle?

October can be a great time to fly to Seattle from Ontario with a flight ticket averaging about $222. Cheapflights users have found deals in the month of October for as cheap as $69. The most expensive prices can be found in the month of December.

When is the cheapest time to fly from Ontario to Seattle (ONT - SEA)?

It’s typically best to fly out from Ontario to Seattle in the evening. Doing so could potentially save you 18% on the flight price compared to flying at noon, which is usually more expensive.

Cheap Frontier flights from Ontario to Seattle

Explore cheap flight options specifically provided by Frontier for the route between Ontario and Seattle. 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 3,192,047 searches. Data last updated April 19, 2024.
Take a peek at the cheapest Frontier flights we've detected traveling from Ontario to Seattle. It's recommended that users confirm their flight details before booking.
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Tue 5/211:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$68
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Sat 5/251:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$73
Thu 5/1610:39 amONT - SEA
Nonstop2h 53mFrontier
Sat 5/181:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$78
Mon 5/2010:14 amONT - SEA
Nonstop2h 53mFrontier
Wed 5/221:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$79
Wed 8/149:50 amONT - SEA
Nonstop2h 47mFrontier
Wed 8/211:37 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 4/18$80
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Sun 5/192:25 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$82
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Sun 5/262:25 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$83
Wed 8/289:50 amONT - SEA
Nonstop2h 47mFrontier
Wed 9/41:37 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 4/18$84
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Mon 5/208:00 pmSEA - ONT
1 stop13h 04mFrontier
Deal found 4/18$85

  • One of the most popular airlines traveling from Ontario to Seattle is Frontier. Flights from Frontier traveling this route typically cost $218.72 RT. This price is typically 31% cheaper than other airlines that offer Ontario to Seattle flights. When booking this route, the cheapest RT price found was $90. Ontario Airport is the most common Ontario airport to take off from when flying to Seattle. Seattle/Tacoma Intl Airport is the most popular arrival airport in Seattle. When flying from Ontario to Seattle, Frontier flights are 11% more popular than any other airline flying that same route.

Cheap Delta flights from Ontario to Seattle

Explore cheap flight options specifically provided by Delta for the route between Ontario and Seattle. 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 3,192,047 searches. Data last updated April 19, 2024.
Some of the lowest-priced Delta flights we've found at this time heading from Ontario to Seattle. If these deals don't fit your criteria, make sure to check back soon as new deals are always added.
Tue 5/146:42 pmONT - SEA
Nonstop3h 02mDelta
Wed 5/227:25 amSEA - ONT
Nonstop2h 39mDelta
Deal found 4/18$177
Sat 6/811:55 amONT - SEA
Nonstop2h 45mDelta
Sat 6/157:10 amSEA - ONT
1 stop5h 07mDelta
Deal found 4/18$226
Sun 4/287:00 amONT - SEA
Nonstop2h 55mDelta
Thu 5/97:25 amSEA - ONT
Nonstop2h 39mDelta
Deal found 4/17$262
Mon 4/295:19 pmONT - SEA
1 stop7h 15mDelta
Thu 5/97:55 pmSEA - ONT
Nonstop2h 43mDelta
Deal found 4/18$271
Thu 4/2511:20 amONT - SEA
Nonstop2h 59mDelta
Thu 4/257:59 pmSEA - ONT
Nonstop2h 41mDelta
Deal found 4/18$352
Wed 4/245:45 amONT - SEA
1 stop6h 41mDelta
Wed 4/247:59 pmSEA - ONT
Nonstop2h 41mDelta
Deal found 4/17$361
Mon 4/295:19 pmONT - SEA
1 stop5h 19mDelta
Tue 4/307:55 amSEA - ONT
Nonstop2h 45mDelta
Deal found 4/18$386
Wed 4/242:00 pmONT - SEA
Nonstop2h 55mDelta
Mon 4/297:59 pmSEA - ONT
Nonstop2h 41mDelta
Deal found 4/18$402
Sun 4/287:00 amONT - SEA
Nonstop2h 55mDelta
Fri 5/37:00 pmSEA - ONT
1 stop4h 59mDelta
Deal found 4/17$486

