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$248+ 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 4/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BCN
Mar 30 — Apr 61
Mon 3/30
Mon 4/6
1 adult, Economy
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Cheap 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 February 28, 2026.

This Expedia deal was found by Cheapflights users on 2/25. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/157:30 am
ONT
-
BCN
1 stop15h 05m
British Airways
Wed 4/2210:45 am
BCN
-
ONT
1 stop16h 52m
British Airways
Deal found 2/25$835
This American Airlines deal was found by Cheapflights users on 2/24. 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.
Mon 4/136:00 am
ONT
-
BCN
1 stop16h 35m
American Airlines
Wed 4/2910:45 am
BCN
-
ONT
1 stop16h 52m
American Airlines
Deal found 2/24$839
This oojo deal was found by Cheapflights users on 2/25. 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.
Tue 4/146:00 am
ONT
-
BCN
1 stop16h 35m
British Airways
Thu 4/2310:45 am
BCN
-
ONT
1 stop20h 51m
British Airways
Deal found 2/25$841
This United Airlines deal was found by Cheapflights users on 2/25. 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.
Tue 4/145:10 am
ONT
-
BCN
2 stops32h 15m
United Airlines
Thu 4/2312:15 pm
BCN
-
ONT
2 stops43h 11m
United Airlines
Deal found 2/25$844
This United Airlines deal was found by Cheapflights users on 2/27. 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.
Sun 4/127:00 am
ONT
-
BCN
1 stop21h 15m
United Airlines
Tue 4/2112:15 pm
BCN
-
ONT
2 stops43h 16m
United Airlines
Deal found 2/27$846
This British Airways deal was found by Cheapflights users on 2/24. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/137:30 am
ONT
-
BCN
1 stop15h 05m
British Airways
Wed 4/2910:45 am
BCN
-
ONT
1 stop16h 52m
British Airways
Deal found 2/24$848
This oojo deal was found by Cheapflights users on 2/25. 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 9/2811:59 pm
ONT
-
BCN
1 stop25h 11m
British Airways
Thu 10/81:30 pm
BCN
-
ONT
1 stop19h 45m
British Airways
Deal found 2/25$849
This oojo deal was found by Cheapflights users on 2/27. 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.
Sun 4/127:30 am
ONT
-
BCN
1 stop15h 05m
British Airways
Tue 4/2110:45 am
BCN
-
ONT
1 stop19h 09m
British Airways
Deal found 2/27$861
This oojo deal was found by Cheapflights users on 2/25. 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.
Wed 4/87:30 am
ONT
-
BCN
1 stop15h 05m
British Airways
Wed 4/1510:45 am
BCN
-
ONT
1 stop16h 52m
British Airways
Deal found 2/25$864
This United Airlines deal was found by Cheapflights users on 2/27. 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.
Tue 4/147:00 am
ONT
-
BCN
1 stop21h 15m
United Airlines
Tue 4/213:15 pm
BCN
-
ONT
1 stop16h 16m
United Airlines
Deal found 2/27$866

Find 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 February 28, 2026.

Round-trip from

$835
(Expedia)

One-way from

$248
(Kiwi.com)

Popular in

June

Cheapest in

August

Average price

$874
From Ontario to Barcelona
Search Deals
One-way flight from Ontario to Barcelona
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($231 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($40 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

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 February 28, 2026.
Use the filters below to find and compare flights from Ontario to Barcelona that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Sun 4/12

7:00 am-1:15 pm

1 stop21h 15m

Barcelona-El Prat

Tue 4/21

12:15 pm-10:31 pm

2 stops43h 16m

$846

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Mon 4/13

7:30 am-7:35 am

1 stop15h 05m

Barcelona-El Prat

Wed 4/29

10:45 am-6:37 pm

1 stop16h 52m

$848

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Tue 4/14

7:00 am-1:15 pm

1 stop21h 15m

Barcelona-El Prat

Tue 4/21

3:15 pm-10:31 pm

1 stop16h 16m

$866

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Mon 5/25

1:50 pm-2:20 pm

1 stop15h 30m

Barcelona-El Prat

Thu 6/4

4:10 pm-10:37 pm

1 stop15h 27m

$1,044

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Fri 4/10

7:00 am-9:20 am

2 stops17h 20m

Barcelona-El Prat

Fri 4/17

3:15 pm-10:26 pm

1 stop16h 11m

$1,047

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 5/27

1:50 pm-2:20 pm

1 stop15h 30m

Barcelona-El Prat

Wed 6/3

11:15 am-10:46 pm

2 stops20h 31m

$1,048

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Sun 4/12

7:30 am-7:35 am

1 stop15h 05m

Barcelona-El Prat

Sun 4/19

10:45 am-6:37 pm

1 stop16h 52m

$1,060

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Mon 7/20

7:00 am-12:50 pm

1 stop20h 50m

Barcelona-El Prat

Thu 7/30

11:00 am-6:15 pm

1 stop16h 15m

$1,064

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Mon 4/6

7:00 am-8:20 am

2 stops16h 20m

Barcelona-El Prat

Sun 4/12

7:55 am-9:50 pm

2 stops22h 55m

$1,086

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Sat 8/1

6:39 pm-2:20 pm

1 stop34h 41m

Barcelona-El Prat

Sat 8/15

12:15 pm-12:33 pm

2 stops33h 18m

$1,124

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/27

Showing 1-10 of 22 resultsSorted by cheapest first
1
2
3

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, October is the cheapest month in which you can book a flight from Ontario to Barcelona (average of $367). Flying from Ontario to Barcelona in June is currently the most expensive (average of $613). 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.

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 February 28, 2026.
Peruse reviews from past customers who have flown with United Airlines, Iberia, and British Airways 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.
United Airlines
7.4
Good
9,360 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
9,360 reviews
United Airlines
7.4
Good
9,360 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Iberia
7.0
Good
3,127 reviews
United Airlines
7.4
Good
9,360 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
British Airways
6.7
Okay
7,772 reviews
United Airlines
7.4
Good
9,360 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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. 3 airlines have flights to Barcelona from Ontario on a regular basis.

  • How long is the flight from Ontario to Barcelona?

    Airlines like British Airways, American Airlines, and United Airlines fly from Ontario to Barcelona in about 15h 05m. The time it takes to get you to your destination can typically vary by up to 17h 10m. Ontario and Barcelona are separated by a distance of 5971 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Currently priced at $605, 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 British Airways and United Airlines - these airlines can fly you to your destination from $645 and $682, respectively. Iberia is currently priced 39% below the average price you’ll pay for this route.

  • 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, October is the cheapest month in which you can book a flight from Ontario to Barcelona (average of $367). Flying from Ontario to Barcelona in June is currently the most expensive (average of $613). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 3 airlines flying from Ontario to Barcelona

Discover the top 3 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 February 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$605Average$818FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$645Average$961FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$682Average$941FlexibilityNo cancel feeOn-time69%

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