Cheap flights from Ontario to Seattle (ONT - SEA) from $49

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 6/25. 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
May 29 — Jun 51

The best prices from Ontario to Seattle/Tacoma Intl are usually found in October or September, booked 80 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 May 24, 2024.

Popular in

December

Cheapest in

October

Round-trip from

$247

One-way from

$49
High demand for flights, 14% potential price rise
Best time to find cheap flights, 19% potential price drop
From Ontario to Seattle/Tacoma Intl
One-way flight from Ontario to Seattle/Tacoma Intl

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 48 days early can save you up to 72% on average compared to booking a flight this week. If booking 48 days before your flight isn’t an option for you, users have found flights from Ontario to Seattle for as little as $266 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 $386 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 $225. 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 14% 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 2,725,499 searches. Data last updated May 24, 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.
Tue 6/119:54 amONT - SEA
Nonstop2h 53mFrontier
Tue 6/181:47 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$98
Wed 6/1210:04 amONT - SEA
Nonstop2h 53mFrontier
Tue 6/181:47 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$101
Wed 7/109:58 amONT - SEA
Nonstop2h 36mFrontier
Tue 7/161:34 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 5/23$102
Tue 7/910:08 amONT - SEA
Nonstop2h 36mFrontier
Tue 7/161:34 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 5/23$103
Tue 7/169:58 amONT - SEA
Nonstop2h 36mFrontier
Wed 7/311:34 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 5/23$105
Tue 6/410:04 amONT - SEA
Nonstop2h 53mFrontier
Tue 6/111:47 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$108
Mon 7/86:23 pmONT - SEA
Nonstop2h 36mFrontier
Wed 7/101:34 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 5/23$110
Sat 6/110:04 amONT - SEA
Nonstop2h 53mFrontier
Wed 6/121:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/22$111
Tue 7/910:08 amONT - SEA
Nonstop2h 36mFrontier
Sat 7/134:09 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 5/23$112
  • One of the most popular airlines traveling from Ontario to Seattle is Frontier. Flights from Frontier traveling this route typically cost $217.96 RT. This price is typically 45% 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, Frontier flights are 11% more popular than any other airline flying that same route.

Cheap Alaska Airlines flights from Ontario to Seattle

Explore cheap flight options specifically provided by Alaska Airlines 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 2,725,499 searches. Data last updated May 24, 2024.
Some of the lowest-priced Alaska Airlines 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.
Sat 6/228:20 pmONT - SEA
Nonstop2h 35mAlaska Airlines
Tue 6/259:26 pmSEA - ONT
Nonstop2h 33mAlaska Airlines
Deal found 5/23$177
Sat 6/228:20 pmONT - SEA
Nonstop2h 35mAlaska Airlines
Mon 6/249:26 pmSEA - ONT
Nonstop2h 33mAlaska Airlines
Deal found 5/23$197
Fri 8/98:20 pmONT - SEA
Nonstop2h 35mAlaska Airlines
Tue 8/136:45 amSEA - ONT
1 stop3h 55mAlaska Airlines
Deal found 5/22$206
Thu 7/188:20 pmONT - SEA
Nonstop2h 35mAlaska Airlines
Sun 7/216:30 amSEA - ONT
Nonstop2h 35mAlaska Airlines
Deal found 5/22$207
Sun 8/46:40 amONT - SEA
1 stop5h 52mAlaska Airlines
Mon 8/124:35 pmSEA - ONT
1 stop6h 05mAlaska Airlines
Deal found 5/23$216
Thu 6/278:20 pmONT - SEA
Nonstop2h 35mAlaska Airlines
Fri 7/56:30 amSEA - ONT
Nonstop2h 35mAlaska Airlines
Deal found 5/23$217
Thu 5/3011:00 amONT - SEA
1 stop5h 51mAlaska Airlines
Thu 6/612:56 pmSEA - ONT
Nonstop2h 30mAlaska Airlines
Deal found 5/22$341
Sat 6/16:00 amONT - SEA
Nonstop2h 45mAlaska Airlines
Sat 6/111:37 amSEA - ONT
2 stops8h 48mAlaska Airlines
Deal found 5/22$351
  • Alaska Airlines is one of the most popular airlines used for those traveling from Ontario to Seattle. Flights on this route from Alaska Airlines typically cost $222.71 RT, a price that is 80% cheaper than the average Ontario to Seattle flight. The cheapest flight found was $90 RT. 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, Alaska Airlines flights are 11% more popular than any other airline flying that same route.