  • One of the most popular airlines traveling from Ontario to Seattle is Delta. Flights from Delta traveling this route typically cost $212.48 RT. This price is typically 83% cheaper than other airlines that offer Ontario to Seattle flights. When booking this route, the cheapest RT price found was $79. Ontario Airport is the most common Ontario airport to take off from when flying to Seattle. Seattle/Tacoma Intl Airport is the most popular arrival airport in Seattle. When flying from Ontario to Seattle, Delta flights are 10% more popular than any other airline flying that same route.

Cheap Ontario to Seattle flights in April & May 2024

Find cheap flight options from Ontario to Seattle specifically for the months of April and May 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,192,047 searches. Prices were last updated on April 19, 2024.
Listed are some of the best fares we've found on flights departing from Ontario to Seattle in 2024. For more flight deals, be sure to check back very soon.
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Tue 5/211:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$68
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Sat 5/251:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$73
Thu 5/1610:39 amONT - SEA
Nonstop2h 53mFrontier
Sat 5/181:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$78
Mon 5/2010:14 amONT - SEA
Nonstop2h 53mFrontier
Wed 5/221:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$79
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Sun 5/192:25 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$82
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Sun 5/262:25 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$83
Fri 5/1710:24 amONT - SEA
Nonstop2h 53mFrontier
Sat 5/251:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$84
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Mon 5/208:00 pmSEA - ONT
1 stop13h 04mFrontier
Deal found 4/18$85
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Tue 5/218:14 pmSEA - ONT
1 stop17h 20mFrontier
Deal found 4/18$86

Ontario to Seattle 2024 flight deals

Discover exclusive flight deals for travel between Ontario and Seattle in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,192,047 searches. Data last updated April 19, 2024.
Listed are some of the best fares we've found on flights departing from Ontario to Seattle in 2024. For more flight deals, be sure to check back very soon.
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Tue 5/211:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$68
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Sat 5/251:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$73
Thu 5/1610:39 amONT - SEA
Nonstop2h 53mFrontier
Sat 5/181:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$78
Mon 5/2010:14 amONT - SEA
Nonstop2h 53mFrontier
Wed 5/221:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$79
Wed 8/149:50 amONT - SEA
Nonstop2h 47mFrontier
Wed 8/211:37 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 4/18$80
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Sun 5/192:25 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$82
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Sun 5/262:25 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$83
Wed 8/289:50 amONT - SEA
Nonstop2h 47mFrontier
Wed 9/41:37 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 4/18$84
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Mon 5/208:00 pmSEA - ONT
1 stop13h 04mFrontier
Deal found 4/18$85

Non-stop flights to Seattle from Ontario

Discover non-stop flight options from Ontario to Seattle. 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 3,192,047 searches. Data last updated April 19, 2024.
For a quicker trip, book one of these direct flights from Ontario to Seattle. Select from other flights from Ontario to Seattle by using the search form above.
Mon 5/2010:14 amONT - SEA
Nonstop2h 53mFrontier
Wed 5/221:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$79
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Sun 5/192:25 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$82
Sat 5/1810:04 amONT - SEA
Nonstop2h 53mFrontier
Sun 5/262:25 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$83
Fri 5/1710:24 amONT - SEA
Nonstop2h 53mFrontier
Sat 5/251:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$84
Wed 7/109:50 amONT - SEA
Nonstop2h 47mFrontier
Wed 7/171:37 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 4/19$87
Fri 5/3110:24 amONT - SEA
Nonstop2h 53mFrontier
Sat 6/11:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$88
Fri 5/1710:24 amONT - SEA
Nonstop2h 53mFrontier
Mon 5/201:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$89
Thu 5/1610:39 amONT - SEA
Nonstop2h 53mFrontier
Tue 5/281:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$92
Thu 5/1610:39 amONT - SEA
Nonstop2h 53mFrontier
Sun 5/262:25 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$93

