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₹ 8,965+ Cheap 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
17 Mar — 24 Mar1
1 adult
1 adult, Economy, 0 bags

What to know about flights from Ontario

Discover essential information about flights departing from Ontario, including flight schedules, destinations, airlines operating at the Ontario airport, and any specific guidelines or requirements for travellers. Please note that the information is based on the most recent updates available. Data last updated 15 February 2026.

Cheapest one-way flight

₹ 5,297

Cheapest round-trip flight

₹ 58,039

Cheapest airline

American Airlines

Most popular destination

San Francisco (SFO)

Good round-trip deal

₹ 9,541 or less
The cheapest one-way flight from Ontario is currently to San Francisco.
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The cheapest round-trip flight from Ontario is currently to London Heathrow.
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On average, American Airlines currently has the cheapest one-way flight from Ontario (avg. price of ₹ 8,926).
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San Francisco (SFO) is currently the most popular flight destination from Ontario (average return price of ₹ 7,733).
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Price to beat on a round-trip flight from Ontario.
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Find 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 15 February 2026.

Thu 12/313:20
ONT
-
SEA
1 stop5h 08m
Delta
Sun 15/308:30
SEA
-
ONT
Nonstop2h 48m
Delta
Deal found 12/2₹ 11,500
Thu 5/313:10
ONT
-
SEA
1 stop5h 19m
Delta
Sun 8/308:30
SEA
-
ONT
Nonstop2h 47m
Delta
Deal found 12/2₹ 11,591
Sat 7/316:02
ONT
-
SEA
Nonstop2h 50m
Hawaiian Airlines
Sun 8/308:30
SEA
-
ONT
Nonstop2h 38m
Hawaiian Airlines
Deal found 15/2₹ 11,682
Thu 5/313:10
ONT
-
SEA
1 stop5h 19m
Delta
Thu 12/305:30
SEA
-
ONT
1 stop6h 53m
Delta
Deal found 13/2₹ 12,406
Mon 23/311:00
ONT
-
SEA
1 stop6h 20m
Southwest
Fri 27/318:00
SEA
-
ONT
1 stop6h 10m
Southwest
Deal found 13/2₹ 13,674
Sat 14/316:02
ONT
-
SEA
Nonstop2h 50m
Alaska Airlines
Sat 14/320:56
SEA
-
ONT
Nonstop2h 36m
Alaska Airlines
Deal found 14/2₹ 13,764
Mon 9/306:00
ONT
-
SEA
1 stop7h 50m
Southwest
Wed 11/307:30
SEA
-
ONT
1 stop5h 55m
Southwest
Deal found 13/2₹ 14,127
Mon 9/306:00
ONT
-
SEA
Nonstop2h 54m
Delta
Tue 10/319:50
SEA
-
ONT
Nonstop2h 43m
Delta
Deal found 13/2₹ 14,217
Tue 10/306:14
ONT
-
SEA
Nonstop2h 55m
Hawaiian Airlines
Sun 15/308:30
SEA
-
ONT
Nonstop2h 38m
Hawaiian Airlines
Deal found 15/2₹ 14,579
Thu 12/312:02
ONT
-
SEA
Nonstop2h 50m
Alaska Airlines
Sun 15/308:30
SEA
-
ONT
Nonstop2h 38m
Alaska Airlines
Deal found 13/2₹ 15,123
Thu 19/311:59
ONT
-
SEA
Nonstop2h 56m
Delta
Mon 23/319:50
SEA
-
ONT
Nonstop2h 44m
Delta
Deal found 15/2₹ 15,213
Wed 6/515:24
ONT
-
SEA
Nonstop2h 51m
Alaska Airlines
Fri 15/521:29
SEA
-
ONT
1 stop20h 10m
Alaska Airlines
Deal found 13/2₹ 15,394

Find flights from Ontario within your budget

 
Find flights departing from Ontario that match your specified budget. Filter results by price range, allowing you to narrow down options and find flights that fit within your financial constraints. Please note that the search results are based on data from user searches, with fares last updated on 15 February 2026. In the last 7 days, Cheapflights users made a total of 454,620 searches

