
Ontario International Airport (ONT), located in the heart of Southern California, serves as a convenient gateway for travelers visiting the Inland Empire and surrounding areas. Several major airlines operate flights to and from Ontario Airport, offering a range of domestic and limited international destinations. Key carriers include Southwest Airlines, American Airlines, Delta Air Lines, United Airlines, and Frontier Airlines, each providing multiple daily flights to popular hubs such as Las Vegas, Phoenix, Denver, and Dallas. Additionally, seasonal and charter services may be available, catering to leisure travelers. With its strategic location and growing route network, Ontario Airport continues to expand its offerings, making it an increasingly popular choice for both business and leisure travelers in the region.
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What You'll Learn

Major U.S. carriers serving Ontario Airport
Ontario International Airport (ONT), located in the heart of Southern California, is a key hub for both domestic and international travel. Among the airlines serving this airport, several major U.S. carriers play a significant role in connecting Ontario to various destinations across the country. These carriers are known for their extensive networks, frequent flights, and reliable service, making them popular choices for travelers.
American Airlines is one of the prominent U.S. carriers operating at Ontario Airport. As a member of the Oneworld alliance, American Airlines offers a wide range of domestic and international flights. From ONT, passengers can fly non-stop to major hubs like Phoenix (PHX), Dallas/Fort Worth (DFW), and Chicago (ORD). These connections provide travelers with access to American Airlines' extensive global network, making it a convenient choice for both business and leisure travelers. The airline's presence at Ontario Airport ensures that passengers have multiple daily flight options to key destinations.
Delta Air Lines, another major player, also serves Ontario International Airport, providing a vital link to its hub in Salt Lake City (SLC) and other destinations. Delta's service from ONT includes multiple daily flights, offering flexibility for travelers. The airline's focus on customer service and its SkyMiles loyalty program make it an attractive option for frequent flyers. With Delta, passengers can easily connect to a vast array of domestic and international routes, further enhancing the airport's connectivity.
Southwest Airlines stands out as a major low-cost carrier at Ontario Airport, known for its extensive domestic network. Southwest offers numerous flights from ONT to cities such as Las Vegas (LAS), Denver (DEN), and Oakland (OAK). The airline's unique approach to boarding and its generous baggage policy have made it a favorite among budget-conscious travelers. Southwest's presence significantly contributes to the airport's overall passenger traffic and provides a competitive alternative to other major carriers.
United Airlines is also a key U.S. carrier at Ontario, offering non-stop flights to its hubs in Denver (DEN) and San Francisco (SFO). These routes are essential for travelers looking to connect to United's global network. The airline's MileagePlus program and its focus on premium services appeal to a wide range of passengers. United's operations at ONT ensure that travelers have convenient options for both domestic and international travel.
In summary, Ontario International Airport is well-served by several major U.S. carriers, each offering unique advantages and extensive networks. American Airlines, Delta Air Lines, Southwest Airlines, and United Airlines collectively provide a comprehensive range of flight options, catering to diverse travel needs. Their presence at ONT underscores the airport's importance as a strategic gateway in Southern California, facilitating convenient and efficient air travel across the United States and beyond.
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International airlines operating flights to Ontario
Ontario International Airport (ONT), located in the heart of Southern California, serves as a convenient gateway for both domestic and international travelers. While it primarily handles domestic flights, several international airlines operate routes to and from Ontario, connecting the region to key destinations worldwide. These airlines provide essential links for business and leisure travelers, offering a range of services and schedules to meet diverse needs.
One of the prominent international airlines serving Ontario Airport is Volaris, a low-cost Mexican carrier. Volaris operates multiple weekly flights between Ontario and several Mexican cities, including Guadalajara, Morelia, and Mexico City. These routes are particularly popular among travelers visiting family or exploring cultural and historical sites in Mexico. Volaris is known for its affordable fares and straightforward booking process, making it a preferred choice for budget-conscious passengers.
Another key international airline operating at Ontario Airport is Aeromexico Connect, the regional subsidiary of Aeromexico. This airline provides seamless connections between Ontario and Mexico City, offering a more premium travel experience compared to low-cost carriers. Aeromexico Connect is ideal for travelers seeking comfort and convenience, with amenities such as in-flight entertainment and a loyalty program. Its flights are often timed to connect with Aeromexico’s extensive global network, enabling passengers to reach destinations beyond Mexico.
