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San Sebastian

$648+ 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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — EAS
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
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 July 29, 2025.

Round-trip from

$824
(Iberia)

One-way from

$648
(Iberia)

Popular in

November

Cheapest in

August

Average price

$1,255
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. 14% potential increase in price ($203 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($67 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 29, 2025.

This Iberia deal was found by Cheapflights users on 7/26. 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 11/288:46 amONT - EAS
2 stops27h 04mIberia
Tue 12/29:30 pmEAS - ONT
2 stops47h 00mIberia
Deal found 7/26$824
This American Airlines deal was found by Cheapflights users on 7/28. 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.
Sun 10/58:15 amONT - EAS
2 stops27h 35mMultiple Airlines
Sun 10/121:40 pmEAS - ONT
2 stops19h 19mMultiple Airlines
Deal found 7/28$1,206
This KAYAK deal was found by Cheapflights users on 7/29. 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 12/2811:00 amONT - EAS
2 stops24h 50mBritish Airways
Mon 1/51:40 pmEAS - ONT
2 stops33h 08mBritish Airways
Deal found 7/29$4,516

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 July 29, 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

8:46 am-8:50 pm

2 stops27h 04m

San Sebastián

Tue 12/2

9:30 pm-11:30 am

2 stops47h 00m

$824

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Sun 10/5

8:15 am-8:50 pm

2 stops27h 35m

San Sebastián

Sun 10/12

1:40 pm-11:59 pm

2 stops19h 19m

$1,206

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Sun 12/28

11:00 am-8:50 pm

2 stops24h 50m

San Sebastián

Mon 1/5

1:40 pm-1:48 pm

2 stops33h 08m

$4,516

OntarioSan Sebastian

ONT - EAS

ONTEAS

Ontario

Fri 10/3

2:54 pm-8:50 pm

2 stops20h 56m

$648

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

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.

Reviews of airlines servicing San Sebastian

Get insights into the airlines that provide service to San Sebastian. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Sebastian. Reviews last updated July 29, 2025.
See what other customers who have flown with Iberia and British Airways from Ontario to San Sebastian have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Iberia
7.0
Good
2,858 reviews

Food

6.3

Crew

7.6

Boarding

7.1

Overall

7.0

Entertainment

6.6

Comfort

6.7

Reviews

1 / 20
6.0
Good

David,May 2025

JFK - MAD

Unfortunately carry on bag over head was full. I was seated 27J and had to place my carry on by seat 8 .. other then that it was a good flight
Iberia
7.0
Good
2,858 reviews
Iberia
7.0
Good
2,858 reviews

Food

6.3

Crew

7.6

Boarding

7.1

Overall

7.0

Entertainment

6.6

Comfort

6.7

Reviews

1 / 20
6.0
Good

David,May 2025

JFK - MAD

Unfortunately carry on bag over head was full. I was seated 27J and had to place my carry on by seat 8 .. other then that it was a good flight
British Airways
6.6
Okay
7,208 reviews
Iberia
7.0
Good
2,858 reviews

Food

6.3

Crew

7.6

Boarding

7.1

Overall

7.0

Entertainment

6.6

Comfort

6.7

Reviews

1 / 20
6.0
Good

David,May 2025

JFK - MAD

Unfortunately carry on bag over head was full. I was seated 27J and had to place my carry on by seat 8 .. other then that it was a good flight

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.

  • 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.

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