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$406+ 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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BCN
Aug 22 — Aug 291
Sat 8/22
Sat 8/29
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 July 23, 2026.

This United Airlines deal was found by Cheapflights users on 7/22. 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 8/21:50 pm
ONT
-
BCN
1 stop15h 30m
United Airlines
Fri 9/253:15 pm
BCN
-
ONT
1 stop16h 34m
United Airlines
Deal found 7/22$711
This United Airlines deal was found by Cheapflights users on 7/22. 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.
Wed 11/46:46 am
ONT
-
BCN
1 stop21h 29m
United Airlines
Fri 11/209:55 am
BCN
-
ONT
2 stops19h 11m
United Airlines
Deal found 7/22$714
This United Airlines deal was found by Cheapflights users on 7/21. 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 10/2011:10 am
ONT
-
BCN
1 stop18h 10m
United Airlines
Thu 10/2910:30 am
BCN
-
ONT
2 stops18h 26m
United Airlines
Deal found 7/21$715
This United Airlines deal was found by Cheapflights users on 7/21. 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 9/121:56 pm
ONT
-
BCN
2 stops33h 04m
United Airlines
Fri 9/2512:15 pm
BCN
-
ONT
2 stops43h 34m
United Airlines
Deal found 7/21$724
This United Airlines deal was found by Cheapflights users on 7/22. 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.
Mon 8/31:49 pm
ONT
-
BCN
1 stop15h 31m
United Airlines
Wed 8/263:15 pm
BCN
-
ONT
1 stop16h 20m
United Airlines
Deal found 7/22$741
This United Airlines deal was found by Cheapflights users on 7/21. 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 10/1011:10 am
ONT
-
BCN
1 stop18h 10m
United Airlines
Tue 10/206:40 am
BCN
-
ONT
2 stops20h 01m
United Airlines
Deal found 7/21$764
This United Airlines deal was found by Cheapflights users on 7/21. 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.
Thu 11/195:00 am
ONT
-
BCN
2 stops19h 35m
United Airlines
Thu 12/31:50 pm
BCN
-
ONT
2 stops18h 16m
United Airlines
Deal found 7/21$767
This Kissandfly.com deal was found by Cheapflights users on 7/22. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/81:50 pm
ONT
-
BCN
1 stop15h 30m
Lufthansa
Fri 8/214:10 pm
BCN
-
ONT
1 stop15h 49m
Lufthansa
Deal found 7/22$779
This United Airlines deal was found by Cheapflights users on 7/22. 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 8/81:50 pm
ONT
-
BCN
1 stop15h 30m
United Airlines
Fri 8/213:15 pm
BCN
-
ONT
1 stop16h 20m
United Airlines
Deal found 7/22$791
This United Airlines deal was found by Cheapflights users on 7/22. 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 8/238:50 am
ONT
-
BCN
1 stop20h 30m
United Airlines
Sun 9/66:40 am
BCN
-
ONT
2 stops22h 21m
United Airlines
Deal found 7/22$794
This United Airlines deal was found by Cheapflights users on 7/22. 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.
Fri 8/217:00 am
ONT
-
BCN
1 stop21h 15m
United Airlines
Fri 8/2812:15 pm
BCN
-
ONT
2 stops40h 46m
United Airlines
Deal found 7/22$801
This United Airlines deal was found by Cheapflights users on 7/22. 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.
Wed 7/291:50 pm
ONT
-
BCN
1 stop15h 30m
United Airlines
Tue 8/113:15 pm
BCN
-
ONT
1 stop16h 20m
United Airlines
Deal found 7/22$806

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 July 23, 2026.

Round-trip from

$711
(United Airlines)

One-way from

$406
(Iberia)

Popular in

December

Cheapest in

September

Average price

$1,373
From Ontario to Barcelona
Search Deals
One-way flight from Ontario to Barcelona
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($37 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($37 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
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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 23, 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

Cheapest round-trip

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 8/12

9:01 am-2:20 pm

1 stop20h 19m

Barcelona-El Prat

Mon 8/17

3:15 pm-10:35 pm

1 stop16h 20m

$856

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Sat 12/12

5:00 am-8:20 am

2 stops18h 20m

Barcelona-El Prat

Tue 12/22

9:55 am-10:48 pm

2 stops21h 53m

$931

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Mon 9/14

9:10 pm-11:15 pm

2 stops41h 05m

Barcelona-El Prat

Thu 10/8

7:40 am-11:42 pm

2 stops25h 02m

$1,036

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Thu 9/10

6:20 am-11:10 am

1 stop19h 50m

Barcelona-El Prat

Thu 9/17

11:00 am-10:24 pm

1 stop20h 24m

$1,049

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Tue 9/22

10:25 am-10:10 am

1 stop14h 45m

Barcelona-El Prat

Mon 10/5

10:45 am-6:44 pm

1 stop16h 59m

$1,060

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Tue 11/3

6:00 am-8:20 am

2 stops17h 20m

Barcelona-El Prat

Thu 11/12

10:30 am-8:56 pm

2 stops19h 26m

$1,102

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Fri 9/11

9:10 pm-5:40 pm

2 stops35h 30m

Barcelona-El Prat

Fri 9/25

7:40 am-8:13 pm

2 stops45h 33m

$1,116

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Tue 9/8

11:50 pm-5:40 pm

2 stops32h 50m

Barcelona-El Prat

Wed 9/16

7:05 pm-8:13 pm

2 stops34h 08m

$1,156

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 10/14

10:25 am-10:10 am

1 stop14h 45m

Barcelona-El Prat

Mon 11/2

10:40 am-6:47 pm

1 stop17h 07m

$1,220

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Sat 9/5

11:13 pm-10:45 am

2 stops26h 32m

Barcelona-El Prat

Wed 9/16

7:05 pm-8:13 pm

2 stops34h 08m

$1,226

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/18

Showing 1-10 of 24 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

No data available for this route at this time. Please check back soon.

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 23, 2026.
Peruse reviews from past customers who have flown with United Airlines and Iberia 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
10,024 reviews

Food

6.6

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
United Airlines
7.4
Good
10,024 reviews
United Airlines
7.4
Good
10,024 reviews

Food

6.6

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
Iberia
7.0
Good
3,257 reviews
United Airlines
7.4
Good
10,024 reviews

Food

6.6

Overall

7.4

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.

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

  • How long is the flight from Ontario to Barcelona?

    Airlines like United Airlines, Delta, and British Airways fly from Ontario to Barcelona in about 14h 45m. The time it takes to get you to your destination can typically vary by up to 5h 34m. 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. Check Cheapflights for deals on United Airlines for as low as $714. Iberia is currently priced 45% 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Ontario to Barcelona

Discover the top 2 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 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$605Average$737FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$714Average$1,111FlexibilityNo cancel feeOn-time69%

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