✈️ Flight Guide: Denver (Any) → Ontario (ONT)

Ontario International Airport (ONT) is served by carriers such as Southwest Airlines, Alaska Airlines, American Airlines, Delta Air Lines, United Airlines and several low-cost regional carriers. For the cheapest economy fares, compare Southwest and low-fare fare sales from Alaska and discount promotions from other carriers; use flexible dates and sign up for fare alerts to catch flash sales. Nearby major cities served directly or via short connections include Los Angeles, San Diego, Las Vegas, Phoenix, and San Bernardino.

For domestic economy departures from Ontario International Airport (ONT), arrive at least 90 minutes before your scheduled departure to allow time for parking, TSA screening, and potential weekend congestion. If you need to check bags or travel during peak holiday months like December, allow 2 hours to avoid stress and to accommodate shuttle or parking delays.

Yes, Ontario International Airport (ONT) frequently offers direct economy flights to Las Vegas (Harry Reid International) and San Diego (San Diego International Airport) via carriers like Southwest and Alaska, often with competitive low-cost fares. Book 3–6 weeks in advance for regional routes or monitor weekday departures for the best economy deals.

December at Ontario International Airport (ONT) is a peak travel month due to holiday travel; book cheap economy seats early, aim for midweek flights, and consider early morning or late-night departures to avoid heavy crowds and higher fares. Use flexible-date search tools and set price alerts for ONT to major destinations like Las Vegas, Phoenix, and San Diego to capture last-minute discounts.

Ontario International Airport (ONT) provides shuttles, rideshare pickup zones, rental car facilities, public transit links, and short-term parking that are economical for budget travelers. Rideshare pickup areas are clearly signed at the arrivals curb, and several off-site economy parking lots offer shuttle service; pre-book a rental or off-site lot for lower costs.

Ontario International Airport (ONT) provides easy access to nearby major cities and top destinations including Los Angeles, San Bernardino, Riverside, Orange County (Anaheim), Las Vegas, San Diego, and Phoenix. These cities are commonly accessed by short flights, regional shuttles, or a 30–90 minute drive—making ONT a strategic gateway for Southern California and Southwestern travel.

Cheapest Economy (ECON) refers to the lowest available economy fare class offered on a route, typically with the most restrictions but the lowest price. These fares often include carry-on or limited baggage allowances and are non-refundable; compare with basic economy and standard economy to ensure you understand baggage and seat selection rules before booking.

Yes, Cheapest Economy (ECON) fares are commonly available on short-haul routes from Ontario International Airport (ONT) to nearby cities like Los Angeles, San Diego, Las Vegas, Phoenix, and Anaheim. Availability varies by airline and date, so use flexible-date searches and fare-comparison tools to find the lowest economy prices for these regional routes.

September is typically a shoulder-season month with reduced leisure demand, which can yield lower Cheapest Economy (ECON) prices. To secure the best September deals from Ontario International Airport (ONT), search for midweek flights, use flexible dates, and check for promotional sales from carriers serving ONT to destinations like Phoenix and Las Vegas.

Cheapest Economy (ECON) fare classes usually limit baggage allowances to one small personal item, with carry-on and checked bags incurring additional fees. Airlines vary, so check the specific carrier policy before booking; bringing just a personal item and minimizing checked luggage is the best way to keep costs low.

Seat selection and upgrades for Cheapest Economy (ECON) vary by airline—many restrict complimentary seat choice and offer paid upgrades or priority seats for an additional fee. If seat comfort or space matters, consider comparing basic economy with standard economy or booking early to secure available seats at reasonable costs.