
Ontario International Airport, located in Ontario, California, officially opened its doors on February 28, 1941, as part of the United States Army Air Corps' training efforts during World War II. Initially known as Ontario Army Air Field, it served as a critical training base for pilots and aircrews. After the war, the facility transitioned to civilian use, and in 1965, it was renamed Ontario International Airport to reflect its growing role in commercial aviation. Today, it remains a vital transportation hub in Southern California, serving millions of passengers annually and connecting the region to domestic and international destinations.
| Characteristics | Values |
|---|---|
| Airport Name | Ontario International Airport |
| IATA Code | ONT |
| ICAO Code | KONT |
| Opened | 1929 (as a small airport) |
| Commercial Service Began | 1941 |
| Location | Ontario, California, United States |
| Hub for | Formerly a hub for United Airlines and Continental Airlines |
| Focus City for | None currently |
| Operated by | Ontario International Airport Authority |
| Serves | Inland Empire region of Southern California |
| Elevation | 947 ft (289 m) |
| Website | flyontario.com |
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What You'll Learn
- Initial Construction Date: Ontario Airport's first construction phase began in the early 1940s
- Official Opening Year: The airport officially opened for operations in 1946
- First Commercial Flights: Commercial flights started in the late 1960s after expansion
- Renaming History: Originally Ontario International Airport, it was renamed in 2016 to Ontario Airport
- Terminal Development: Modern terminals were added in the 1990s to accommodate growing passenger traffic

Initial Construction Date: Ontario Airport's first construction phase began in the early 1940s
The initial construction of Ontario International Airport (ONT) in California traces its roots to the early 1940s, a period marked by significant aviation developments in the United States. The airport’s first construction phase began during this time, primarily driven by the growing need for military and civilian aviation infrastructure. World War II played a pivotal role in accelerating the airport’s development, as the U.S. government sought to expand its air transportation capabilities to support wartime efforts. The strategic location of Ontario, situated in Southern California, made it an ideal site for an airport that could serve both military and civilian purposes.
Construction activities in the early 1940s focused on establishing the basic framework of the airport, including runways, taxiways, and initial terminal facilities. The U.S. Army Air Forces (USAAF) took a keen interest in the project, recognizing the potential of Ontario Airport as a training and operational base. This military involvement ensured that the airport’s design and construction met rigorous standards, laying a solid foundation for its future expansion. By the mid-1940s, the airport had become operational, though its facilities were modest compared to what they would later become.
The early 1940s construction phase was characterized by rapid progress, despite the challenges posed by wartime resource constraints. Local and federal authorities collaborated to ensure the project’s success, emphasizing the airport’s dual role as a military asset and a civilian aviation hub. This period marked the beginning of Ontario Airport’s journey from a small airfield to a major regional airport. The initial infrastructure, though basic, was designed with scalability in mind, allowing for future upgrades and expansions as demand grew.
By the end of the 1940s, Ontario Airport had firmly established itself as a key aviation facility in Southern California. The first construction phase, initiated in the early 1940s, set the stage for decades of growth and development. While the airport’s early years were closely tied to military operations, its civilian role began to expand in the post-war era. This dual-purpose foundation, laid during the initial construction, ensured that Ontario Airport could adapt to changing aviation needs over time.
In summary, the initial construction date of Ontario Airport in the early 1940s was a critical milestone in its history. This phase not only addressed the immediate demands of World War II but also established a robust infrastructure that would support the airport’s evolution into a major transportation hub. The collaboration between military and civilian authorities during this period underscores the strategic importance of Ontario Airport from its very inception.
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Official Opening Year: The airport officially opened for operations in 1946
The Ontario International Airport, located in the city of Ontario, California, has a rich history that dates back to the mid-20th century. When discussing the question of when Ontario Airport opened, it is essential to highlight the Official Opening Year: The airport officially opened for operations in 1946. This milestone marked the beginning of its role as a vital transportation hub in Southern California. Initially, the airport was established to serve both military and civilian purposes, reflecting the post-World War II era's growing demand for air travel and aviation infrastructure.
The year 1946 is significant because it represents the formal commencement of Ontario Airport's operations as a public airport. Prior to this, the site had been used for aviation activities, but it was not until 1946 that it was officially designated for regular commercial and general aviation use. This transition was facilitated by the city of Ontario, which took over the facility and began developing it to meet the needs of the burgeoning aviation industry. The opening year underscores the airport's early contribution to regional connectivity and economic growth.