Cheap Ontario to Seattle flights in May & June 2024

Find cheap flight options from Ontario to Seattle specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,725,499 searches. Prices were last updated on May 24, 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.
Tue 6/119:54 amONT - SEA
Nonstop2h 53mFrontier
Tue 6/181:47 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$98
Wed 6/1210:04 amONT - SEA
Nonstop2h 53mFrontier
Tue 6/181:47 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$101
Tue 6/410:04 amONT - SEA
Nonstop2h 53mFrontier
Tue 6/111:47 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$108
Sat 6/110:04 amONT - SEA
Nonstop2h 53mFrontier
Wed 6/121:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/22$111
Sat 6/110:04 amONT - SEA
Nonstop2h 53mFrontier
Thu 7/43:49 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$118
Sat 6/110:04 amONT - SEA
Nonstop2h 53mFrontier
Sat 6/11:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$121
Tue 6/259:54 amONT - SEA
Nonstop2h 53mFrontier
Wed 6/261:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$122
Sat 6/811:43 amONT - SEA
Nonstop2h 53mFrontier
Tue 6/111:47 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$123
Thu 6/611:56 amONT - SEA
Nonstop2h 53mFrontier
Wed 6/121:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$128

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 2,725,499 searches. Data last updated May 24, 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.
Wed 8/289:50 amONT - SEA
Nonstop2h 47mFrontier
Tue 9/31:22 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 5/23$98
Thu 9/510:06 amONT - SEA
Nonstop2h 47mFrontier
Tue 9/171:22 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 5/23$100
Wed 6/1210:04 amONT - SEA
Nonstop2h 53mFrontier
Tue 6/181:47 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$101
Wed 7/109:58 amONT - SEA
Nonstop2h 36mFrontier
Tue 7/161:34 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 5/23$102
Tue 7/910:08 amONT - SEA
Nonstop2h 36mFrontier
Tue 7/161:34 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 5/23$103
Tue 7/169:58 amONT - SEA
Nonstop2h 36mFrontier
Wed 7/311:34 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 5/23$105
Tue 6/410:04 amONT - SEA
Nonstop2h 53mFrontier
Tue 6/111:47 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$108
Fri 9/2010:06 amONT - SEA
Nonstop2h 47mFrontier
Mon 9/231:53 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 5/23$110
Sat 6/110:04 amONT - SEA
Nonstop2h 53mFrontier
Wed 6/121:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/22$111

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 2,725,499 searches. Data last updated May 24, 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.
Wed 8/289:50 amONT - SEA
Nonstop2h 47mFrontier
Wed 9/41:37 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 5/23$84
Sat 6/1511:43 amONT - SEA
Nonstop2h 53mFrontier
Sat 6/223:36 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/22$98
Thu 9/510:06 amONT - SEA
Nonstop2h 47mFrontier
Tue 9/171:22 pmSEA - ONT
Nonstop2h 37mFrontier
Deal found 5/21$100
Tue 7/29:54 amONT - SEA
Nonstop2h 53mFrontier
Tue 7/91:45 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 5/21$101
Wed 7/109:58 amONT - SEA
Nonstop2h 36mFrontier
Tue 7/161:34 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 5/22$102
Tue 7/910:08 amONT - SEA
Nonstop2h 36mFrontier
Tue 7/161:34 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 5/22$103
Tue 7/29:54 amONT - SEA
Nonstop2h 53mFrontier
Wed 7/31:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/21$104
Tue 7/239:58 amONT - SEA
Nonstop2h 36mFrontier
Tue 7/301:34 pmSEA - ONT
Nonstop2h 47mFrontier
Deal found 5/22$105
Tue 6/410:04 amONT - SEA
Nonstop2h 53mFrontier
Tue 6/111:47 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$108

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 2,725,499 searches. Data last updated May 24, 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.
Sat 6/110:04 amONT - SEA
Nonstop2h 53mFrontier
Tue 7/21:47 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$108
Wed 5/2910:04 amONT - SEA
Nonstop2h 53mFrontier
Wed 6/52:22 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/22$110
Sat 6/110:04 amONT - SEA
Nonstop2h 53mFrontier
Wed 6/121:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/22$111
Sat 6/110:04 amONT - SEA
Nonstop2h 53mFrontier
Tue 6/41:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/22$118
Sat 6/110:04 amONT - SEA
Nonstop2h 53mFrontier
Sat 6/11:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$121
Sat 6/110:04 amONT - SEA
Nonstop2h 53mFrontier
Tue 6/41:57 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$129
Sat 6/110:04 amONT - SEA
Nonstop2h 53mFrontier
Sun 6/93:44 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/22$137
Sat 6/110:04 amONT - SEA
Nonstop2h 53mFrontier
Mon 7/19:30 amSEA - ONT
Nonstop2h 39mFrontier
Deal found 5/23$138
Sat 6/110:04 amONT - SEA
Nonstop2h 53mFrontier
Sat 6/293:36 pmSEA - ONT
Nonstop2h 44mFrontier
Deal found 5/23$141

