Cheap flights from Ontario (ONT) to Worldwide

Good to Know: Cheapest and Fastest Flights from ONT

Useful information for finding cheap flights from Ontario International and booking your next trip

Cheapest Round Trip Flight

$342

Southwest Airlines • 1 stop • 10h 10m

Jul 31 – Aug 08

The cheapest round trip flight from Ontario to Seattle (ONT-SEA-ONT) is currently $342

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Cheapest One way Flight

$208

Delta Airlines • 1 stop • 15h 37m

Jun 30

The cheapest one way flight from Ontario to Cincinnati (ONT-CVG) is currently $208

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Cheapest Direct Flight

$291

Alaska Airlines • nonstop • 4h 2m

Jul 31

The cheapest nonstop flight from Ontario to Seattle (ONT-SEA) is currently $291

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Fastest Flight

1h 55m

The fastest nonstop flight from Ontario to Seattle (ONT-SEA) takes 1h 55m

Top Airlines Flying from Ontario International (ONT)

Southwest Airlines

Delta Airlines

United Airlines

American Airlines

Alaska Airlines

Avianca

Aeromexico

Philippine Airlines

Qatar Airways

Japan Airlines

Most Recent Flight Deals from Ontario Now!

Compare and book low fare round-trip air tickets from Ontario. Ideal for travelers with confirmed return itineraries.

Jul 31 - Aug 08, Economy

Ontario → Seattle

10h 10m

5:45 PM - 11:55 PM • 1 stop

Ontario → Seattle

10:34 AM - 1:34 PM • nonstop

$342

Southwest Airlines

Jul 30 - Aug 07, Economy

Ontario → Seattle

1h 55m

8:00 AM - 1:50 PM • 1 stop

Ontario → Seattle

6h 40m

6:10 PM - 10:10 PM • nonstop

$342

Southwest Airlines

Jul 31 - Aug 08, Economy

Ontario → Seattle

12h 15m

4:00 PM - 11:35 PM • 1 stop

Ontario → Seattle

6h 50m

3:35 PM - 7:45 PM • 1 stop

$342

Southwest Airlines

Jul 31 - Aug 08, Economy

Ontario → Seattle

7h 30m

5:10 PM - 10:00 PM • 1 stop

Ontario → Seattle

10h 46m

5:30 AM - 12:16 PM • 1 stop

$372

Delta Airlines

Jul 23 - Jul 26, Economy

Ontario → Texas

4h 15m

6:35 AM - 1:45 PM • 1 stop

Ontario → Texas

5h 28m

4:02 PM - 5:30 PM • nonstop

$419

Southwest Airlines

Jul 07 - Jul 30, Economy

Ontario → Everett

7h 33m

7:00 AM - 11:53 AM • 1 stop

Ontario → Everett

4h 1m

8:33 AM - 11:14 AM • nonstop

$443

Alaska Airlines

Explore competitive one-way airfare options from Ontario. Best suited for flexible or open-ended travel plans.

Jun 30, Economy

Ontario → Cincinnati

15h 37m

11:50 AM - 12:27 AM • 1 stop

$208

Delta Airlines

Jun 28, Economy

Ontario → Oklahoma City

10h 1m

5:00 AM - 1:01 PM • 1 stop

$366

United Airlines

Jun 28, Economy

Ontario → Oklahoma City

12h 30m

11:55 AM - 9:45 PM • 1 stop

$449

Southwest Airlines

Jun 28, Economy

Ontario → Oklahoma City

7h 33m

1:18 PM - 8:11 PM • 1 stop

$662

United Airlines

Jun 30, Economy

Ontario → Cincinnati

10h 27m

5:00 AM - 2:27 PM • 1 stop

$681

United Airlines

Jun 28, Economy

Ontario → Oklahoma City

36h 45m

9:45 AM - 9:50 AM • 3 stops

$1093

Southwest Airlines

Access real-time availability on last-minute departures from Ontario. Tailored for urgent or short-notice travel requirements.

