United Flight 400 Deals & Information (2026/2027)

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United Flight 400 Route Deals From $116

The cheapest prices found with in the last 7 days for return flights were $212 and $116 for one-way flights to Newark Liberty Intl. Airport for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Sep 10 - Sun, Sep 13
RSW
Southwest Florida Intl.
EWR
Newark Liberty Intl. Airport
$212 Roundtrip, found 5 days ago
$212
Roundtrip
found 5 days ago
Select United flight, departing Thu, Sep 10 from Southwest Florida Intl. to Newark Liberty Intl. Airport, returning Sun, Sep 13, priced at $212 found 5 days ago
Thu, Jul 2 - Mon, Jul 6
RSW
Southwest Florida Intl.
EWR
Newark Liberty Intl. Airport
$223 Roundtrip, found 6 hours ago
$223
Roundtrip
found 6 hours ago
Select United flight, departing Thu, Jul 2 from Southwest Florida Intl. to Newark Liberty Intl. Airport, returning Mon, Jul 6, priced at $223 found 6 hours ago
Wed, Jul 22 - Wed, Jul 29
RSW
Southwest Florida Intl.
EWR
Newark Liberty Intl. Airport
$227 Roundtrip, found 5 hours ago
$227
Roundtrip
found 5 hours ago
Select United flight, departing Wed, Jul 22 from Southwest Florida Intl. to Newark Liberty Intl. Airport, returning Wed, Jul 29, priced at $227 found 5 hours ago
Wed, Jun 3 - Wed, Jun 10
RSW
Southwest Florida Intl.
EWR
Newark Liberty Intl. Airport
$236 Roundtrip, found 5 hours ago
$236
Roundtrip
found 5 hours ago
Select United flight, departing Wed, Jun 3 from Southwest Florida Intl. to Newark Liberty Intl. Airport, returning Wed, Jun 10, priced at $236 found 5 hours ago
Wed, Jul 22 - Wed, Jul 29
RSW
Southwest Florida Intl.
EWR
Newark Liberty Intl. Airport
$237 Roundtrip, found 5 hours ago
$237
Roundtrip
found 5 hours ago
Select United flight, departing Wed, Jul 22 from Southwest Florida Intl. to Newark Liberty Intl. Airport, returning Wed, Jul 29, priced at $237 found 5 hours ago
Wed, Jul 22 - Thu, Jul 23
RSW
Southwest Florida Intl.
EWR
Newark Liberty Intl. Airport
$237 Roundtrip, found 9 hours ago
$237
Roundtrip
found 9 hours ago
Select United flight, departing Wed, Jul 22 from Southwest Florida Intl. to Newark Liberty Intl. Airport, returning Thu, Jul 23, priced at $237 found 9 hours ago
Fri, May 1 - Wed, May 6
RSW
Southwest Florida Intl.
EWR
Newark Liberty Intl. Airport
$241 Roundtrip, found 8 hours ago
$241
Roundtrip
found 8 hours ago
Select United flight, departing Fri, May 1 from Southwest Florida Intl. to Newark Liberty Intl. Airport, returning Wed, May 6, priced at $241 found 8 hours ago
Wed, Jun 3 - Wed, Jun 10
RSW
Southwest Florida Intl.
EWR
Newark Liberty Intl. Airport
$246 Roundtrip, found 5 hours ago
$246
Roundtrip
found 5 hours ago
Select United flight, departing Wed, Jun 3 from Southwest Florida Intl. to Newark Liberty Intl. Airport, returning Wed, Jun 10, priced at $246 found 5 hours ago
Sat, Jul 18 - Thu, Jul 30
RSW
Southwest Florida Intl.
EWR
Newark Liberty Intl. Airport
$257 Roundtrip, just found
$257
Roundtrip
just found
Select United flight, departing Sat, Jul 18 from Southwest Florida Intl. to Newark Liberty Intl. Airport, returning Thu, Jul 30, priced at $257 just found

Frequently asked questions

What route does flight number UA400 take?
UA400 operates from Dulles Intl. Airport to Raleigh–Durham Airport and is a direct flight. This trip takes 1 hour and 11 minutes.
What kind of plane is on flight number UA400?
The route for flight number UA400 is generally Dulles Intl. Airport to RDU, and the Boeing 737-800 is the aircraft model you'll probably 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 UA400 flight with Travelocity, please visit our Customer Service Portal.