Best Flights starting from $206
from$206economy
San Francisco (SFO)
Wed, Apr 29
One-way
Ontario (ONT)
—
from$244economy
San Francisco (SFO)
Thu, Apr 30
One-way
Ontario (ONT)
—
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Other Options for This Route
Other Destinations
San Francisco (SFO) to Los Angeles (LAX) in April from $44
From $44
San Francisco (SFO) to Los Angeles (Any) in April from $50
From $50
San Francisco (SFO) to Las Vegas (Any) in April from $56
From $56
San Francisco (SFO) to San Diego (Any) in April from $56
From $56
San Francisco (SFO) to Newark (EWR) in April from $73
From $73
San Francisco (SFO) to Las Vegas (LAS) in April from $73
From $73
Flights from Other Cities
Denver (Any) to Ontario (ONT) in April from $56
From $56
Las Vegas (LAS) to Ontario (ONT) in April from $56
From $56
Portland (PDX) to Ontario (ONT) in April from $89
From $89
Las Vegas (LAS) to Ontario (ONT) in April from $125
From $125
Las Vegas (Any) to Ontario (ONT) in April from $125
From $125
San Antonio (SAT) to Ontario (ONT) in April from $135
From $135
✈️ Flight Guide: San Francisco (SFO) → Ontario (ONT)
Complete travel information for your April journey
Departing from San Francisco (SFO) FAQs
Ontario International Airport (ONT) is served by several major and low-cost carriers including Southwest Airlines, Alaska Airlines, American Airlines, Delta Air Lines and seasonal low-cost operators. For the cheapest economy fares, compare budget carriers and watch flash sales — Southwest and Alaska frequently offer competitive base fares from ONT, while major carriers run occasional economy sales. Use price alerts and flexible date search to lock in the best cheap flights from ONT.
For domestic economy departures from Ontario International Airport (ONT), arrive at least 90 minutes before your flight during regular hours and 2 hours during peak holiday travel or early morning flights. Allow extra time for checked baggage drop, TSA screening congestion (especially on Mondays and Fridays), and rental car returns. Check your airline's recommended arrival time and set a mobile boarding pass to speed up processing.
Travelers often use Ontario International Airport (ONT) to reach Los Angeles, Anaheim (home to Disneyland), Riverside, San Bernardino, San Diego, Las Vegas and Phoenix. ONT is a cost-friendly alternative to Los Angeles International for many Southern California trips and often features cheaper economy flights to Las Vegas, Phoenix, Denver and major hubs.
Yes — April often has competitive economy fares from Ontario International Airport (ONT) due to shoulder-season demand after spring break and before summer travel peaks. Airlines sometimes release spring fare sales or targeted flash deals for flights to leisure destinations like Las Vegas, Phoenix and Denver. Set fare alerts and check weekly — booking 3–8 weeks ahead in April can capture low fares.
Ontario International Airport (ONT) provides rental car centers, on-site ride-hailing/ride-share pickup zones, local shuttle services, and regional public transit connections. For Anaheim or downtown Los Angeles, many travelers prefer rental cars or shared shuttle services; Metrolink commuter rail and connecting shuttles serve regional transit needs. Compare cost and travel time — ground rides from ONT to Anaheim are typically 25–45 minutes, depending on traffic.
Direct flights from Ontario International Airport (ONT) can save time and sometimes money, particularly on short-haul routes like Las Vegas or Phoenix. However, connecting itineraries can be cheaper for long-haul economy travel if you’re flexible with travel dates and willing to accept longer total travel time. Compare total itinerary cost, baggage fees, and connection risk when choosing between direct and connecting flights.
Arriving at Ontario (ONT) FAQs
Arrivals labeled 'Cheapest Economy (ECO)' indicate itineraries focused on the lowest available economy fares across multiple carriers and connecting hubs. Use flexible date searches, compare budget airlines, and set fare alerts to capture these lowest economy prices. Prioritize total trip cost (fare plus bags and seat fees) rather than base fare alone to find true cheapest arrivals.
Popular cheap-economy arrival destinations from ONT commonly include Las Vegas (for short-haul bargains), Phoenix, Denver, San Francisco, and major East Coast hubs like Los Angeles area to New York (JFK) or Chicago (ORD) when fares align. Seasonal promotions and low-cost carrier routes can expand the list; always compare routes for the best economy price.
Yes — December features a split market: early December can yield cheap economy arrivals, while mid-December through New Year's sees high prices. To secure the cheapest economy arrival in December, book early (8+ weeks) and avoid peak holiday travel dates. Consider arriving on off-peak days and using alternate airports to lower costs.
Cheapest economy tickets often come with seat assignment fees, carry-on restrictions, and non-refundable terms. Baggage allowances may be limited to personal items only unless you pay for additional services. Review fare rules carefully at booking and consider bundled economy options if you need checked luggage or seat selection.
Connecting airports can reduce base fare but add transfer times and potential baggage/connection risks. Choose layovers with minimum connection time buffers and stick with single-ticket itineraries to protect baggage and simplify rebooking if disruptions occur. For the lowest economy fares, balance savings against the extra time and inconvenience of connections.
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Events & Festivals Impacting ONT Fares — Plan Ahead for Cheapest Economy Travel
Check event calendars before booking cheap economy flights from ONT and consider alternative dates to save.
Best Time to Fly from ONT — Cheapest Months & Booking Windows
Plan your trip around shoulder-season months and set fare alerts to capture the best cheap economy deals from ONT.
Direct vs Connecting Flights from ONT — Which Saves Money in Economy?
Compare direct and connecting economy options from ONT using price + time metrics to choose the best value.
Airline Comparison for Economy Travel from ONT — Who Offers the Best Cheap Fares?
Southwest Airlines often competes well on price with two free checked bags on many fares, whereas Alaska and major legacy carriers may offer more frequent schedule options but charge for checked bags. Low-cost carriers may have lower base fares but add fees for seats and carry-ons.
Compare all-in economy prices across carriers from ONT and book the option that offers the best balance of price, schedule and baggage policy.
Seasonal Travel Tips for Cheap Economy Flights from ONT
Apply these seasonal tips when searching for cheap economy flights from ONT to maximize savings and minimize travel hassles.
ONT Flight Times and Schedules — Typical Durations & Best Times to Fly
Compare flight times from ONT and choose the most convenient cheap economy schedule for your trip.
Cheap Flights from Ontario International Airport (ONT) — Booking, Tips & Carriers
To find cheap economy flights from Ontario International Airport (ONT), combine flexible dates, multiple search engines, and fare alerts. Consider low-cost carriers and be mindful of ancillary fees which can make a low base fare more expensive overall.
Start a price alert for cheap flights from ONT today and compare economy fares across major carriers.