Delta Flight 400 Deals & Information (2025/2026)

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Delta Flight 400 Route Deals From $137

The cheapest prices found with in the last 7 days for return flights were $237 and $137 for one-way flights to Logan Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Oct 7 - Wed, Oct 15
SFO
San Francisco Intl.
BOS
Logan Intl.
$237 Roundtrip, found 3 days ago
$237
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Oct 7 from San Francisco Intl. to Logan Intl., returning Wed, Oct 15, priced at $237 found 3 days ago
Sat, Sep 20 - Wed, Sep 24
SFO
San Francisco Intl.
BOS
Logan Intl.
$251 Roundtrip, found 6 hours ago
$251
Roundtrip
found 6 hours ago
Select Delta flight, departing Sat, Sep 20 from San Francisco Intl. to Logan Intl., returning Wed, Sep 24, priced at $251 found 6 hours ago

Frequently asked questions

What route does flight number DL400 take?
You'll be landing into Salt Lake City Intl. Airport from Louis Armstrong New Orleans Intl. Airport if you're traveling on flight number DL400. You'll be airborne for 3 hours and 42 minutes during this trip. It's also good to note that the flight conveniently travels non-stop.
What kind of plane is on flight number DL400?
The Airbus A320 is the type of plane that's generally used for flight DL400. More often than not, this flight jets off from Louis Armstrong New Orleans Intl. Airport and arrives at Salt Lake City Intl. Airport.
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 DL400 flight with Travelocity, please visit our Customer Service Portal.