Skip to content
FareTell

Ontario to Las Vegas flights in December 2026 from $21 ONT → LAS

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

For departures in December 2026, the cheapest return found recently is $33 with Frontier Airlines, 5 Dec – 9 Dec, found 3 days ago. The cheapest one-way found recently is $21 with Frontier Airlines, 29 Dec, found 2 days ago.

Return

In December 2026, the cheapest return fare on each of 10 departure dates is usually $44 to $51. Across all 27 departure dates we hold on this route, it is usually $46 to $140. Of the 3 months with enough return fares to compare, 1 is usually cheaper than December 2026.

Cheapest return found recently

$33

5 Dec – 9 Dec · Frontier Airlines

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

out nonstop, back nonstop

found 3 days ago

See prices for these datesCheck today's price

It is also the cheapest return we hold, of any age.

FareTell may earn a commission when you book through a partner.

The cheapest dates in December 2026

DatesFromAirlineStopsFound
5 Dec – 9 Dec$33Frontier Airlinesout nonstop, back nonstopfound 3 days agoSee prices for these dates
15 Dec – 22 Dec$33Frontier Airlinesout nonstop, back nonstopfound 3 days agoSee prices for these dates
23 Dec – 25 Dec$43Frontier Airlinesout nonstop, back nonstopfound 3 days agoSee prices for these dates
6 Dec – 8 Dec$46Frontier Airlinesout nonstop, back nonstopfound 5 days agoSee prices for these dates
7 Dec – 8 Dec$46Frontier Airlinesout nonstop, back nonstopfound 5 days agoSee prices for these dates

Every date we hold

10 departure dates

4 Dec – 6 Dec: $97, found 7 days ago5 Dec – 9 Dec: $33, found 3 days ago6 Dec – 8 Dec: $46, found 5 days ago7 Dec – 8 Dec: $46, found 5 days ago14 Dec – 17 Dec: $47, found 6 days ago15 Dec – 22 Dec: $33, found 3 days ago18 Dec – 22 Dec: $50, found 7 days ago23 Dec – 25 Dec: $43, found 3 days ago25 Dec – 1 Jan 2027: $51, found 3 days ago30 Dec – 1 Jan 2027: $53, found 4 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$97Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)out nonstop, back nonstopfound 7 days agoSee prices for these dates
5 Dec – 9 Dec$33Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)out nonstop, back nonstopfound 3 days agoSee prices for these dates
6 Dec – 8 Dec$46Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)out nonstop, back nonstopfound 5 days agoSee prices for these dates
7 Dec – 8 Dec$46Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)out nonstop, back nonstopfound 5 days agoSee prices for these dates
14 Dec – 17 Dec$47Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)out nonstop, back nonstopfound 6 days agoSee prices for these dates
15 Dec – 22 Dec$33Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)out nonstop, back nonstopfound 3 days agoSee prices for these dates
18 Dec – 22 Dec$50Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)out nonstop, back nonstopfound 7 days agoSee prices for these dates
23 Dec – 25 Dec$43Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)out nonstop, back nonstopfound 3 days agoSee prices for these dates
25 Dec – 1 Jan 2027$51Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)out nonstop, back nonstopfound 3 days agoSee prices for these dates
30 Dec – 1 Jan 2027$53Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)out nonstop, back nonstopfound 4 days agoSee prices for these dates

Which month looks cheapest?

December 2026 is the cheapest month — from $33.

November 2026From $489 departure dates27 Nov – 30 Nov · found 7 days agoSee prices for these datesEvery date in November 2026
December 2026From $33Cheapest seen10 departure dates5 Dec – 9 Dec · found 3 days agoSee prices for these dates
January 2027From $355 departure dates16 Jan 2027 – 19 Jan 2027 · found 4 days agoSee prices for these dates
March 2027From $1302 departure dates17 Mar 2027 – 19 Mar 2027 · found 2 days agoSee prices for these dates
June 2027From $3561 departure date17 Jun 2027 – 24 Jun 2027 · found 8 days agoSee prices for these dates

One-way

In December 2026, the cheapest one-way fare on each of 13 departure dates is usually $21 to $29. Across all 34 departure dates we hold on this route, it is usually $23 to $118. Of the 3 months with enough one-way fares to compare, 1 is usually cheaper than December 2026.

Cheapest one-way found recently

$21

29 Dec · Frontier Airlines

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

nonstop

found 2 days ago

Open this tripCheck today's price

Cheapest we hold, of any age

$20

2 Dec · Frontier Airlines

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

nonstop

found 7 days ago

Open this tripCheck today's price

FareTell may earn a commission when you book through a partner.

The cheapest dates in December 2026

DatesFromAirlineStopsFound
2 Dec$20Frontier Airlinesnonstopfound 7 days agoOpen this trip
5 Dec$20Frontier Airlinesnonstopfound 6 days agoOpen this trip
8 Dec$21Frontier Airlinesnonstopfound 3 days agoOpen this trip
29 Dec$21Frontier Airlinesnonstopfound 2 days agoOpen this trip
30 Dec$21Frontier Airlinesnonstopfound 2 days agoOpen this trip

Every date we hold

13 departure dates

1 Dec: $56, found 3 days ago2 Dec: $20, found 7 days ago3 Dec: $25, found 2 days ago5 Dec: $20, found 6 days ago6 Dec: $29, found 7 days ago8 Dec: $21, found 3 days ago9 Dec: $22, found 6 days ago20 Dec: $29, found 2 days ago25 Dec: $23, found 3 days ago28 Dec: $136, found 2 days ago29 Dec: $21, found 2 days ago30 Dec: $21, found 2 days ago31 Dec: $24, found 2 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
1 Dec$56Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)nonstopfound 3 days agoOpen this trip
2 Dec$20Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)nonstopfound 7 days agoOpen this trip
3 Dec$25Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)nonstopfound 2 days agoOpen this trip
5 Dec$20Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)nonstopfound 6 days agoOpen this trip
6 Dec$29Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)nonstopfound 7 days agoOpen this trip
8 Dec$21Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)nonstopfound 3 days agoOpen this trip
9 Dec$22Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)nonstopfound 6 days agoOpen this trip
20 Dec$29Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)nonstopfound 2 days agoOpen this trip
25 Dec$23Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)nonstopfound 3 days agoOpen this trip
28 Dec$136Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)nonstopfound 2 days agoOpen this trip
29 Dec$21Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)nonstopfound 2 days agoOpen this trip
30 Dec$21Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)nonstopfound 2 days agoOpen this trip
31 Dec$24Frontier AirlinesOntario International Airport (ONT) → McCarran International Airport (LAS)nonstopfound 2 days agoOpen this trip

Which month looks cheapest?

December 2026 is the cheapest month — from $20.

November 2026From $2415 departure dates26 Nov · found 5 days agoOpen this tripEvery date in November 2026
December 2026From $20Cheapest seen13 departure dates2 Dec · found 7 days agoOpen this trip
January 2027From $213 departure dates5 Jan 2027 · found 4 days agoOpen this trip
May 2027From $1991 departure date18 May 2027 · found 4 days agoOpen this trip
July 2027From $2081 departure date19 Jul 2027 · found 4 days agoOpen this trip
September 2027From $2291 departure date14 Sept 2027 · found 4 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