Ontario to Seattle flights leaving soon

Find last-minute flight options from Ontario to Seattle 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 3,192,047 searches. Data last updated April 19, 2024.
Have a look at some of the last-minute flights available departing from Ontario to Seattle. Users should be sure to double check the price, date, and time of their last-minute flight.
Wed 4/2410:50 pmONT - SEA
1 stop9h 45mFrontier
Sat 4/272:55 pmSEA - ONT
1 stop9h 04mFrontier
Deal found 4/19$96
Wed 4/2410:50 pmONT - SEA
1 stop9h 45mFrontier
Tue 4/3010:44 amSEA - ONT
1 stop9h 03mFrontier
Deal found 4/18$108
Wed 4/2410:50 pmONT - SEA
1 stop9h 45mFrontier
Mon 4/299:55 amSEA - ONT
1 stop12h 00mFrontier
Deal found 4/18$126
Wed 4/2410:50 pmONT - SEA
1 stop9h 45mFrontier
Sat 4/272:55 pmSEA - ONT
1 stop9h 04mFrontier
Deal found 4/18$131
Wed 4/2410:49 pmONT - SEA
1 stop17h 42mFrontier
Fri 4/266:03 pmSEA - ONT
1 stop12h 23mFrontier
Deal found 4/18$143
Thu 4/2510:59 pmONT - SEA
1 stop9h 41mFrontier
Tue 4/3010:44 amSEA - ONT
1 stop9h 03mFrontier
Deal found 4/18$144
Thu 4/2512:56 amONT - SEA
1 stop20h 38mFrontier
Tue 5/211:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 4/18$146
Mon 4/2910:55 pmONT - SEA
1 stop10h 49mFrontier
Fri 5/1010:34 pmSEA - ONT
1 stop7h 52mFrontier
Deal found 4/18$148
Fri 4/2612:55 amONT - SEA
1 stop13h 00mFrontier
Tue 4/3010:44 amSEA - ONT
1 stop9h 03mFrontier
Deal found 4/18$149

One-way flights to Seattle from Ontario

Search for one-way flight options from Ontario to Seattle. 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 3,192,047 searches. Data last updated April 19, 2024.
Users traveling one-way from Ontario to Seattle can select one of these great deals. Users in need of a round-trip flight from Ontario to Seattle instead should update the search form at the top of page.
Wed 5/2210:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/19$34
Tue 7/169:35 amONT - SEA
Nonstop2h 47mFrontier
Deal found 4/18$39
Thu 5/1610:39 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/18$44
Fri 5/1710:24 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/18$45
Tue 8/139:35 amONT - SEA
Nonstop2h 47mFrontier
Deal found 4/18$46
Wed 7/249:50 amONT - SEA
Nonstop2h 47mFrontier
Deal found 4/18$48
Thu 5/2310:34 amONT - SEA
Nonstop2h 53mFrontier
Deal found 4/17$49
Wed 4/2410:50 pmONT - SEA
1 stop9h 45mFrontier
Deal found 4/18$54
Thu 5/210:59 pmONT - SEA
1 stop9h 41mFrontier
Deal found 4/17$55

Find flights from Ontario to Seattle within your budget

Customize your flight search to find flights from Ontario to Seattle 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 3,192,047 searches. Data last updated April 19, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$68 - $186