Fly to

Seattle

Route

Depart

Return

Price

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Fri 6/3

17:00-00:09

1 stop7h 09m

Seattle/Tacoma Intl

Sun 8/3

08:30-11:17

Nonstop2h 47m

₹ 11,500

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 11/3

13:20-18:28

1 stop5h 08m

Seattle/Tacoma Intl

Sun 15/3

08:30-11:18

Nonstop2h 48m

₹ 11,500

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 7/3

16:02-18:52

Nonstop2h 50m

Seattle/Tacoma Intl

Sun 8/3

08:30-11:08

Nonstop2h 38m

₹ 12,406

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 9/5

16:10-22:30

1 stop6h 20m

Seattle/Tacoma Intl

Mon 18/5

05:00-10:25

1 stop5h 25m

₹ 13,674

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 12/5

17:50-20:50

Nonstop3h 00m

Seattle/Tacoma Intl

Sat 16/5

10:00-12:53

Nonstop2h 53m

₹ 14,217

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 14/3

16:02-18:52

Nonstop2h 50m

Seattle/Tacoma Intl

Sun 15/3

08:30-11:08

Nonstop2h 38m

₹ 15,123

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 10/3

12:02-14:52

Nonstop2h 50m

Seattle/Tacoma Intl

Sun 15/3

08:30-11:08

Nonstop2h 38m

₹ 15,123

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 12/3

06:00-08:54

Nonstop2h 54m

Seattle/Tacoma Intl

Sun 15/3

08:30-11:18

Nonstop2h 48m

₹ 15,123

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 11/3

06:14-09:09

Nonstop2h 55m

Seattle/Tacoma Intl

Sun 15/3

08:30-11:08

Nonstop2h 38m

₹ 15,123

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Fri 13/3

17:53-20:50

Nonstop2h 57m

Seattle/Tacoma Intl

Sun 15/3

08:30-11:18

Nonstop2h 48m

₹ 15,123

Flights are sorted by cheapest return flights first.

Deals found on 14/2

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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.

Travel insights for flights from Ontario

Get recent, data-driven insights about flights from Ontario including ideal travel times, pricing trends, and more.

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

Use this chart to determine the optimal time to book a return flight from Ontario to Seattle. Price data was last updated on 13 February 2026.

Booking 55 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, March is the cheapest month in which you can book a flight from Ontario (average of ₹ 5,071). Flying from Ontario in July will prove the most costly (average of ₹ 12,134). There are multiple factors that influence the price of a flight so comparing airlines, departure airports and times can help keep costs down.

What are popular destinations to fly to from Ontario?

Ontario offers frequent flights to Dallas (103 flights per day), Seattle (88 flights per day) and Phoenix (76 flights per day).

Seattle/Tacoma Intl
Seattle/Tacoma Intl
From ₹ 128,691
Denver Intl
Denver Intl
From ₹ 9,541

What is the cheapest place to fly to from Ontario?

The cheapest city to fly to from Ontario is Denver Intl, with prices starting at ₹ 9,541. Explore other affordable destinations below.

Denver Intl
Denver Intl
From ₹ 9,541
Seattle/Tacoma Intl
Seattle/Tacoma Intl
From ₹ 128,691

Browse thousands of different options on Cheapflights for your next trip

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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 15 February 2026.

  • What are the most popular destinations to fly to from Ontario?

    For the current month, the most popular flights from Ontario are Dallas/Fort Worth Airport, Denver, Guadalajara. Dallas/Fort Worth Airport, Denver, Guadalajara are the most popular locations from Ontario year round.

  • What is the cheapest flight from Ontario to anywhere?

    Users have flown out of Ontario for as low as ₹ 9,541 to Denver (prices may vary depending on the airline and departure time). On average, users have booked flights for ₹ 69,342 to fly from Ontario.

  • What is the cheapest premium economy flight from Ontario?

    Options for some of the cheapest premium economy flights from Ontario we have found on Cheapflights are as follows:
    Fly from Ontario to Dallas/Fort Worth Airport starting at ₹ 187,135
    Fly from Ontario to Atlanta starting at ₹ 188,745

  • What is the cheapest month to fly from Ontario?

    March is currently the cheapest month to fly from Ontario. At this moment in time July is the most expensive month. These prices are determined by multiple factors and booking in advance can help keep costs down if your schedule is not as flexible.

  • Where are the cheapest places to fly to from Ontario?

    Here are some of the cheapest flight destinations from Ontario:
    Fly from Ontario to Seattle from ₹ 15,123 round trip
    Fly from Ontario to Orlando from ₹ 26,261 round trip
    Fly from Ontario to New Delhi from ₹ 74,708 round trip
    Fly from Ontario to Mumbai from ₹ 83,763 round trip
    Fly from Ontario to Hyderabad from ₹ 95,445 round trip

  • How does Cheapflights help users find flights from 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 from Ontario today with Cheapflights!

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

    Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Ontario for you. Better yet — we are completely free to use.

  • Can Cheapflights find flights from Ontario with no change fees?

    Yes, we can. To see specific flights from Ontario with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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

    Of course! You can now track prices for flights from Ontario and get an alert from Cheapflights when they change. Click the bell icon next to the flight deals above and provide your email address to set up price alerts.

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Fly with Cheapflights

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

How does Cheapflights help users find flights from 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 from Ontario today with Cheapflights!

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Ontario for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Ontario with no change fees?

Yes, we can. To see specific flights from Ontario with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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

Of course! You can now track prices for flights from Ontario and get an alert from Cheapflights when they change. Click the bell icon next to the flight deals above and provide your email address to set up price alerts.

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