Jun 25 - Jun 26, Economy

Ontario → Dallas

5h 14m

6:30 AM - 11:44 AM • nonstop

Ontario → Dallas

10h 47m

5:18 AM - 10:05 AM • 1 stop

$486

Frontier Airlines

Jun 25 - Jun 26, Economy

Ontario → Dallas

8h 36m

12:14 PM - 7:30 PM • 1 stop

Ontario → Dallas

10h 47m

5:18 AM - 10:05 AM • 1 stop

$498

Frontier Airlines

Jun 24 - Jun 28, Economy

Ontario → Miami

11h 40m

11:59 PM - 9:59 AM • 1 stop

Ontario → Miami

8h 51m

7:02 AM - 9:33 AM • nonstop

$671

American Airlines

Jun 25 - Jun 26, Economy

Ontario → Dallas

5h 15m

6:00 AM - 11:15 AM • nonstop

Ontario → Dallas

5h 16m

3:29 PM - 4:45 PM • nonstop

$753

American Airlines

Jun 25 - Jun 26, Economy

Ontario → Dallas

12h 31m

7:00 AM - 4:51 PM • 1 stop

Ontario → Dallas

10h 31m

5:24 PM - 9:55 PM • 1 stop

$754

United Airlines

Jun 24 - Jun 24, Economy

Ontario → Miami

15h 35m

7:00 AM - 7:35 PM • 1 stop

Ontario → Miami

10:05 PM - 12:45 AM • nonstop

$798

American Airlines

Discover direct flight options from Ontario (ONT). Save time by avoiding layovers and reaching your destination directly.

Jul 31 - Aug 08, Economy

Ontario → Seattle

4h 2m

6:02 AM - 8:44 AM • nonstop

Ontario → Seattle

4h 4m

10:25 AM - 1:09 PM • nonstop

$291

Alaska Airlines

Jul 23 - Jul 26, Economy

Ontario → Texas

5h 31m

6:25 PM - 11:56 PM • nonstop

Ontario → Texas

5h 28m

4:02 PM - 5:30 PM • nonstop

$334

Frontier Airlines

Jul 07 - Jul 30, Economy

Ontario → Seattle

2:00 PM - 4:40 PM • nonstop

Ontario → Seattle

4h 7m

9:46 PM - 12:33 AM • nonstop

$389

Delta Airlines

Jul 23 - Jul 26, Economy

Ontario → Texas

5h 24m

6:35 PM - 11:59 PM • nonstop

Ontario → Texas

5h 28m

4:02 PM - 5:30 PM • nonstop

$391

Delta Airlines

Jun 25 - Jun 26, Economy

Ontario → Dallas

5h 15m

6:00 AM - 11:15 AM • nonstop

Ontario → Dallas

5h 16m

3:29 PM - 4:45 PM • nonstop

$753

American Airlines

Jul 30 - Aug 07, Economy

Ontario → Seattle

4h 9m

12:04 PM - 2:44 PM • nonstop

Ontario → Seattle

18h 30m

12:26 PM - 3:21 PM • nonstop

$1067

Alaska Airlines

Affordable Worldwide Flights from Ontario International (ONT)

Looking for cheap last-minute flight deals or the best round-trip flight from Ontario? Find the biggest savings on one-way and round-trip tickets right here. Search and compare low-cost domestic airfares and international flight deals from ONT to all the popular destinations of the world using our flight search and compare platform. Some top destinations where people fly most from Ontario are Seattle, Seattle, Las Vegas, Las Vegas, Honolulu and more.

FAQs on Flights from Ontario (ONT)

Which airlines fly from Ontario?

Airlines flying the most from Ontario (ONT)

What are the most popular destination from Ontario ( ONT )?

Travelers frequently travel to Cincinnati, Dallas, Miami, Oklahoma City, Seattle, Everett, Texas from Ontario

Airport Information: Ontario International (ONT)

IATA Code: ONT
Name: Ontario International
City: Ontario
Country: US
Latitude: 34.055999755859375
Longitude: -117.60099792480469

Ontario (ONT) Arrivals and Departures

Airline	Flight code	Arrival time	Status
Delta Airlines DAL771	B764	24th Jun, 2026 12:20 AM	Arriving
American Airlines AAL2123	B738	24th Jun, 2026 12:18 AM	Arriving
Delta Airlines DAL3124	A319	24th Jun, 2026 12:19 AM	Arriving
JetBlue Airways JBU823	A21N	24th Jun, 2026 12:17 AM	Arriving
United Airlines UAL2641	B752	24th Jun, 2026 12:18 AM	Arriving
Delta Airlines DAL2107	BCS3	24th Jun, 2026 12:10 AM	Arriving