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San Sebastian

$798+ 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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — EAS
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
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 September 16, 2025.

Round-trip from

$1,185
(Iberia)

One-way from

$798
(Iberia)

Popular in

November

Cheapest in

August

Average price

$910
From Ontario to San Sebastián
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One-way flight from Ontario to San Sebastián
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Highest demand for flights based on searches. 18% potential increase in price ($276 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($65 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 16, 2025.

This Iberia deal was found by Cheapflights users on 9/14. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2810:47 amONT - EAS
2 stops25h 03mIberia
Tue 12/29:30 pmEAS - ONT
2 stops33h 58mIberia
Deal found 9/14$1,185
This American Airlines deal was found by Cheapflights users on 9/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/286:10 amONT - EAS
2 stops29h 40mAmerican Airlines
Tue 12/21:40 pmEAS - ONT
2 stops41h 48mAmerican Airlines
Deal found 9/13$1,457
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/46:10 amONT - EAS
2 stops41h 30mMultiple Airlines
Wed 10/151:40 pmEAS - ONT
2 stops18h 02mMultiple Airlines
Deal found 9/15$1,556

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 September 16, 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

Fri 11/28

10:47 am-8:50 pm

2 stops25h 03m

San Sebastián

Tue 12/2

9:30 pm-10:28 pm

2 stops33h 58m

$1,185

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Fri 11/28

6:10 am-8:50 pm

2 stops29h 40m

San Sebastián

Tue 12/2

1:40 pm-10:28 pm

2 stops41h 48m

$1,457

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Sat 10/4

6:10 am-8:40 am

2 stops41h 30m

San Sebastián

Wed 10/15

1:40 pm-10:42 pm

2 stops18h 02m

$1,556

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Wed 10/15

10:57 am-8:50 pm

2 stops24h 53m

$798

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Mon 12/15

10:47 am-1:00 pm

2 stops41h 13m

$4,411

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

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.

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 25h 03m. Iberia provides one of the quickest options available for as low as $1,185. 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.

See more FAQs

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