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San Sebastian

$593+ Cheap flights from Ontario (ONT) to San Sebastian (EAS)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — EAS
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheap 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 December 12, 2025.

This oojo deal was found by Cheapflights users on 12/11. 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.
Thu 12/257:10 amONT - EAS
2 stops16h 30mIberia
Thu 1/19:20 amEAS - ONT
2 stops21h 54mIberia
Deal found 12/11$3,035
This KAYAK deal was found by Cheapflights users on 12/9. 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.
Mon 12/2210:50 amONT - EAS
2 stops17h 10mMultiple Airlines
Mon 12/299:30 pmEAS - ONT
2 stops21h 08mMultiple Airlines
Deal found 12/9$5,814
This KAYAK deal was found by Cheapflights users on 12/10. 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.
Thu 12/256:10 amONT - EAS
2 stops17h 30mIberia
Mon 1/59:30 pmEAS - ONT
2 stops21h 38mIberia
Deal found 12/10$5,913

Find 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 December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$593
(Iberia)

Popular in

February

Cheapest in

August

Average price

$1,640
Provider with most accurate pricing for Los Angeles-San Sebastián flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-San Sebastián flights.
Search Deals
From Ontario to San Sebastián
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($119 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($63 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 12, 2025.
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

Tue 1/20

6:00 am-1:00 pm

2 stops22h 00m

San Sebastián

Thu 1/29

9:30 pm-10:48 pm

2 stops34h 18m

$593

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Thu 1/22

7:16 am-8:40 am

2 stops16h 24m

San Sebastián

Sat 1/31

9:30 pm-10:08 am

2 stops21h 38m

$782

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Sat 1/17

7:16 am-8:40 am

2 stops16h 24m

San Sebastián

Sat 1/24

9:30 pm-10:08 am

2 stops21h 38m

$782

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Sat 1/17

7:16 am-8:40 am

2 stops16h 24m

San Sebastián

Tue 1/27

9:20 am-10:48 pm

2 stops22h 28m

$782

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Sat 1/24

7:16 am-8:40 am

2 stops16h 24m

San Sebastián

Sat 1/31

9:30 pm-10:08 am

2 stops21h 38m

$782

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Fri 1/16

11:59 pm-8:40 am

2 stops23h 41m

San Sebastián

Mon 1/26

9:30 pm-10:08 am

2 stops21h 38m

$782

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Fri 1/23

11:59 pm-8:40 am

2 stops23h 41m

San Sebastián

Mon 2/2

9:30 pm-10:08 am

2 stops21h 38m

$782

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Sat 1/17

7:16 am-8:40 am

2 stops16h 24m

San Sebastián

Mon 1/26

9:30 pm-10:08 am

2 stops21h 38m

$782

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Sat 1/24

7:16 am-8:40 am

2 stops16h 24m

San Sebastián

Mon 2/2

9:30 pm-10:08 am

2 stops21h 38m

$782

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Tue 1/20

7:16 am-8:40 am

2 stops16h 24m

San Sebastián

Fri 1/30

1:40 pm-10:08 am

2 stops29h 28m

$882

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

Showing 1-10 of 14 results
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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 $525). 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 16h 24m. Iberia provides one of the quickest options available for as low as $782. Airlines will cover a distance of 5729 mi. This flight may include one or multiple stops.

  • 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 $525). 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.

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