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Ontario to New York flights in December 2026 from $173 ONT → EWR, JFK, LGA

Ontario International Airport (ONT) → Newark Liberty International Airport (EWR), John F. Kennedy International Airport (JFK), LaGuardia Airport (LGA)

For departures in December 2026, the cheapest return found recently is $449 with Southwest Airlines, 20 Dec – 30 Dec, found yesterday. The cheapest one-way found recently is $173 with Southwest Airlines, 21 Dec, found 4 days ago.

Return

In December 2026, the cheapest return fare on each of 20 departure dates is usually $414 to $540. Across all 47 departure dates we hold on this route, it is usually $367 to $528. Of the 5 months with enough return fares to compare, 3 are usually cheaper than December 2026.

Cheapest return found recently

$449

20 Dec – 30 Dec · Southwest Airlines

Ontario International Airport (ONT) → LaGuardia Airport (LGA)

out 1 stop, back 1 stop

found yesterday

See prices for these datesCheck today's price

Cheapest we hold, of any age

$327

6 Dec – 9 Dec · Southwest Airlines

Ontario International Airport (ONT) → LaGuardia Airport (LGA)

out 1 stop, back 1 stop

found 7 days ago

See prices for these datesCheck today's price

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The cheapest dates in December 2026

DatesFromAirlineStopsFound
6 Dec – 9 Dec$327Southwest Airlinesout 1 stop, back 1 stopfound 7 days agoSee prices for these dates
13 Dec – 15 Dec$336Southwest Airlinesout 1 stop, back 1 stopfound 2 days agoSee prices for these dates
7 Dec – 14 Dec$346Alaska Airlinesout 1 stop, back nonstopfound 6 days agoSee prices for these dates
9 Dec – 12 Dec$364American Airlinesout 1 stop, back nonstopfound 7 days agoSee prices for these dates
2 Dec – 11 Dec$392Frontier Airlinesout 2 stops, back 1 stopfound 2 days agoSee prices for these dates

Every date we hold

20 departure dates

2 Dec – 11 Dec: $392, found 2 days ago6 Dec – 9 Dec: $327, found 7 days ago7 Dec – 14 Dec: $346, found 6 days ago9 Dec – 12 Dec: $364, found 7 days ago13 Dec – 15 Dec: $336, found 2 days ago14 Dec – 18 Dec: $580, found 2 days ago15 Dec – 2 Jan 2027: $523, found 6 days ago16 Dec – 19 Dec: $456, found 7 days ago17 Dec – 20 Dec: $535, found 7 days ago20 Dec – 30 Dec: $449, found yesterday21 Dec – 27 Dec: $555, found 6 days ago22 Dec – 1 Jan 2027: $429, found 7 days ago23 Dec – 15 Jan 2027: $422, found 4 days ago24 Dec – 1 Jan 2027: $482, found 7 days ago25 Dec – 31 Dec: $493, found 7 days ago26 Dec – 29 Dec: $673, found 7 days ago27 Dec – 4 Jan 2027: $798, found 4 days ago28 Dec – 5 Jan 2027: $509, found 4 days ago29 Dec – 7 Jan 2027: $553, found 4 days ago30 Dec – 9 Jan 2027: $491, found 6 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
2 Dec – 11 Dec$392Frontier AirlinesOntario International Airport (ONT) → Newark Liberty International Airport (EWR)out 2 stops, back 1 stopfound 2 days agoSee prices for these dates
6 Dec – 9 Dec$327Southwest AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)out 1 stop, back 1 stopfound 7 days agoSee prices for these dates
7 Dec – 14 Dec$346Alaska AirlinesOntario International Airport (ONT) → John F. Kennedy International Airport (JFK)out 1 stop, back nonstopfound 6 days agoSee prices for these dates
9 Dec – 12 Dec$364American AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)out 1 stop, back nonstopfound 7 days agoSee prices for these dates
13 Dec – 15 Dec$336Southwest AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)out 1 stop, back 1 stopfound 2 days agoSee prices for these dates
14 Dec – 18 Dec$580Southwest AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)out 1 stop, back 1 stopfound 2 days agoSee prices for these dates
15 Dec – 2 Jan 2027$523Southwest AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)out 1 stop, back 1 stopfound 6 days agoSee prices for these dates
16 Dec – 19 Dec$456Frontier AirlinesOntario International Airport (ONT) → Newark Liberty International Airport (EWR)out 3 stops, back 1 stopfound 7 days agoSee prices for these dates
17 Dec – 20 Dec$535United AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)out nonstop, back 1 stopfound 7 days agoSee prices for these dates
20 Dec – 30 Dec$449Southwest AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)out 1 stop, back 1 stopfound yesterdaySee prices for these dates
21 Dec – 27 Dec$555Southwest AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)out 1 stop, back 1 stopfound 6 days agoSee prices for these dates
22 Dec – 1 Jan 2027$429American AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)out 1 stop, back nonstopfound 7 days agoSee prices for these dates
23 Dec – 15 Jan 2027$422United AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)out 1 stop, back 1 stopfound 4 days agoSee prices for these dates
24 Dec – 1 Jan 2027$482Southwest AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)out 1 stop, back nonstopfound 7 days agoSee prices for these dates
25 Dec – 31 Dec$493American AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)out 1 stop, back 1 stopfound 7 days agoSee prices for these dates
26 Dec – 29 Dec$673American AirlinesOntario International Airport (ONT) → Newark Liberty International Airport (EWR)out 1 stop, back nonstopfound 7 days agoSee prices for these dates
27 Dec – 4 Jan 2027$798United AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)out nonstop, back nonstopfound 4 days agoSee prices for these dates
28 Dec – 5 Jan 2027$509American AirlinesOntario International Airport (ONT) → John F. Kennedy International Airport (JFK)out 1 stop, back 1 stopfound 4 days agoSee prices for these dates
29 Dec – 7 Jan 2027$553Frontier AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)out 2 stops, back 1 stopfound 4 days agoSee prices for these dates
30 Dec – 9 Jan 2027$491Southwest AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)out 1 stop, back 1 stopfound 6 days agoSee prices for these dates

