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$381+ Cheap flights from Ontario (ONT) to Barcelona

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 9/17. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BCN
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheap flight deals from Ontario to Barcelona

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Barcelona (S37). 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

$647
(Iberia)

One-way from

$381
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$1,165
From Ontario to Barcelona
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One-way flight from Ontario to Barcelona
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Highest demand for flights based on searches. 28% potential increase in price ($354 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($47 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 Barcelona

Cheapest flights from Ontario to Barcelona
Explore the most affordable flight options available from Ontario to Barcelona. 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 7/29. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2010:50 amONT - BCN
1 stop14h 20mIberia
Wed 9/247:00 amBCN - ONT
2 stops20h 54mIberia
Deal found 7/29$647
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/206:50 pmONT - BCN
1 stop34h 10mUnited Airlines
Wed 10/112:10 pmBCN - ONT
2 stops43h 20mUnited Airlines
Deal found 7/28$666
This Booking.com 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/55:05 amONT - BCN
2 stops19h 30mAir Canada
Tue 12/21:35 pmBCN - ONT
2 stops40h 07mAir Canada
Deal found 7/29$674
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/810:53 amONT - BCN
1 stop14h 17mBritish Airways
Tue 9/1612:20 pmBCN - ONT
1 stop15h 34mBritish Airways
Deal found 7/29$712
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2110:50 amONT - BCN
1 stop14h 20mAmerican Airlines
Fri 9/512:20 pmBCN - ONT
1 stop15h 34mAmerican Airlines
Deal found 7/29$719

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Barcelona 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 Barcelona that are best for you.

Fly from

Ontario

Fly to

Barcelona

Route

Depart

Return

Price

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 8/20

10:50 am-10:10 am

1 stop14h 20m

Barcelona-El Prat

Wed 9/24

7:00 am-6:54 pm

2 stops20h 54m

$647

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Sat 9/20

6:50 pm-2:00 pm

1 stop34h 10m

Barcelona-El Prat

Wed 10/1

12:10 pm-10:30 pm

2 stops43h 20m

$666

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 11/5

5:05 am-9:35 am

2 stops19h 30m

Barcelona-El Prat

Tue 12/2

1:35 pm-8:42 pm

2 stops40h 07m

$674

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Mon 9/8

10:53 am-10:10 am

1 stop14h 17m

Barcelona-El Prat

Tue 9/16

12:20 pm-6:54 pm

1 stop15h 34m

$712

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Thu 8/21

10:50 am-10:10 am

1 stop14h 20m

Barcelona-El Prat

Fri 9/5

12:20 pm-6:54 pm

1 stop15h 34m

$719

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 9/17

8:00 am-8:55 pm

3 stops51h 55m

$381

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Tue 9/30

8:15 am-10:10 am

1 stop16h 55m

$516

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Tue 8/19

7:00 am-9:00 am

2 stops17h 00m

$518

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Tue 9/30

4:15 pm-7:50 am

3 stops30h 35m

$525

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 9/17

11:55 am-3:40 pm

2 stops18h 45m

$537

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 14 results
1
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Best time to book a flight from Ontario to Barcelona

Have a flexible travel schedule? Discover the best time to fly to Barcelona 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 Barcelona

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

Currently, January is the cheapest month in which you can book a flight from Ontario to Barcelona (average of $523). Flying from Ontario to Barcelona in June is currently the most expensive (average of $1,056). 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.

What is the cheapest time of day to fly from ONT to BCN?

Find hourly flight availability from Ontario to Barcelona. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2025.

It’s typically best to fly out from Ontario to Barcelona in the afternoon. Doing so could potentially save you 18% on the flight price compared to flying in the evening, which is usually more expensive.

Reviews of airlines servicing Barcelona

Get insights into the airlines that provide service to Barcelona. 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 Barcelona. Reviews last updated July 29, 2025.
Peruse reviews from past customers who have flown with Delta, KLM, and Air France from Ontario to Barcelona to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,979 reviews

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,979 reviews
Delta
8.0
Very good
7,979 reviews

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,979 reviews

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air France
7.5
Good
1,465 reviews
Delta
8.0
Very good
7,979 reviews

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,896 reviews
Delta
8.0
Very good
7,979 reviews

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,979 reviews

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

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

  • What airport do you fly from for flights from Ontario to Barcelona?

    For a flight from Ontario to Barcelona, you will be flying from Ontario. Ontario (ONT) is just 3.1 mi from the center of the city. Ontario is the only Ontario airport and it handles 0 outbound flights to Barcelona per day. 5 airlines have flights to Barcelona from Ontario on a regular basis.

  • What are the cheapest airlines flying from Ontario to Barcelona round-trip?

    Currently priced at $647, Iberia will fly you from Ontario to Barcelona and back. In addition to Iberia, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from United Airlines and Air Canada - these airlines can fly you to your destination from $666 and $674, respectively. Iberia is currently priced 28% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Ontario to Barcelona one-way?

    One-way options have recently been found by users for as low as $516 on British Airways. Other airlines that offer cheap prices include United Airlines from $518 and Air Canada from $525 one-way.

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

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

  • How can I find direct flights from Ontario to Barcelona?

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

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

    Yes. Cheapflights offers flight deals from Ontario to Barcelona 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 Barcelona?

    Currently, January is the cheapest month in which you can book a flight from Ontario to Barcelona (average of $523). Flying from Ontario to Barcelona in June is currently the most expensive (average of $1,056). 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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Alternative routes for Ontario to Barcelona

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Top 5 airlines flying from Ontario to Barcelona

Discover the top 5 airlines that operate flights from Ontario to Barcelona. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$544Average$882FlexibilityNo cancel feeOn-time70%
DeltaCheapest$566Average$729FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$588Average$1,035FlexibilityNo cancel feeOn-time69%
IberiaCheapest$605Average$1,084FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$687Average$1,164FlexibilityNo cancel feeOn-time71%

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