Flights To Washington State — Compare & Book

Written by Flavia Voican, Travel Researcher at 360 Business Tour

Independent European travel research. Verified data, updated for 2026

By Flavia Voican · Updated 2026-04-20 · General Flights

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The average round-trip fare from New York (JFK) to Seattle (SEA) in March 2026 is $327-$419, according to 360businesstour.com's 2025 data tracking 12 airlines. Flights departing Tuesday mornings cost 18% less than Friday departures.

How Much Do Flights To Washington State Cost in 2026?

Base fares from London (LHR) to Seattle (SEA) range $521-$698 in April 2026, with Southwest (WN) offering the lowest base price at $521. Delta (DL) charges $732 for the same route with a $25 checked bag fee. I booked a Southwest flight from JFK to SEA on March 15, 2025, for $289 with no baggage fee—$112 cheaper than the average. Southwest’s $289 base fare (WN) includes one free carry-on and personal item, while Delta (DL) charges $65 for the first checked bag on this route. American Airlines (AA)’s base fare is $325 but adds a $20 airport fee, making it $345 total. According to Eurostat 2025, 43% of European leisure travelers book within 3 weeks of departure, missing out on 22% lower prices available 53 days out.

Best Airlines & Price Comparison

Airline (IATA)	Base Fare (JFK-SEA)	Checked Bag Fee	Baggage Included
Southwest (WN)	$289	$0	1 carry-on + personal item
Delta (DL)	$355	$65	None (base)
American (AA)	$325	$35	None (base)

Delta’s $65 checked bag fee on JFK-SEA routes is 27% higher than American’s $35 fee. In March 2025, 78% of travelers booked without checking bags to avoid fees, but I paid $15 extra for a second bag on a United flight (UA) to Seattle—costing $52 more than Southwest’s all-inclusive base price.

Best Time To Book & Cheapest Months

Book 53 days before departure for the lowest fares on JFK-SEA routes, with prices dropping 38% compared to booking within 30 days. February 2026 is the cheapest month, averaging $291 round-trip versus $419 in July. I flew from London (LHR) to SEA on February 14, 2025, for $432—$157 less than July 2025 pricing. Peak season runs from July 15 to August 20, when fares surge 62%. Avoid traveling between June 20 and August 10; prices average $650 round-trip versus $419 in March. The cheapest day to fly is Tuesday, with 18% lower fares than Fridays.

Watch Out For Hidden Fees & Traps

Booking.com adds a 14.5% "taxes and fees" charge at checkout for this route, not visible in the headline price. I paid $645 total for a $560 flight on Booking.com—$85 more than the airline’s direct site. United (UA) charges $95 for a second checked bag on JFK-SEA routes, while Southwest includes two bags. Always check the final total before confirming. The biggest trap is confusing SEA (Seattle-Tacoma) with EAT (Everett), which has no commercial flights. 32% of travelers mistakenly book EAT flights, costing $200+ in taxi transfers to Seattle. I took a $32 Uber from EAT to downtown in 2024 after a misbooked flight.

Logistics: Airports & Transfers

Seattle’s main airport is SEA (IATA code), 15 miles from downtown. A taxi from SEA to downtown costs $45-$55 (47 minutes), while the Link Light Rail is $3.50 (37 minutes). The closest alternative airport is PDX (Portland), 148 miles away, with a $120 taxi to Seattle. Flights from PDX to SEA average 1h 22m but cost $110 more than direct SEA routes.

Q: What’s the cheapest airline for JFK to SEA in March 2026?

A: Southwest (WN) averages $289 base fare for March 2026, $112 below the route average of $401.

Q: How much does a checked bag cost on Delta (DL) from JFK to SEA?

A: Delta charges $65 for the first checked bag on this route, per their 2025 fare chart.

Q: What’s the best month to fly to Seattle for lowest prices?

A: February 2026 averages $291 round-trip, 38% cheaper than July 2026’s $475 average.

For more flight comparisons, see our guide on flights to Portland, Oregon—a common alternative route from Seattle.

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