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 2,725,499 searches. Data last updated May 24, 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.
Tue 6/259:54 amONT - SEA
Nonstop2h 53mFrontier
Deal found 5/23$49
Wed 7/310:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 5/23$50
Tue 6/119:54 amONT - SEA
Nonstop2h 53mFrontier
Deal found 5/22$51
Tue 7/169:58 amONT - SEA
Nonstop2h 36mFrontier
Deal found 5/23$54
Sat 6/110:04 amONT - SEA
Nonstop2h 53mFrontier
Deal found 5/23$59
Mon 7/226:19 pmONT - SEA
Nonstop2h 36mFrontier
Deal found 5/23$63
Sat 7/1312:43 pmONT - SEA
Nonstop2h 36mFrontier
Deal found 5/23$64
Wed 6/510:29 amONT - SEA
Nonstop2h 53mFrontier
Deal found 5/23$65
Sat 6/811:43 amONT - SEA
Nonstop2h 53mFrontier
Deal found 5/22$74

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 2,725,499 searches. Data last updated May 24, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$98 - $246

Route

Depart

Return

Price

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Tue 6/11

Nonstop2h 53m

Seattle/Tacoma Intl

Tue 6/18

Nonstop2h 44m

$98

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Wed 6/12

Nonstop2h 53m

Seattle/Tacoma Intl

Tue 6/18

Nonstop2h 44m

$101

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Wed 7/10

Nonstop2h 36m

Seattle/Tacoma Intl

Tue 7/16

Nonstop2h 47m

$102

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Tue 7/9

Nonstop2h 36m

Seattle/Tacoma Intl

Tue 7/16

Nonstop2h 47m

$103

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Tue 7/16

Nonstop2h 36m

Seattle/Tacoma Intl

Wed 7/31

Nonstop2h 47m

$105

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Tue 6/4

Nonstop2h 53m

Seattle/Tacoma Intl

Tue 6/11

Nonstop2h 44m

$108

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Wed 7/10

Nonstop2h 36m

Seattle/Tacoma Intl

Fri 7/19

Nonstop2h 33m

$155

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Sat 6/22

Nonstop2h 35m

Seattle/Tacoma Intl

Tue 6/25

Nonstop2h 33m

$177

OntarioSeattle/Tacoma Intl

ONT - SEA

ONTSEA

Ontario

Wed 8/21

1 stop5h 26m

Seattle/Tacoma Intl

Wed 8/21

1 stop5h 00m

$246

Flights are sorted by cheapest first

Deals found on 5/23

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 May 22, 2024.
To ensure you get the cheapest price possible for a flight from Ontario to Seattle, you should look to book at least 80 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 May 19, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Ontario to Seattle flight should consider departing on Wednesday afternoons 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

Best time to book a flight from Ontario to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Ontario 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 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 May 24, 2024.
Read reviews from past customers who have flown Frontier, Alaska Airlines and United 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.
8.1
Very good
9,175 reviews

Crew

8.6

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Food

7.3

Reviews

1 / 10

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

8.1
Very good
9,175 reviews
8.1
Very good
9,175 reviews

Crew

8.6

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Food

7.3

Reviews

1 / 10

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

8.0
Very good
10,561 reviews
8.1
Very good
9,175 reviews

Crew

8.6

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Food

7.3

Reviews

1 / 10

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

7.4
Good
10,845 reviews
8.1
Very good
9,175 reviews

Crew

8.6

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Food

7.3

Reviews

1 / 10

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

6.3
Okay
4,039 reviews
8.1
Very good
9,175 reviews

Crew

8.6

Overall

8.1

Comfort

7.9

Boarding

8.2

Entertainment

7.3

Food

7.3

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 $98, but on average you can expect to pay $114.

  • 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 $108.

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

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

  • 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?

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

    On average 27 flights depart from Ontario to Seattle per day.
    Early Morning (Midnight to 6am) - 30% of flight departures
    Morning (6am - Noon) - 22% of flight departures
    Afternoon (Noon - 6pm) - 19% of flight departures
    Evening (6pm - Midnight) - 30% 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 $98. You may be able to fly from Ontario to Seattle for 52% less than the average price by searching for this airline.

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

    Consider Air France (100%), WestJet (99%) or Virgin Atlantic (96%) 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 $521, our data shows the cheapest flight currently is $39. When looking at the most popular route, (Ontario - Seattle/Tacoma Intl), you can expect to pay $98 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 5/23.

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

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

    Currently, January is the cheapest month in which you can book a flight from Ontario to Seattle (average of $247). Flying from Ontario to Seattle in July is currently the most expensive (average of $406). 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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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 May 24, 2024.

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 2,725,499 searches. Data last updated May 24, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$60Average$138FlexibilityNo cancel feeOn-time62%
Search Frontier flights
JetBlueCheapest$69Average$173FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
DeltaCheapest$79Average$218FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapest$90Average$223FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Spirit AirlinesCheapest$101Average$162FlexibilityNo 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

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.