Air Canada also plays a significant role in connecting Ontario to international destinations, particularly through its flights to Toronto Pearson International Airport (YYZ). These flights cater to both business and leisure travelers, providing a direct link to Canada’s largest city. Air Canada’s service includes options for economy, premium economy, and business class, ensuring travelers can choose the level of comfort that suits their preferences. The airline’s flights are particularly useful for those looking to connect to other international destinations via Toronto.
In addition to these carriers, WestJet, a Canadian low-cost airline, offers seasonal flights between Ontario and Calgary International Airport (YYC). These routes are especially popular during peak travel seasons, such as summer and winter holidays. WestJet’s flights provide an affordable and efficient way to travel between Southern California and Western Canada, with connections to other Canadian cities and international destinations available through its hub in Calgary.
While Ontario Airport’s international flight options are primarily focused on North American destinations, these airlines collectively ensure that travelers have reliable and convenient access to key international hubs. Whether flying for business, leisure, or to visit family, passengers can choose from a variety of carriers that offer competitive pricing, comfortable travel experiences, and strategic connections to global destinations. For the most up-to-date information on schedules and routes, travelers are encouraged to check directly with the airlines or the Ontario International Airport website.
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Low-cost carriers available at Ontario Airport
Ontario International Airport (ONT) in California is a convenient hub for travelers seeking affordable flight options, thanks to its growing list of low-cost carriers. Among the airlines operating at ONT, Southwest Airlines stands out as a prominent low-cost carrier. Known for its no-fee policy on checked bags and flexible ticketing, Southwest offers numerous domestic routes from Ontario, including popular destinations like Las Vegas, Phoenix, and Denver. The airline’s extensive network and customer-friendly policies make it a top choice for budget-conscious travelers.
Another key player in the low-cost segment at Ontario Airport is Frontier Airlines. Frontier is renowned for its ultra-low fares, though additional fees may apply for services like seat selection and carry-on baggage. The airline connects Ontario to several cities across the U.S., such as Chicago, Atlanta, and Austin, making it an attractive option for those willing to forgo extra amenities in exchange for lower prices. Frontier’s focus on affordability aligns well with the needs of leisure travelers and those planning short trips.
Spirit Airlines also operates at Ontario Airport, offering another ultra-low-cost option for travelers. Spirit’s business model emphasizes base fares at minimal prices, with additional charges for add-ons like snacks, drinks, and baggage. Despite these fees, Spirit remains a popular choice for its competitive pricing on routes to destinations like Dallas, Las Vegas, and Orlando. Travelers who pack light and prioritize cost savings often find Spirit to be a viable option.
In addition to these carriers, Breeze Airways has emerged as a newer low-cost option at Ontario Airport. Breeze focuses on providing non-stop service to underserved routes, offering a refreshing alternative for travelers seeking direct flights at reasonable prices. While its network is still growing, Breeze has already introduced flights from Ontario to cities like San Francisco and Provo, Utah, with plans to expand further. This airline’s emphasis on convenience and affordability makes it a noteworthy addition to ONT’s low-cost carrier lineup.
Lastly, Allegiant Air caters to travelers looking for budget-friendly flights to leisure destinations. Allegiant specializes in connecting smaller airports to vacation hotspots, and at Ontario Airport, it offers flights to places like Las Vegas, Phoenix, and Santa Rosa. While Allegiant’s schedule may be less frequent compared to larger carriers, its low fares and focus on recreational travel make it an appealing choice for those planning getaways. Together, these low-cost carriers ensure that Ontario Airport remains accessible and affordable for a wide range of travelers.
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Seasonal or limited-service airlines at the airport
Ontario International Airport (ONT) in California serves a variety of airlines, including several that operate on a seasonal or limited-service basis. These airlines typically adjust their schedules based on demand, often increasing flights during peak travel seasons such as summer, holidays, or special events. While major carriers like Southwest, American, and Delta maintain year-round service, seasonal or limited-service airlines provide additional options for travelers during specific times of the year.
One notable seasonal airline serving Ontario Airport is Sun Country Airlines. Based in Minnesota, Sun Country offers flights to leisure destinations, including Ontario, primarily during the winter months when demand for warm-weather getaways is high. Their service to ONT often includes routes to and from Minneapolis-Saint Paul (MSP), catering to travelers seeking to escape the cold Midwest winters. These flights are typically scheduled from late fall through early spring, with frequencies varying based on demand.
Another airline providing limited service to Ontario Airport is Frontier Airlines. While Frontier operates year-round from ONT, certain routes are only available seasonally. For example, flights to destinations like Denver (DEN) or Las Vegas (LAS) may increase during summer or holiday periods when travel to these cities spikes. Frontier’s ultra-low-cost model makes these seasonal routes particularly attractive for budget-conscious travelers.
