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₹ 9,098+ Direct flights from Ontario

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 2/4. 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
10 Apr — 17 Apr1
1 adult
1 adult, Economy, 0 bags

Direct flights from Ontario

Enter your travel dates to find the best prices.

Cheapest flights from Ontario
Explore the most affordable flight options available from Ontario. Find the lowest fares based on data from user searches, with prices last updated on 11 March 2026.

Fri 24/419:59
ONT
-
SEA
Nonstop2h 51m
Alaska Airlines
Sun 26/407:05
SEA
-
ONT
Nonstop2h 40m
Alaska Airlines
Deal found 9/3₹ 12,590
Sun 5/406:00
ONT
-
SEA
Nonstop2h 55m
Delta
Tue 21/419:50
SEA
-
ONT
Nonstop2h 47m
Delta
Deal found 11/3₹ 12,682
Tue 21/407:00
ONT
-
SEA
Nonstop3h 07m
Delta
Tue 21/414:30
SEA
-
ONT
Nonstop2h 45m
Delta
Deal found 9/3₹ 12,774
Sat 25/410:39
ONT
-
SEA
Nonstop2h 51m
Alaska Airlines
Thu 30/421:17
SEA
-
ONT
Nonstop2h 42m
Alaska Airlines
Deal found 9/3₹ 13,509
Tue 5/507:00
ONT
-
SEA
Nonstop3h 07m
Delta
Sat 16/509:45
SEA
-
ONT
Nonstop2h 50m
Delta
Deal found 7/3₹ 13,601
Wed 15/406:00
ONT
-
SEA
Nonstop2h 54m
Hawaiian Airlines
Sun 19/407:00
SEA
-
ONT
Nonstop2h 39m
Hawaiian Airlines
Deal found 6/3₹ 13,693
Thu 30/419:59
ONT
-
SEA
Nonstop2h 51m
Alaska Airlines
Mon 4/521:17
SEA
-
ONT
Nonstop2h 42m
Alaska Airlines
Deal found 8/3₹ 14,428
Wed 6/514:20
ONT
-
SEA
Nonstop3h 04m
Delta
Fri 15/514:30
SEA
-
ONT
Nonstop2h 40m
Delta
Deal found 9/3₹ 14,520
Thu 30/407:00
ONT
-
SEA
Nonstop3h 07m
Delta
Sun 3/508:25
SEA
-
ONT
Nonstop2h 48m
Delta
Deal found 8/3₹ 14,612
Thu 30/419:59
ONT
-
SEA
Nonstop2h 51m
Alaska Airlines
Sat 9/507:05
SEA
-
ONT
Nonstop2h 40m
Alaska Airlines
Deal found 10/3₹ 15,347
Sat 4/406:00
ONT
-
SEA
Nonstop2h 55m
Delta
Sat 18/414:30
SEA
-
ONT
Nonstop2h 45m
Delta
Deal found 11/3₹ 15,439

Find direct flights from Ontario within your budget

 
Use the slider to find direct flights from Ontario within your budget. Price data is based on user searches made on Cheapflights. Over the past seven days, Cheapflights users made 454,620 searches. This data was last updated on 11 March 2026.

Fly to

Route

Depart

Return

Price

Cheapest return flight

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 8/4

06:00-08:54

Nonstop2h 54m

Seattle/Tacoma Intl

Wed 15/4

21:24-23:59

Nonstop2h 35m

₹ 14,428

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 20/5

19:41-22:30

Nonstop2h 49m

Seattle/Tacoma Intl

Sun 24/5

08:30-11:10

Nonstop2h 40m

₹ 19,943

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Fri 8/5

19:59-22:50

Nonstop2h 51m

Seattle/Tacoma Intl

Tue 9/6

16:10-18:47

Nonstop2h 37m

₹ 20,862

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 19/5

06:00-08:52

Nonstop2h 52m

Seattle/Tacoma Intl

Tue 9/6

21:22-23:58

Nonstop2h 36m

₹ 20,862
Fastest return journey

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Mon 6/4

19:08-21:57

Nonstop2h 49m

Seattle/Tacoma Intl

Sun 12/4

21:24-23:59

Nonstop2h 35m

₹ 22,240

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Fri 17/4

06:00-08:54

Nonstop2h 54m

Seattle/Tacoma Intl

Sun 19/4

07:00-09:39

Nonstop2h 39m

₹ 25,457

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Fri 12/6

14:00-17:00

Nonstop3h 00m

Seattle/Tacoma Intl

Sun 14/6

08:25-11:14

Nonstop2h 49m

₹ 27,295

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 2/7

17:38-20:20

Nonstop2h 42m

Seattle/Tacoma Intl

Sun 5/7

08:30-11:14

Nonstop2h 44m

₹ 27,295

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 24/3

10:33-13:23

Nonstop2h 50m

Seattle/Tacoma Intl

Sun 29/3

07:00-09:39

Nonstop2h 39m

₹ 28,214

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 25/3

10:33-13:23

Nonstop2h 50m

Seattle/Tacoma Intl

Sun 29/3

07:00-09:39

Nonstop2h 39m

₹ 28,214

Flights are sorted by cheapest return flights first.

Deals found on 10/3

Showing 1-10 of 23 resultsSorted by cheapest first
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Best time to book a flight from Ontario

Have a flexible travel schedule? Discover the best time to fly from Ontario with our price prediction graph.
Estimated return 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.

Related info for your journey

Access useful and relevant information related to your journey from Ontario. This can include details such as airport transportation, visa requirements, travel insurance, luggage regulations, and any other information that can ensure a smooth and hassle-free travel experience. Please note that the information is based on general guidance and may need to be verified with official sources. Data last updated 11 March 2026.

  • Where can you fly direct from Ontario?

    Currently, the most popular direct flight destination from Ontario is Denver.

  • What is the best time of year to fly direct from Ontario?

    If you're seeking the lowest price on a direct flight from Ontario, August is worth consideration as prices are at their lowest, on average. In terms of the number of daily non-stop flights, January offers travelers the most options.

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