Following its official opening in 1946, Ontario Airport quickly became an important asset for the Inland Empire region. Its strategic location, coupled with the post-war boom in air travel, allowed it to grow steadily in both size and significance. The airport's early years were characterized by the expansion of runways, terminals, and services to accommodate increasing passenger and cargo traffic. This period laid the foundation for its future development into a major airport serving millions of travelers annually.
It is crucial to emphasize that 1946 is the definitive answer to the question of when Ontario Airport opened, as it marks the year the airport began operating as a fully functional civilian facility. While the site had been used for aviation purposes before this date, the official opening in 1946 signifies its formal establishment as a public airport. This distinction is important for historical accuracy and understanding the airport's evolution over the decades.
In summary, the Official Opening Year: The airport officially opened for operations in 1946 is a pivotal moment in the history of Ontario International Airport. This year not only marks the beginning of its operations but also highlights its early role in meeting the aviation needs of Southern California. From its humble beginnings in 1946 to its current status as a major regional airport, Ontario Airport's journey is a testament to its enduring importance in the region's transportation network.
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First Commercial Flights: Commercial flights started in the late 1960s after expansion
The Ontario International Airport, located in Ontario, California, has a rich history that dates back to its early days as a small airfield. The airport’s journey toward becoming a commercial hub began in the mid-20th century, with significant milestones leading up to the introduction of its first commercial flights. After its initial establishment and use for general aviation, the airport underwent substantial expansion in the 1960s to accommodate larger aircraft and increased passenger traffic. This expansion was a pivotal moment, setting the stage for the airport to transition from a regional airfield to a facility capable of handling commercial operations.
By the late 1960s, Ontario Airport was ready to welcome its first commercial flights, marking a new era in its history. The expansion efforts, which included the construction of longer runways and improved terminal facilities, were specifically designed to meet the demands of commercial airlines. These upgrades ensured that the airport could safely and efficiently handle scheduled passenger flights, a significant leap from its earlier role as a general aviation hub. The introduction of commercial service was a direct result of the foresight and investment in infrastructure during this period.
The first commercial flights at Ontario Airport were operated by major airlines of the time, which recognized the potential of the Inland Empire region as a growing market for air travel. These initial routes connected Ontario to key destinations within California and neighboring states, providing residents with convenient access to air transportation. The late 1960s were a transformative period for the airport, as it began to establish itself as a vital component of Southern California’s aviation network. The success of these early commercial operations laid the foundation for further growth and development in the decades that followed.
As commercial flights took off, Ontario Airport quickly became a preferred alternative to the busier Los Angeles International Airport (LAX), offering travelers a more convenient and less congested option. The airport’s strategic location in the Inland Empire, coupled with its modern facilities, made it an attractive choice for both airlines and passengers. The late 1960s expansion and the subsequent launch of commercial flights were critical steps in the airport’s evolution, solidifying its role as a key player in the region’s transportation infrastructure.
In summary, the first commercial flights at Ontario Airport in the late 1960s were the culmination of deliberate expansion efforts aimed at transforming the facility into a modern aviation hub. These flights not only marked a new chapter in the airport’s history but also addressed the growing demand for air travel in the Inland Empire. The success of this transition set the stage for Ontario Airport’s continued growth and its enduring importance as a commercial airport in Southern California.
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Renaming History: Originally Ontario International Airport, it was renamed in 2016 to Ontario Airport
The history of Ontario Airport is deeply intertwined with the growth and development of Southern California. Originally known as Ontario International Airport, it began its operations in 1929, primarily serving as a small airfield for general aviation. Over the decades, the airport expanded its role, becoming a significant hub for both domestic and international flights. Its strategic location in the Inland Empire made it a vital transportation link for the region, connecting residents and businesses to major cities across the United States and beyond. The airport's early years were marked by steady growth, with infrastructure improvements and the addition of commercial airlines to meet the increasing demand for air travel.
By the mid-20th century, Ontario International Airport had established itself as a key player in California's aviation network. During the 1960s and 1970s, it underwent significant upgrades, including the construction of new terminals and runways to accommodate larger aircraft and more passengers. The airport's international designation reflected its ability to handle flights from Mexico and other nearby countries, further solidifying its importance in the region. However, as larger airports like Los Angeles International Airport (LAX) expanded their operations, Ontario faced challenges in maintaining its international status and passenger numbers began to decline in the early 2000s.
