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Las Vegas to Ontario flights in December 2026 from $23 LAS → ONT

McCarran International Airport (LAS) → Ontario International Airport (ONT)

For departures in December 2026, the cheapest return found recently is $43 with Frontier Airlines, 30 Dec – 31 Dec, found 2 days ago. The cheapest one-way found recently is $23 with Frontier Airlines, 31 Dec, found yesterday.

Return

In December 2026, the cheapest return fare on each of 3 departure dates is usually $42 to $45. Across all 8 departure dates we hold on this route, it is usually $43 to $90. Of the 2 months with enough return fares to compare, December 2026 is usually the cheapest.

Cheapest return found recently

$43

30 Dec – 31 Dec · Frontier Airlines

McCarran International Airport (LAS) → Ontario International Airport (ONT)

out nonstop, back nonstop

found 2 days ago

See prices for these datesCheck today's price

Cheapest we hold, of any age

$42

25 Dec – 1 Jan 2027 · Frontier Airlines

McCarran International Airport (LAS) → Ontario International Airport (ONT)

out nonstop, back nonstop

found 4 days ago

See prices for these datesCheck today's price

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The cheapest dates in December 2026

DatesFromAirlineStopsFound
25 Dec – 1 Jan 2027$42Frontier Airlinesout nonstop, back nonstopfound 4 days agoSee prices for these dates
30 Dec – 31 Dec$43Frontier Airlinesout nonstop, back nonstopfound 2 days agoSee prices for these dates
4 Dec – 6 Dec$47Frontier Airlinesout nonstop, back nonstopfound 4 days agoSee prices for these dates

Every date we hold

3 departure dates

4 Dec – 6 Dec: $47, found 4 days ago25 Dec – 1 Jan 2027: $42, found 4 days ago30 Dec – 31 Dec: $43, found 2 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
4 Dec – 6 Dec$47Frontier AirlinesMcCarran International Airport (LAS) → Ontario International Airport (ONT)out nonstop, back nonstopfound 4 days agoSee prices for these dates
25 Dec – 1 Jan 2027$42Frontier AirlinesMcCarran International Airport (LAS) → Ontario International Airport (ONT)out nonstop, back nonstopfound 4 days agoSee prices for these dates
30 Dec – 31 Dec$43Frontier AirlinesMcCarran International Airport (LAS) → Ontario International Airport (ONT)out nonstop, back nonstopfound 2 days agoSee prices for these dates

Which month looks cheapest?

December 2026 is the cheapest month — from $42.

November 2026From $435 departure dates25 Nov – 30 Nov · found 7 days agoSee prices for these datesEvery date in November 2026
December 2026From $42Cheapest seen3 departure dates25 Dec – 1 Jan 2027 · found 4 days agoSee prices for these dates

One-way

In December 2026, the cheapest one-way fare on each of 7 departure dates is usually $22 to $29. Across all 22 departure dates we hold on this route, it is usually $29 to $69. Of the 3 months with enough one-way fares to compare, December 2026 is usually the cheapest.

Cheapest one-way found recently

$23

31 Dec · Frontier Airlines

McCarran International Airport (LAS) → Ontario International Airport (ONT)

nonstop

found yesterday

Open this tripCheck today's price

Cheapest we hold, of any age

$18

1 Dec · Frontier Airlines

McCarran International Airport (LAS) → Ontario International Airport (ONT)

nonstop

found 3 days ago

Open this tripCheck today's price

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The cheapest dates in December 2026

DatesFromAirlineStopsFound
1 Dec$18Frontier Airlinesnonstopfound 3 days agoOpen this trip
29 Dec$21Frontier Airlinesstops unknownfound 2 days agoOpen this trip
31 Dec$23Frontier Airlinesnonstopfound yesterdayOpen this trip
3 Dec$24Frontier Airlinesnonstopfound 2 days agoOpen this trip
4 Dec$29Frontier Airlinesnonstopfound 2 days agoOpen this trip

Every date we hold

7 departure dates

1 Dec: $18, found 3 days ago3 Dec: $24, found 2 days ago4 Dec: $29, found 2 days ago18 Dec: $29, found 4 days ago25 Dec: $29, found 2 days ago29 Dec: $21, found 2 days ago31 Dec: $23, found yesterdayDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
1 Dec$18Frontier AirlinesMcCarran International Airport (LAS) → Ontario International Airport (ONT)nonstopfound 3 days agoOpen this trip
3 Dec$24Frontier AirlinesMcCarran International Airport (LAS) → Ontario International Airport (ONT)nonstopfound 2 days agoOpen this trip
4 Dec$29Frontier AirlinesMcCarran International Airport (LAS) → Ontario International Airport (ONT)nonstopfound 2 days agoOpen this trip
18 Dec$29Frontier AirlinesMcCarran International Airport (LAS) → Ontario International Airport (ONT)nonstopfound 4 days agoOpen this trip
25 Dec$29Frontier AirlinesMcCarran International Airport (LAS) → Ontario International Airport (ONT)nonstopfound 2 days agoOpen this trip
29 Dec$21Frontier AirlinesMcCarran International Airport (LAS) → Ontario International Airport (ONT)stops unknownfound 2 days agoOpen this trip
31 Dec$23Frontier AirlinesMcCarran International Airport (LAS) → Ontario International Airport (ONT)nonstopfound yesterdayOpen this trip

Which month looks cheapest?

December 2026 is the cheapest month — from $18.

November 2026From $389 departure dates24 Nov · found 2 days agoOpen this tripEvery date in November 2026
December 2026From $18Cheapest seen7 departure dates1 Dec · found 3 days agoOpen this trip
January 2027From $192 departure dates6 Jan 2027 · found 2 days agoOpen this trip
March 2027From $694 departure dates12 Mar 2027 · found 5 days agoOpen this trip

Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work