Delta Flight 166 Deals & Information (2025/2026)

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Delta Flight 166 Route Deals From $528

The cheapest prices found with in the last 7 days for return flights were $603 and $528 for one-way flights to Seattle - Tacoma Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Jan 27 - Thu, Feb 5
HND
Haneda
SEA
Seattle - Tacoma Intl.
$603 Roundtrip, found 1 day ago
$603
Roundtrip
found 1 day ago
Select Delta flight, departing Tue, Jan 27 from Haneda to Seattle - Tacoma Intl., returning Thu, Feb 5, priced at $603 found 1 day ago
Thu, Jan 29 - Wed, Feb 4
HND
Haneda
SEA
Seattle - Tacoma Intl.
$616 Roundtrip, found 1 day ago
$616
Roundtrip
found 1 day ago
Select Delta flight, departing Thu, Jan 29 from Haneda to Seattle - Tacoma Intl., returning Wed, Feb 4, priced at $616 found 1 day ago
Fri, Dec 26 - Sun, Jan 11
HND
Haneda
SEA
Seattle - Tacoma Intl.
$651 Roundtrip, found 4 days ago
$651
Roundtrip
found 4 days ago
Select Delta flight, departing Fri, Dec 26 from Haneda to Seattle - Tacoma Intl., returning Sun, Jan 11, priced at $651 found 4 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.