Allegiant Air is another carrier that operates on a limited-service basis at Ontario Airport. Allegiant specializes in connecting smaller cities to leisure destinations, and their service to ONT often includes seasonal routes to places like Phoenix-Mesa (AZA) or Provo, Utah (PVU). These flights are typically scheduled during peak travel seasons, such as summer vacations or winter holidays, and are tailored to meet the demand for affordable, direct flights to popular destinations.
Lastly, Volaris, a Mexican low-cost carrier, offers limited service to Ontario Airport, primarily catering to the Mexican-American community in the region. Their flights to destinations like Guadalajara (GDL) or Mexico City (MEX) may operate on a seasonal or reduced schedule, depending on demand. These routes are particularly popular during holidays and cultural events, providing essential connections for families and travelers visiting Mexico.
Travelers planning to use seasonal or limited-service airlines at Ontario Airport should monitor flight schedules closely, as availability and frequencies can change rapidly. Booking in advance is often recommended to secure the best fares and ensure availability during peak seasons. Additionally, checking directly with the airline or using flight-tracking tools can provide the most up-to-date information on seasonal routes and schedules.
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Regional airlines with routes to Ontario, California
Ontario International Airport (ONT) in California serves as a convenient hub for both domestic and international travelers, with several regional airlines offering routes to and from the airport. These airlines play a crucial role in connecting Ontario to various destinations across the United States, providing travelers with flexibility and accessibility. Among the regional carriers, American Eagle, operated by Envoy Air, Piedmont Airlines, and PSA Airlines, offers multiple daily flights to key hubs like Phoenix (PHX) and Dallas/Fort Worth (DFW). These routes are particularly useful for passengers looking to connect to larger networks for both business and leisure travel.
Another prominent regional airline serving Ontario Airport is Delta Connection, which operates through subsidiaries such as SkyWest Airlines and Compass Airlines. Delta Connection provides seamless connections to major hubs like Salt Lake City (SLC) and Seattle (SEA), enabling travelers to reach a wide range of destinations across the country. The airline’s focus on reliability and frequent scheduling makes it a popular choice for regional travelers flying in and out of Ontario.
United Express is another significant regional carrier at ONT, with flights operated by SkyWest Airlines, Air Wisconsin, and Mesa Airlines. United Express connects Ontario to hubs like Denver (DEN) and San Francisco (SFO), offering passengers convenient options for both direct and connecting flights. The airline’s extensive network ensures that travelers can easily access destinations across the western United States and beyond.
For those seeking budget-friendly regional travel, Southwest Airlines stands out as a key player at Ontario Airport. While Southwest is not traditionally categorized as a regional airline, its focus on shorter, point-to-point routes within the western U.S. makes it a vital option for travelers. Southwest offers multiple daily flights to destinations like Las Vegas (LAS), Sacramento (SMF), and Oakland (OAK), providing affordability and convenience for regional travelers.
Lastly, Alaska Airlines operates regional routes from Ontario Airport, connecting passengers to cities like Portland (PDX) and Seattle (SEA). While Alaska Airlines also serves longer routes, its regional focus ensures that travelers have efficient options for reaching key destinations in the Pacific Northwest. The airline’s reputation for customer service and on-time performance further enhances its appeal for regional travelers.
In summary, regional airlines such as American Eagle, Delta Connection, United Express, Southwest Airlines, and Alaska Airlines provide essential connectivity to and from Ontario International Airport. These carriers offer a mix of convenience, affordability, and reliability, making Ontario a strategic gateway for regional travel across the western United States.
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Frequently asked questions
Airlines serving Ontario Airport include American Airlines, Delta Air Lines, Southwest Airlines, United Airlines, Alaska Airlines, Frontier Airlines, and Volaris.
Yes, Ontario Airport offers limited international flights, primarily to Mexico, with airlines like Volaris providing service.
Major U.S. airlines operating at Ontario Airport are American Airlines, Delta Air Lines, Southwest Airlines, United Airlines, and Alaska Airlines.
Yes, low-cost carriers such as Frontier Airlines and Southwest Airlines operate at Ontario Airport.
Yes, airlines like American Airlines, Delta Air Lines, and United Airlines offer direct or connecting flights from East Coast cities to Ontario Airport.








