Which month looks cheapest?

December 2026 is the cheapest month — from $327.

November 2026From $3947 departure dates26 Nov – 6 Dec · found 8 days agoSee prices for these datesEvery date in November 2026
December 2026From $327Cheapest seen20 departure dates6 Dec – 9 Dec · found 7 days agoSee prices for these dates
January 2027From $32810 departure dates7 Jan 2027 – 11 Jan 2027 · found 7 days agoSee prices for these datesEvery date in January 2027
February 2027From $3553 departure dates1 Feb 2027 – 4 Feb 2027 · found 2 days agoSee prices for these dates
March 2027From $5144 departure dates20 Mar 2027 – 23 Mar 2027 · found 6 days agoSee prices for these dates
April 2027From $5171 departure date8 Apr 2027 – 10 Apr 2027 · found 5 days agoSee prices for these dates
June 2027From $5411 departure date6 Jun 2027 – 11 Jun 2027 · found 6 days agoSee prices for these dates
August 2027From $5321 departure date8 Aug 2027 – 15 Aug 2027 · found 7 days agoSee prices for these dates

One-way

We hold one-way fares on only 2 departure dates in December 2026, too few to say what one usually costs.

Cheapest one-way found recently

$173

21 Dec · Southwest Airlines

Ontario International Airport (ONT) → LaGuardia Airport (LGA)

1 stop

found 4 days ago

Open this tripCheck today's price

It is also the cheapest one-way we hold, of any age.

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The cheapest dates in December 2026

DatesFromAirlineStopsFound
21 Dec$173Southwest Airlines1 stopfound 4 days agoOpen this trip
17 Dec$195American Airlines1 stopfound 6 days agoOpen this trip

Every date we hold

2 departure dates

17 Dec: $195, found 6 days ago21 Dec: $173, found 4 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
17 Dec$195American AirlinesOntario International Airport (ONT) → John F. Kennedy International Airport (JFK)1 stopfound 6 days agoOpen this trip
21 Dec$173Southwest AirlinesOntario International Airport (ONT) → LaGuardia Airport (LGA)1 stopfound 4 days agoOpen this trip

Which month looks cheapest?

February 2027 is the cheapest month — from $117.

November 2026From $2071 departure date13 Nov · found 7 days agoOpen this tripEvery date in November 2026
December 2026From $1732 departure dates21 Dec · found 4 days agoOpen this trip
January 2027From $17212 departure dates16 Jan 2027 · found 3 days agoOpen this tripEvery date in January 2027
February 2027From $117Cheapest seen2 departure dates1 Feb 2027 · found 6 days agoOpen this trip
March 2027From $1975 departure dates10 Mar 2027 · found 4 days agoOpen this trip
May 2027From $2066 departure dates5 May 2027 · found 6 days agoOpen this trip
June 2027From $3041 departure date6 Jun 2027 · found 4 days agoOpen this trip
July 2027From $2323 departure dates20 Jul 2027 · found 2 days agoOpen this trip
August 2027From $2961 departure date1 Aug 2027 · found 6 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