Route

Depart

Return

Price

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Sat 5/18

Nonstop2h 53m

Seattle/Tacoma Intl

Tue 5/21

Nonstop2h 44m

$68

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Sat 5/18

Nonstop2h 53m

Seattle/Tacoma Intl

Sat 5/25

Nonstop2h 44m

$73

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Thu 5/16

Nonstop2h 53m

Seattle/Tacoma Intl

Sat 5/18

Nonstop2h 44m

$78

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Mon 5/20

Nonstop2h 53m

Seattle/Tacoma Intl

Wed 5/22

Nonstop2h 44m

$79

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Wed 8/14

Nonstop2h 47m

Seattle/Tacoma Intl

Wed 8/21

Nonstop2h 37m

$80

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Sat 5/18

Nonstop2h 53m

Seattle/Tacoma Intl

Sun 5/19

Nonstop2h 44m

$82

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Thu 5/30

Nonstop2h 53m

Seattle/Tacoma Intl

Sun 6/2

Nonstop2h 33m

$163

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Tue 5/14

Nonstop3h 02m

Seattle/Tacoma Intl

Wed 5/22

Nonstop2h 39m

$177

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Tue 5/14

1 stop4h 41m

Seattle/Tacoma Intl

Wed 5/15

Nonstop2h 33m

$186

Flights are sorted by cheapest first

Deals found on 4/18

When is the best time to book a flight from Ontario to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Seattle. Price data was last updated on January 28, 2024.
To ensure you get the cheapest price possible for a flight from Ontario to Seattle, you should look to book at least 60 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
Search Deals

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

Use this chart to determine the cheapest time to fly round-trip from Ontario to Seattle. Price data was last updated on April 14, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Ontario to Seattle 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.
Search Deals

Average price of flights to Seattle by month

Plan your trip from Ontario to Seattle by taking into account the cheapest months to travel. The average price of a one-way flight from Ontario to Seattle is currently $46 while a round-trip flight costs $110. Price data was last updated on April 14, 2024.

Currently, December is the cheapest month in which you can book a flight from Ontario to Seattle (average of $245). Flying from Ontario to Seattle in June is currently the most expensive (average of $408). 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

$247

February

$254

March

$288

April

$291

May

$319

June

$408

July

$406

August

$343

September

$278

October

$256

November

$258

December

$245

Temperature and rainfall in Seattle by month

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

SEA

Temperature

41 - 66.2 °F

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated April 19, 2024.
Read reviews from past customers who have flown Frontier, Delta and Alaska Airlines from Ontario to Seattle. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.1
Very good
9,108 reviews
Check prices

Crew

8.6

Overall

8.1

Entertainment

7.3

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

Alaska Airlines
8.1
Very good
9,108 reviews
Alaska Airlines
8.1
Very good
9,108 reviews
Check prices

Crew

8.6

Overall

8.1

Entertainment

7.3

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

Delta
8.1
Very good
11,094 reviews
Alaska Airlines
8.1
Very good
9,108 reviews
Check prices

Crew

8.6

Overall

8.1

Entertainment

7.3

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

United Airlines
7.4
Good
11,333 reviews
Alaska Airlines
8.1
Very good
9,108 reviews
Check prices

Crew

8.6

Overall

8.1

Entertainment

7.3

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

American Airlines
7.3
Good
14,954 reviews
Alaska Airlines
8.1
Very good
9,108 reviews
Check prices

Crew

8.6

Overall

8.1

Entertainment

7.3

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

Frontier
6.3
Okay
4,163 reviews
Alaska Airlines
8.1
Very good
9,108 reviews
Check prices

Crew

8.6

Overall

8.1

Entertainment

7.3

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 10

There were no major issues. A bit of delay but it was understandable. It was a good experience otherwise.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Seattle. 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 Ontario to Seattle?

    If you wish to fly to Seattle from Ontario, then you need to book flights from Ontario to Seattle/Tacoma Intl. There are 12 flights from Ontario (ONT) to Seattle/Tacoma Intl (SEA) per day to choose from. Flights to Seattle from Ontario are available from 8 different airlines, which means you should have some options if you want to compare airfare deals. 2h 35m is how long a nonstop flight from Ontario to Seattle/Tacoma Intl typically takes.

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

    Yes, there are multiple flights from Ontario to Seattle for under $100. The cheapest flight booked recently is on Frontier for just $68, but on average you can expect to pay $85.

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

    Cheapflights has at least 20 direct flights from Ontario to Seattle under $100. A good price for a nonstop flight from Ontario to Seattle is less than $95.

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

    There are currently 20+ open flights from Ontario to Seattle within the next 7 days for less than $100.

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

    Nonstop flights are available for this route on the following days: Sunday, Monday, Tuesday, Wednesday, Friday, Saturday.

