United Flight AA399 Deals & Information (2025/2026)

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United Flight 399 Route Deals From $71

The cheapest prices found with in the last 7 days for return flights were $137 and $71 for one-way flights to Logan Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Oct 2 - Tue, Oct 7
ORD
O'Hare Intl.
BOS
Logan Intl.
$137 Roundtrip, found 1 hour ago
$137
Roundtrip
found 1 hour ago
Select United flight, departing Thu, Oct 2 from O'Hare Intl. to Logan Intl., returning Tue, Oct 7, priced at $137 found 1 hour ago
Fri, Oct 3 - Wed, Oct 8
ORD
O'Hare Intl.
BOS
Logan Intl.
$139 Roundtrip, found 1 hour ago
$139
Roundtrip
found 1 hour ago
Select United flight, departing Fri, Oct 3 from O'Hare Intl. to Logan Intl., returning Wed, Oct 8, priced at $139 found 1 hour ago
Fri, Sep 12 - Mon, Sep 15
ORD
O'Hare Intl.
BOS
Logan Intl.
$150 Roundtrip, found 2 hours ago
$150
Roundtrip
found 2 hours ago
Select United flight, departing Fri, Sep 12 from O'Hare Intl. to Logan Intl., returning Mon, Sep 15, priced at $150 found 2 hours ago
Wed, Jul 23 - Sun, Jul 27
ORD
O'Hare Intl.
BOS
Logan Intl.
$153 Roundtrip, found 2 hours ago
$153
Roundtrip
found 2 hours ago
Select United flight, departing Wed, Jul 23 from O'Hare Intl. to Logan Intl., returning Sun, Jul 27, priced at $153 found 2 hours ago
Fri, Oct 24 - Fri, Oct 31
ORD
O'Hare Intl.
BOS
Logan Intl.
$155 Roundtrip, found 5 hours ago
$155
Roundtrip
found 5 hours ago
Select United flight, departing Fri, Oct 24 from O'Hare Intl. to Logan Intl., returning Fri, Oct 31, priced at $155 found 5 hours ago
Fri, Oct 3 - Wed, Oct 8
ORD
O'Hare Intl.
BOS
Logan Intl.
$158 Roundtrip, found 1 hour ago
$158
Roundtrip
found 1 hour ago
Select United flight, departing Fri, Oct 3 from O'Hare Intl. to Logan Intl., returning Wed, Oct 8, priced at $158 found 1 hour ago
Thu, Aug 7 - Mon, Aug 11
ORD
O'Hare Intl.
BOS
Logan Intl.
$158 Roundtrip, found 1 hour ago
$158
Roundtrip
found 1 hour ago
Select United flight, departing Thu, Aug 7 from O'Hare Intl. to Logan Intl., returning Mon, Aug 11, priced at $158 found 1 hour ago
Fri, Oct 24 - Fri, Oct 31
ORD
O'Hare Intl.
BOS
Logan Intl.
$165 Roundtrip, found 5 hours ago
$165
Roundtrip
found 5 hours ago
Select United flight, departing Fri, Oct 24 from O'Hare Intl. to Logan Intl., returning Fri, Oct 31, priced at $165 found 5 hours ago
Sun, Aug 31 - Tue, Sep 2
ORD
O'Hare Intl.
BOS
Logan Intl.
$168 Roundtrip, found 17 hours ago
$168
Roundtrip
found 17 hours ago
Select United flight, departing Sun, Aug 31 from O'Hare Intl. to Logan Intl., returning Tue, Sep 2, priced at $168 found 17 hours ago

Frequently asked questions

What route does flight number UA399 take?
UA399 flies direct between George Bush Intercontinental Airport (IAH) and Tampa Airport in around 2 hours and 8 minutes. It can take other routes though, some of which may be multi-stop flights. Keep this in mind when locking in your seat to avoid any confusion.
What terminal does UA399 fly out of?
If you're leaving from Houston Airport, you'll probably board the plane from Terminal C. The most frequented route for UA399 is Houston Airport to Tampa Intl. Airport (TPA), which is a direct flight.
What kind of plane is on flight number UA399?
If you're booked on flight UA399 from Houston Airport to Tampa Airport, there's every chance you'll be aboard the Boeing 737-900. Flight UA399 serves numerous routes, but this is the most popular one.
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 UA399 flight with Travelocity, please visit our Customer Service Portal.