The decision to rename Ontario International Airport to Ontario Airport in 2016 was part of a broader strategy to revitalize the airport and redefine its identity. This change came after years of negotiations and efforts by local officials to regain control of the airport's operations from Los Angeles World Airports (LAWA), which had managed it since 1967. The renaming aimed to simplify the airport's branding and emphasize its focus on serving the local community and regional travelers. By dropping "International" from its name, the airport signaled a shift toward prioritizing domestic flights and enhancing its role as a convenient alternative to busier airports like LAX.
The renaming also coincided with significant investments in infrastructure and marketing to attract more airlines and passengers. Ontario Airport Authority (ONTA), which took over management in 2016, implemented initiatives to improve the passenger experience, expand flight options, and promote the airport's accessibility. These efforts began to pay off, with several airlines announcing new routes and increased service to Ontario. The airport's rebranding as Ontario Airport marked a new chapter in its history, one focused on growth, innovation, and meeting the evolving needs of the Inland Empire.
Today, Ontario Airport continues to play a crucial role in the region's transportation network, offering a range of domestic flights and serving millions of passengers annually. The 2016 renaming was not just a change in title but a strategic move to reposition the airport for success in a competitive aviation landscape. As it looks to the future, Ontario Airport remains committed to its mission of providing efficient, convenient, and reliable air travel options for the communities it serves. Its history, from its humble beginnings in 1929 to its rebranding in 2016, reflects the resilience and adaptability of an airport that has consistently evolved to meet the challenges and opportunities of its time.
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Terminal Development: Modern terminals were added in the 1990s to accommodate growing passenger traffic
The Ontario International Airport (ONT), located in Ontario, California, has a rich history of development and expansion to meet the demands of increasing air travel. While the airport’s origins trace back to the 1920s, its transformation into a modern aviation hub began in earnest in the latter half of the 20th century. By the 1990s, the airport faced significant growth in passenger traffic, necessitating the addition of modern terminals to enhance capacity and improve the overall travel experience. This period marked a pivotal phase in the airport’s terminal development, as it transitioned from a regional airfield to a major gateway in Southern California.
The 1990s expansion focused on constructing state-of-the-art terminals designed to accommodate the surge in passenger numbers. Terminal 2 and Terminal 4 were the primary additions during this time, replacing older facilities that had become inadequate for the airport’s growing operations. These new terminals were equipped with advanced amenities, including spacious check-in areas, efficient security checkpoints, and expanded gate capacity. The design emphasized functionality and passenger comfort, reflecting the industry’s shift toward creating more user-friendly airport environments. The modernization efforts also included improved baggage handling systems and enhanced retail and dining options, setting a new standard for regional airports.
The development of these terminals was not just about increasing capacity but also about positioning Ontario Airport as a competitive alternative to larger airports in the region, such as Los Angeles International Airport (LAX). By offering modern facilities and streamlined operations, ONT aimed to attract more airlines and passengers, particularly those seeking a less congested travel experience. The strategic location of the airport, combined with its upgraded infrastructure, made it an appealing option for both domestic and international carriers. This period of terminal development played a crucial role in solidifying ONT’s role as a key player in California’s aviation network.
Funding for the terminal projects came from a combination of sources, including airport revenue, federal grants, and passenger facility charges. The investments were justified by the airport’s steady growth in passenger traffic, which had been increasing annually since the 1980s. The 1990s expansion was also part of a broader master plan to ensure the airport could handle projected demand well into the 21st century. This forward-thinking approach allowed ONT to stay ahead of the curve, even as air travel continued to grow exponentially in the following decades.
The completion of the modern terminals in the 1990s marked a significant milestone in Ontario Airport’s history, reflecting its commitment to meeting the needs of a rapidly evolving aviation industry. These developments not only improved operational efficiency but also enhanced the airport’s reputation as a convenient and passenger-friendly hub. As ONT continues to evolve, the terminal expansions of the 1990s remain a testament to its ability to adapt and thrive in response to changing demands. This era of growth laid the foundation for the airport’s ongoing success and its continued role as a vital transportation asset for the Inland Empire region.
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Frequently asked questions
Ontario Airport officially opened in 1941 as Ontario Army Air Field, serving as a military training base during World War II.
Ontario Airport transitioned to civilian use in 1946 after the end of World War II, though it continued to serve both military and commercial purposes for a time.
Ontario Airport became a major commercial airport in the 1960s, with significant expansion and modernization efforts taking place throughout the decade.
Ontario Airport adopted the name Ontario International Airport in 1982 to reflect its growing role in regional and international air travel.











































