Delta Flight 400 Deals & Information (2026/2027)

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Delta Flight 400 Route Deals From $107

The cheapest prices found with in the last 7 days for return flights were $207 and $107 for one-way flights to Logan Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sun, Jan 25 - Wed, Feb 4
SFO
San Francisco Intl.
BOS
Logan Intl.
$207 Roundtrip, found 18 hours ago
$207
Roundtrip
found 18 hours ago
Select Delta flight, departing Sun, Jan 25 from San Francisco Intl. to Logan Intl., returning Wed, Feb 4, priced at $207 found 18 hours ago
Tue, Jan 27 - Wed, Jan 28
SFO
San Francisco Intl.
BOS
Logan Intl.
$213 Roundtrip, just found
$213
Roundtrip
just found
Select Delta flight, departing Tue, Jan 27 from San Francisco Intl. to Logan Intl., returning Wed, Jan 28, priced at $213 just found
Tue, Jan 27 - Fri, Feb 27
SFO
San Francisco Intl.
BOS
Logan Intl.
$233 Roundtrip, found 2 days ago
$233
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Jan 27 from San Francisco Intl. to Logan Intl., returning Fri, Feb 27, priced at $233 found 2 days ago
Tue, Jan 27 - Sat, Jan 31
SFO
San Francisco Intl.
BOS
Logan Intl.
$234 Roundtrip, found 6 days ago
$234
Roundtrip
found 6 days ago
Select Delta flight, departing Tue, Jan 27 from San Francisco Intl. to Logan Intl., returning Sat, Jan 31, priced at $234 found 6 days ago
Tue, Feb 3 - Tue, Feb 24
SFO
San Francisco Intl.
BOS
Logan Intl.
$241 Roundtrip, found 4 hours ago
$241
Roundtrip
found 4 hours ago
Select Delta flight, departing Tue, Feb 3 from San Francisco Intl. to Logan Intl., returning Tue, Feb 24, priced at $241 found 4 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.