Delta Flight NH166 Deals & Information (2025/2026)

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Delta Flight 166 Route Deals From $609

The cheapest prices found with in the last 7 days for return flights were $887 and $609 for one-way flights to Seattle - Tacoma Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Aug 27 - Sun, Sep 14
HND
Haneda
SEA
Seattle - Tacoma Intl.
$887 Roundtrip, found 3 days ago
$887
Roundtrip
found 3 days ago
Select Delta flight, departing Wed, Aug 27 from Haneda to Seattle - Tacoma Intl., returning Sun, Sep 14, priced at $887 found 3 days ago
Wed, Aug 27 - Sat, Sep 13
HND
Haneda
SEA
Seattle - Tacoma Intl.
$1,035 Roundtrip, found 3 days ago
$1,035
Roundtrip
found 3 days ago
Select Delta flight, departing Wed, Aug 27 from Haneda to Seattle - Tacoma Intl., returning Sat, Sep 13, priced at $1,035 found 3 days ago

Frequently asked questions

What route does flight number DL166 take?
Flight number DL166 operates direct from HND to Sea-Tac Airport. During this trip, expect to be in the air for 9 hours and 3 minutes. It pays to book ahead to lock in your favorite seat.
How often is DL166 on time?
Around 90% of DL166 flights arrive as scheduled — so if you’re jetting from Tokyo Airport (HND-Haneda) to SEA, you can kick back knowing that you’ll make it to your destination ASAP. If this Delta journey encounters a delay, you can expect to wait roughly 17 minutes. Thanks to the airline’s exceptional service, this route has a 4.1-star rating.
What terminal does DL166 fly out of?
You’ll likely be taking off from Terminal 3 if you’re booked on flight number DL166 direct from Haneda Airport (HND) to SEA.
What kind of plane is on flight number DL166?
The route for DL166 is predominantly Tokyo Haneda Airport to Seattle, WA Airport (SEA-Seattle - Tacoma Intl.), and the Airbus A330-900neo is the aircraft model you’re likely to be flying with.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your DL166 flight with Travelocity, please visit our Customer Service Portal.