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Cheap Flights from Lexington (LEX) to Ontario (ONT)

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      Travellers and cabin class, 1 Adult, Economy

      Compare Lexington Blue Grass to Ontario International flight deals

      Find the cheapest month or even day of the year to fly to Ontario International

      Book the best Ontario International fare with no extra fees

      Flight deals from Lexington Blue Grass to Ontario International

      Looking for a cheap last-minute deal or the best return flight from Lexington Blue Grass Airport to Ontario International Airport? If you want to travel next month, return fares start from $859. Find the lowest prices on one-way and return tickets right here.
      Ontario.$497 per passenger.Departing Mon, 7 Dec, returning Mon, 14 Dec.Return flight with Delta.Outbound indirect flight with Delta, departs from Lexington Blue Grass on Mon, 7 Dec, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Mon, 14 Dec, arriving in Lexington Blue Grass.Price includes taxes and charges.From $497, select.
      Ontario.$837 per passenger.Departing Fri, 18 Sep, returning Sun, 20 Sep.Return flight with Delta.Outbound indirect flight with Delta, departs from Lexington Blue Grass on Fri, 18 Sep, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Sun, 20 Sep, arriving in Lexington Blue Grass.Price includes taxes and charges.From $837, select.
      Ontario.$859 per passenger.Departing Thu, 22 Oct, returning Tue, 27 Oct.Return flight with Delta.Outbound indirect flight with Delta, departs from Lexington Blue Grass on Thu, 22 Oct, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Tue, 27 Oct, arriving in Lexington Blue Grass.Price includes taxes and charges.From $859, select.
      Ontario.$888 per passenger.Departing Tue, 24 Nov, returning Fri, 27 Nov.Return flight with Delta.Outbound indirect flight with Delta, departs from Lexington Blue Grass on Tue, 24 Nov, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Fri, 27 Nov, arriving in Lexington Blue Grass.Price includes taxes and charges.From $888, select.

      Find the cheapest month to fly from Lexington Blue Grass to Ontario International

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Lexington Blue Grass to Ontario International flights are currently cheapest in December.
      Sep
      from $837
      Oct
      from $859
      Nov
      from $888
      Dec
      from $497
      Jan
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      Feb
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      Mar
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      Apr
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      May
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      Jun
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      Jul
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      Aug
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      Lexington Blue Grass to Ontario International: Alternative routes

      Compare routes from Lexington Blue Grass to Ontario below. You may find an airport to fly into that's cheaper, faster, or easier than Ontario International.

      Ontario International

      4km from central Ontario
      Closest
      from $497
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      San Bernardino Norton AFB

      39km from central Ontario
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      Santa Ana John Wayne

      48km from central Ontario
      from $539
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      Long Beach Municipal

      54km from central Ontario
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      Hawthorne

      65km from central Ontario
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      Burbank

      67km from central Ontario
      from $564
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      Los Angeles International

      71km from central Ontario
      Cheapest
      from $477
      Search flights

      Lexington to Ontario: Flight information

      The things to know before you go.
      Cheapest flight found$497
      Cheapest month to flyDecember

      Finding cheap flights from Lexington Blue Grass to Ontario International: Frequently asked questions

      The best price we found for a return flight from Lexington Blue Grass to Ontario International is $497. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
      Currently, there are no airlines that fly direct from Lexington Blue Grass to Ontario International. But we found flights with one or more stops from $497.
      As of September 2026, there are no flights flying from Lexington Blue Grass to Ontario International.
      The cheapest month to fly from Lexington Blue Grass to Ontario International is usually December.
      After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Lexington Blue Grass Airport to Ontario International Airport on Monday, 7 December 2026.
      No airlines currently offer direct flights between Lexington Blue Grass Airport and Ontario International Airport. Most routes have one or more stops.
      We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Ontario International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

      We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Ontario is around 40 days in advance, so don’t leave your flight to the last minute.

