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Seattle to New York in December 2026 BFI, SEA → EWR, JFK, LGA

Boeing Field International Airport (BFI), Seattle-Tacoma International Airport (SEA) → 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 $345 with Alaska Airlines, 8 Dec – 8 Dec, found 3 days ago. The cheapest one-way found recently is $172 with Alaska Airlines, 8 Dec, found today.

Return

In December 2026, the cheapest return fare on each of 9 departure dates is usually $363 to $521. Across all 15 departure dates we hold on this route, it is usually $358 to $480. Of the 2 months with enough return fares to compare, December 2026 is usually the most expensive.

Cheapest return found recently

$345

8 Dec – 8 Dec · Alaska Airlines

Seattle-Tacoma International Airport (SEA) → Newark Liberty International Airport (EWR)

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.

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The cheapest dates in December 2026

DatesFromAirlineStopsFound
8 Dec – 8 Dec$345Alaska Airlinesout nonstop, back nonstopfound 3 days agoSee prices for these dates
30 Dec – 8 Jan 2027$353United Airlinesout 1 stop, back nonstopfound 6 days agoSee prices for these dates
1 Dec – 8 Dec$363American Airlinesout 1 stop, back 1 stopfound 3 days agoSee prices for these dates
6 Dec – 8 Dec$366Alaska Airlinesout nonstop, back nonstopfound 3 days agoSee prices for these dates
10 Dec – 13 Dec$404Alaska Airlinesout nonstop, back nonstopfound 4 days agoSee prices for these dates

Every date we hold

9 departure dates

1 Dec – 8 Dec: $363, found 3 days ago6 Dec – 8 Dec: $366, found 3 days ago8 Dec – 8 Dec: $345, found 3 days ago10 Dec – 13 Dec: $404, found 4 days ago13 Dec – 17 Dec: $469, found 6 days ago17 Dec – 19 Dec: $531, found 5 days ago18 Dec – 19 Dec: $608, found 5 days ago23 Dec – 28 Dec: $521, found 5 days ago30 Dec – 8 Jan 2027: $353, found 6 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
1 Dec – 8 Dec$363American AirlinesSeattle-Tacoma International Airport (SEA) → Newark Liberty International Airport (EWR)out 1 stop, back 1 stopfound 3 days agoSee prices for these dates
6 Dec – 8 Dec$366Alaska AirlinesSeattle-Tacoma International Airport (SEA) → Newark Liberty International Airport (EWR)out nonstop, back nonstopfound 3 days agoSee prices for these dates
8 Dec – 8 Dec$345Alaska AirlinesSeattle-Tacoma International Airport (SEA) → Newark Liberty International Airport (EWR)out nonstop, back nonstopfound 3 days agoSee prices for these dates
10 Dec – 13 Dec$404Alaska AirlinesSeattle-Tacoma International Airport (SEA) → Newark Liberty International Airport (EWR)out nonstop, back nonstopfound 4 days agoSee prices for these dates
13 Dec – 17 Dec$469Alaska AirlinesSeattle-Tacoma International Airport (SEA) → Newark Liberty International Airport (EWR)out nonstop, back 1 stopfound 6 days agoSee prices for these dates
17 Dec – 19 Dec$531Alaska AirlinesSeattle-Tacoma International Airport (SEA) → Newark Liberty International Airport (EWR)out nonstop, back nonstopfound 5 days agoSee prices for these dates
18 Dec – 19 Dec$608Alaska AirlinesSeattle-Tacoma International Airport (SEA) → John F. Kennedy International Airport (JFK)out nonstop, back nonstopfound 5 days agoSee prices for these dates
23 Dec – 28 Dec$521United AirlinesSeattle-Tacoma International Airport (SEA) → Newark Liberty International Airport (EWR)out 1 stop, back nonstopfound 5 days agoSee prices for these dates
30 Dec – 8 Jan 2027$353United AirlinesSeattle-Tacoma International Airport (SEA) → Newark Liberty International Airport (EWR)out 1 stop, back nonstopfound 6 days agoSee prices for these dates

Which month looks cheapest?

October 2026 is the cheapest month — from $286.

October 2026From $286Cheapest seen4 departure dates25 Oct – 31 Oct · found 3 days agoSee prices for these dates
November 2026From $3622 departure dates4 Nov – 14 Nov · found 6 days agoSee prices for these dates
December 2026From $3459 departure dates8 Dec – 8 Dec · found 3 days agoSee prices for these dates

One-way

In December 2026, the cheapest one-way fare on each of 4 departure dates is usually $171 to $178. Across all 10 departure dates we hold on this route, it is usually $173 to $181. Of the 2 months with enough one-way fares to compare, December 2026 is usually the cheapest.

Cheapest one-way found recently

$172

8 Dec · Alaska Airlines

Seattle-Tacoma International Airport (SEA) → Newark Liberty International Airport (EWR)

nonstop

found today

Open this tripCheck today's price

Cheapest we hold, of any age

$169

9 Dec · United Airlines

Seattle-Tacoma International Airport (SEA) → Newark Liberty International Airport (EWR)

nonstop

found 6 days ago

Open this tripCheck today's price

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The cheapest dates in December 2026

DatesFromAirlineStopsFound
9 Dec$169United Airlinesnonstopfound 6 days agoOpen this trip
8 Dec$172Alaska Airlinesnonstopfound todayOpen this trip
5 Dec$173Alaska Airlinesnonstopfound 4 days agoOpen this trip
31 Dec$194United Airlinesnonstopfound 3 days agoOpen this trip

Every date we hold

4 departure dates

5 Dec: $173, found 4 days ago8 Dec: $172, found today9 Dec: $169, found 6 days ago31 Dec: $194, found 3 days agoDec
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
5 Dec$173Alaska AirlinesSeattle-Tacoma International Airport (SEA) → Newark Liberty International Airport (EWR)nonstopfound 4 days agoOpen this trip
8 Dec$172Alaska AirlinesSeattle-Tacoma International Airport (SEA) → Newark Liberty International Airport (EWR)nonstopfound todayOpen this trip
9 Dec$169United AirlinesSeattle-Tacoma International Airport (SEA) → Newark Liberty International Airport (EWR)nonstopfound 6 days agoOpen this trip
31 Dec$194United AirlinesSeattle-Tacoma International Airport (SEA) → Newark Liberty International Airport (EWR)nonstopfound 3 days agoOpen this trip

Which month looks cheapest?

December 2026 is the cheapest month — from $169.

October 2026From $1741 departure date26 Oct · found 6 days agoOpen this trip
November 2026From $1743 departure dates17 Nov · found 5 days agoOpen this trip
December 2026From $169Cheapest seen4 departure dates9 Dec · found 6 days agoOpen this trip
January 2027From $1791 departure date12 Jan 2027 · found 5 days agoOpen this trip
March 2027From $1791 departure date2 Mar 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