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$645+ Cheap flights from Ontario (ONT) to San Sebastian (EAS)

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 2/21. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — EAS
Feb 14 — Feb 211
Sat 2/14
Sat 2/21
1 adult, Economy
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Cheap flight deals from Ontario to San Sebastian

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to San Sebastian (EAS). 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 January 15, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$922
(Iberia)

One-way from

$645
(Cheapflightsfares)

Popular in

February

Cheapest in

January

Average price

$567
Provider with most accurate pricing for Los Angeles-San Sebastián flight deals.
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Provider most trusted by Cheapflights users for Los Angeles-San Sebastián flights.
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From Ontario to San Sebastián
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One-way flight from Ontario to San Sebastián
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High demand for flights, 3% potential price rise
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Cheapest flight prices on average. 5% potential price decrease ($63 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find flight deals from Ontario to San Sebastian

Cheapest flights from Ontario to San Sebastian
Explore the most affordable flight options available from Ontario to San Sebastian. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 15, 2026.

This KAYAK deal was found by Cheapflights users on 1/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/272:56 pm
ONT
-
EAS
2 stops20h 54m
Iberia
Sun 10/49:20 am
EAS
-
ONT
2 stops23h 57m
Iberia
Deal found 1/15$817
This Iberia deal was found by Cheapflights users on 1/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/257:00 am
ONT
-
EAS
2 stops28h 50m
Iberia
Sun 3/11:40 pm
EAS
-
ONT
2 stops42h 09m
Iberia
Deal found 1/13$960
This oojo deal was found by Cheapflights users on 1/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3010:57 am
ONT
-
EAS
2 stops18h 03m
Iberia
Sat 11/79:30 pm
EAS
-
ONT
2 stops23h 23m
Iberia
Deal found 1/15$988
This Priceline deal was found by Cheapflights users on 1/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/282:56 pm
ONT
-
EAS
2 stops20h 54m
Iberia
Wed 9/309:20 am
EAS
-
ONT
2 stops21h 30m
Iberia
Deal found 1/14$1,113
This KAYAK deal was found by Cheapflights users on 1/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/187:16 am
ONT
-
EAS
2 stops16h 24m
Iberia
Tue 1/201:40 pm
EAS
-
ONT
3 stops31h 23m
Iberia
Deal found 1/14$1,358
This KAYAK deal was found by Cheapflights users on 1/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/142:22 pm
ONT
-
EAS
2 stops37h 38m
Iberia
Wed 6/249:30 pm
EAS
-
ONT
2 stops35h 29m
Iberia
Deal found 1/14$1,816
This Priceline deal was found by Cheapflights users on 1/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/302:22 pm
ONT
-
EAS
2 stops21h 28m
Iberia
Thu 7/99:30 pm
EAS
-
ONT
2 stops35h 29m
Iberia
Deal found 1/15$2,067
This oojo deal was found by Cheapflights users on 1/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/62:39 pm
ONT
-
EAS
2 stops37h 21m
Iberia
Fri 4/109:20 am
EAS
-
ONT
2 stops22h 15m
Iberia
Deal found 1/15$8,271

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to San Sebastian 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 2,558,603 searches. Data last updated January 15, 2026.
Use the filters below to find and compare flights from Ontario to San Sebastian that are best for you.

Fly from

Ontario

Fly to

San Sebastian

Route

Depart

Return

Price

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Wed 2/25

7:00 am-8:50 pm

2 stops28h 50m

San Sebastián

Sun 3/1

1:40 pm-10:49 pm

2 stops42h 09m

$960

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Sun 6/14

2:22 pm-1:00 pm

2 stops37h 38m

San Sebastián

Wed 6/24

9:30 pm-11:59 pm

2 stops35h 29m

$1,816

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Tue 6/30

2:22 pm-8:50 pm

2 stops21h 28m

San Sebastián

Thu 7/9

9:30 pm-11:59 pm

2 stops35h 29m

$2,067

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Mon 4/6

2:39 pm-1:00 pm

2 stops37h 21m

San Sebastián

Fri 4/10

9:20 am-10:35 pm

2 stops22h 15m

$8,271

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Sat 2/21

7:00 am-8:40 am

2 stops16h 40m

$645

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Sat 5/9

10:59 am-4:10 pm

2 stops20h 11m

$1,269

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Sun 2/1

10:58 am-8:50 pm

2 stops24h 52m

$7,902

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/14

Best time to book a flight from Ontario to San Sebastian

Have a flexible travel schedule? Discover the best time to fly to San Sebastian 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.

Cheapflights Insights

Everything you need to know about your flight from Ontario to San Sebastian

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

Currently, January is the cheapest month in which you can book a flight from Ontario to San Sebastian (average of $505). Flying from Ontario to San Sebastian in June is currently the most expensive (average of $1,005). 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.

Related info for your journey

Find useful and relevant information for your journey from Ontario to San Sebastian. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Ontario to San Sebastian?

    A quick flight from Ontario to San Sebastian can take about 28h 50m. Iberia provides one of the quickest options available for as low as $960. Airlines will cover a distance of 5729 mi.

  • Can I find deals for flights from Ontario to San Sebastian that include hotel bookings?

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

  • How can I find direct flights from Ontario to San Sebastian?

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

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

    Yes. Cheapflights offers flight deals from Ontario to San Sebastian by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, January is the cheapest month in which you can book a flight from Ontario to San Sebastian (average of $505). Flying from Ontario to San Sebastian in June is currently the most expensive (average of $1,005). 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.

See more FAQs

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