  • How popular is this Ontario to Seattle flight route?

    The Ontario to Seattle/Tacoma Intl flight path was viewed by 77 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 Ontario to Seattle on average per day?

    On average 16 flights depart from Ontario to Seattle per day.
    Early Morning (Midnight to 6am) - 31% of flight departures
    Morning (6am - Noon) - 19% of flight departures
    Afternoon (Noon - 6pm) - 31% of flight departures
    Evening (6pm - Midnight) - 19% of flight departures

  • How long is the flight from Ontario to Seattle?

    There are many flights that can get you from Ontario to Seattle in 2h 53m. Fly via Frontier to get the fastest option. There are 962 mi between Ontario and Seattle. Most flights are nonstop.

  • What is the cheapest airline to fly from Ontario to Seattle round-trip?

    Cheapflights users have booked flights from Ontario to Seattle round-trip from $68. You may be able to fly from Ontario to Seattle for 68% less than the average price by searching for this airline.

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

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

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

    Consider Air France (100%), Qatar Airways (95%) or Japan Airlines (95%) when booking your flight. These represent the most reliable airlines when flying from Ontario to Seattle.

  • What are the cheapest flights from Ontario to Seattle?

    While on average a flight from Ontario to Seattle is generally $504, our data shows the cheapest flight currently is $60. When looking at the most popular route, (Ontario - Seattle/Tacoma Intl), you can expect to pay $80 for that flight.

  • What does ONT to SEA mean?

    Great question - ONT to SEA just means Ontario Airport to Seattle/Tacoma Intl Airport. Now you’ll know what these unique codes when you look for flights!

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

    The amount of baggage you can bring on your Ontario to Seattle 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 Ontario to Seattle with specific airlines?

    Yes, Cheapflights allows you to browse and filter Ontario to Seattle 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 Ontario to Seattle that include hotel bookings?

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Seattle 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 Ontario to Seattle that allow pets onboard?

    Many airlines flying from Ontario to Seattle 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 Ontario to Seattle?

    Yes, you can often find last-minute deals on Ontario to Seattle 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 Ontario to Seattle flight deals updated?

    The Ontario to Seattle flight deals you see on this page were last updated on 4/18.

See more FAQs

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Fly from Ontario to Seattle on these airlines
Choose from the following airlines for your flight from Ontario to Seattle. Flights are based on user searches made on Cheapflights and were last updated on April 19, 2024.

Alaska Airlines flights from Ontario to Seattle/Tacoma Intl
Delta flights from Ontario to Seattle/Tacoma Intl
Frontier flights from Ontario to Seattle/Tacoma Intl

Top 7 airlines flying from Ontario to Seattle

Discover the top 7 airlines that operate flights from Ontario to Seattle. 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 3,192,047 searches. Data last updated April 19, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$67Average$155FlexibilityNo cancel feeOn-time62%
Search Frontier flights
JetBlueCheapest$69Average$165FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
DeltaCheapest$79Average$212FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapest$90Average$219FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Spirit AirlinesCheapest$99Average$171FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
United AirlinesCheapest$164Average$252FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest$270Average$338FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
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Search flights from Ontario to Seattle by cabin class

Find flights from Ontario to Seattle, 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 Ontario to Seattle

Find hourly flight availability from Ontario to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 19, 2024.
28%of flight departuresEarly morningMidnight to 6 am
41%of flight departuresMorning6 am to noon
30%of flight departuresAfternoonNoon to 6 pm
1%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from Ontario to Seattle

Explore weekly flight availability from Ontario to Seattle. 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 19, 2024.
Sunday14daily flights
Monday15daily flights
Tuesday11daily flights
Wednesday10daily flights
Thursday12daily flights
Friday15daily flights
Saturday9daily flights

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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario to Seattle. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

Cheapflights helps you find that perfect flight to Seattle from Ontario 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 Ontario to Seattle with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Ontario to Seattle, users can toggle the no change fees filter when performing a flight search.

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

Yes, Cheapflights offers price alerts on Ontario to Seattle flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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