      Currently, Delta offers the cheapest flight tickets to Ontario International.

      Flying from Lexington Blue Grass Airport (LEX) to Ontario International Airport (ONT): what you need to know

      • The timezone in Ontario is UTC-8, which is three hours behind Lexington.

      • For a stress-free journey, arrive at the airport two hours ahead of international flights and one hour before domestic departures. This way, you can comfortably board your LEX to ONT flight.

      • If you're taking off during a major holiday or other peak periods, allow extra time. A good rule is two hours before domestic flights and up to four hours before international departures. Security and check-in lines will be longer.

      • We make it a cinch to book a flight with a stopover. To see your options for tickets from Lexington Blue Grass Airport to Ontario International Airport, deselect 'Direct flights only.' Then, pick a flight with a stop long enough to explore the city of your choice. Popular stopovers between LEX and ONT include:

        • Atlanta Hartsfield-Jackson Airport

        • Dallas Fort Worth International Airport

        • Harry Reid International Airport

      How to find the cheapest flights from Lexington Blue Grass Airport (LEX) to Ontario International Airport (ONT)

      • $526 is the lowest price for a one-way Lexington Blue Grass Airport to Ontario International Airport flight. Return flights start from $497. These prices may change based on demand.

      • Don't leave things to the last moment. You're more likely to get cheap tickets from LEX to ONT if you book in advance. Airlines often have some terrific early bird rates.

      • Getting cheap flights from Lexington Blue Grass Airport to Ontario International Airport is easy if you can be flexible with your travel dates. Use the 'Whole month' search function to see the lowest prices across the month and bag a great deal.

      • Spend less time searching for cheap flights from LEX to ONT by setting up a Price Alert. You'll receive an email or push notification on the app when fares go down.

      • Tailor your trip with filters. Choose your ideal departure and arrival times, airlines and total journey duration. You can also sort the results by 'Fastest,' 'Best' or 'Cheapest' flights from Lexington Blue Grass Airport to Ontario International Airport.

      Handy information about Lexington Blue Grass Airport (LEX)

      • You'll find LEX at 4000 Terminal Drive, Suite 206.

      • Of the flights that depart from Lexington Blue Grass Airport, 75% touch down on time at their destination.

      • Central Lexington to Lexington Blue Grass Airport is around 10 kilometres. Depending on traffic, it'll take about 20 minutes to get there if you're driving, ride-sharing or catching a taxi.

      • The journey on public transport takes roughly 35 minutes.

      • Need a convenient hotel near LEX? If you've booked an early flight from Lexington Blue Grass Airport to Ontario International Airport, these accommodation options will put you moments from your check-in counter:

      Arriving at Ontario International Airport (ONT)

      When to fly to Ontario International Airport (ONT)

      • July is the most popular month for flights from Lexington Blue Grass Airport to Ontario International Airport. For a quieter experience, visit Ontario in March.

      • Lock in your flight from Lexington Blue Grass Airport to Ontario International Airport for August if you'd like to go to Ontario during its warmest month. Expect temperatures of between 16ºC (61ºF) and 36ºC (97ºF).

      • If you'd rather travel in cooler conditions, look for a cheap ticket from LEX to ONT in February. Average temperatures are between 4ºC (39ºF) and 24ºC (75ºF) then.

      Explore more of the United States

      • Los Angeles is just one of the many places in the United States waiting to be explored after you've seen Ontario. Around 56 kilometres away to the west, its best attractions include Hollywood Sign, Universal Studios Hollywood and Hollywood Bowl.

      • Around 153 kilometres south of Ontario, San Diego is another favourite stop in the United States. No visit is complete without checking out San Diego Zoo, San Diego Balboa Park and USS Midway Museum.

      Plan smart, explore more

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      Plan the rest of your trip from Lexington to Ontario

      Prices shown on this page are estimated lowest prices only. Found in the last 12 days.