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St Louis to New York in December 2026 STL → EWR, LGA

Lambert-St. Louis International Airport (STL) → Newark Liberty International Airport (EWR), LaGuardia Airport (LGA)

For departures in December 2026, the cheapest return found recently is $312 with Frontier Airlines, 10 Dec – 13 Dec, found 2 days ago. The cheapest one-way found recently is $140 with Frontier Airlines, 23 Dec, found 4 days ago.

Return

In December 2026, the cheapest return fare on each of 7 departure dates is usually $290 to $314. Across all 8 departure dates we hold on this route, it is usually $292 to $323.

Cheapest return found recently

$312

10 Dec – 13 Dec · Frontier Airlines

Lambert-St. Louis International Airport (STL) → LaGuardia Airport (LGA)

out 1 stop, back 1 stop

found 2 days ago

See prices for these datesCheck today's price

Cheapest we hold, of any age

$270

19 Dec – 15 Jan 2027 · Southwest Airlines

Lambert-St. Louis International Airport (STL) → LaGuardia Airport (LGA)

out nonstop, back nonstop

found 5 days ago

See prices for these datesCheck today's price

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The cheapest dates in December 2026

DatesFromAirlineStopsFound
19 Dec – 15 Jan 2027$270Southwest Airlinesout nonstop, back nonstopfound 5 days agoSee prices for these dates
18 Dec – 12 Jan 2027$285Southwest Airlinesout nonstop, back nonstopfound 5 days agoSee prices for these dates
12 Dec – 15 Jan 2027$294American Airlinesout 1 stop, back nonstopfound 6 days agoSee prices for these dates
20 Dec – 14 Jan 2027$297Frontier Airlinesout 1 stop, back 1 stopfound 4 days agoSee prices for these dates
10 Dec – 13 Dec$312Frontier Airlinesout 1 stop, back 1 stopfound 2 days agoSee prices for these dates

Every date we hold

7 departure dates

10 Dec – 13 Dec: $312, found 2 days ago12 Dec – 15 Jan 2027: $294, found 6 days ago18 Dec – 12 Jan 2027: $285, found 5 days ago19 Dec – 15 Jan 2027: $270, found 5 days ago20 Dec – 14 Jan 2027: $297, found 4 days ago21 Dec – 15 Jan 2027: $345, found 2 days ago22 Dec – 14 Jan 2027: $315, found 3 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
10 Dec – 13 Dec$312Frontier AirlinesLambert-St. Louis International Airport (STL) → LaGuardia Airport (LGA)out 1 stop, back 1 stopfound 2 days agoSee prices for these dates
12 Dec – 15 Jan 2027$294American AirlinesLambert-St. Louis International Airport (STL) → LaGuardia Airport (LGA)out 1 stop, back nonstopfound 6 days agoSee prices for these dates
18 Dec – 12 Jan 2027$285Southwest AirlinesLambert-St. Louis International Airport (STL) → LaGuardia Airport (LGA)out nonstop, back nonstopfound 5 days agoSee prices for these dates
19 Dec – 15 Jan 2027$270Southwest AirlinesLambert-St. Louis International Airport (STL) → LaGuardia Airport (LGA)out nonstop, back nonstopfound 5 days agoSee prices for these dates
20 Dec – 14 Jan 2027$297Frontier AirlinesLambert-St. Louis International Airport (STL) → LaGuardia Airport (LGA)out 1 stop, back 1 stopfound 4 days agoSee prices for these dates
21 Dec – 15 Jan 2027$345Southwest AirlinesLambert-St. Louis International Airport (STL) → LaGuardia Airport (LGA)out nonstop, back nonstopfound 2 days agoSee prices for these dates
22 Dec – 14 Jan 2027$315Southwest AirlinesLambert-St. Louis International Airport (STL) → LaGuardia Airport (LGA)out nonstop, back nonstopfound 3 days agoSee prices for these dates

Which month looks cheapest?

December 2026 is the cheapest month — from $270.

October 2026From $3741 departure date24 Oct – 26 Oct · found 6 days agoSee prices for these dates
December 2026From $270Cheapest seen7 departure dates19 Dec – 15 Jan 2027 · found 5 days agoSee prices for these dates

One-way

In December 2026, the cheapest one-way fare on each of 4 departure dates is usually $141 to $152. Across all 8 departure dates we hold on this route, it is usually $141 to $158. Of the 2 months with enough one-way fares to compare, December 2026 is usually the cheapest.

Cheapest one-way found recently

$140

23 Dec · Frontier Airlines

Lambert-St. Louis International Airport (STL) → Newark Liberty International Airport (EWR)

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
23 Dec$140Frontier Airlines1 stopfound 4 days agoOpen this trip
19 Dec$141Southwest Airlinesnonstopfound 5 days agoOpen this trip
18 Dec$143Frontier Airlines1 stopfound 5 days agoOpen this trip
20 Dec$180Southwest Airlinesnonstopfound 4 days agoOpen this trip

Every date we hold

4 departure dates

18 Dec: $143, found 5 days ago19 Dec: $141, found 5 days ago20 Dec: $180, found 4 days ago23 Dec: $140, found 4 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
18 Dec$143Frontier AirlinesLambert-St. Louis International Airport (STL) → Newark Liberty International Airport (EWR)1 stopfound 5 days agoOpen this trip
19 Dec$141Southwest AirlinesLambert-St. Louis International Airport (STL) → LaGuardia Airport (LGA)nonstopfound 5 days agoOpen this trip
20 Dec$180Southwest AirlinesLambert-St. Louis International Airport (STL) → LaGuardia Airport (LGA)nonstopfound 4 days agoOpen this trip
23 Dec$140Frontier AirlinesLambert-St. Louis International Airport (STL) → Newark Liberty International Airport (EWR)1 stopfound 4 days agoOpen this trip

Which month looks cheapest?

December 2026 is the cheapest month — from $140.

October 2026From $1771 departure date24 Oct · found 5 days agoOpen this trip
December 2026From $140Cheapest seen4 departure dates23 Dec · found 4 days agoOpen this trip
January 2027From $1413 departure dates15 Jan 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