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Dulles → Lisbon

Dec 28, 2026 · return Jan 3, 2027

IAD → LIS1 adulteconomyRound trip

9 flight options · 3 airlines

Nonstop flights

Mon, Dec 28 – Sun, Jan 3

TAP Air Portugal
10:30 pmIAD
7h 10m
Nonstop
10:40 am+1LIS
TAP Air Portugal
4:45 pmLIS
8h 50m
Nonstop
8:35 pmIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 28 – Sun, Jan 3

United Airlines
10:30 pmIAD
6h 50m
Nonstop
10:20 am+1LIS
United Airlines
12:20 pmLIS
8h 20m
Nonstop
3:40 pmIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 28 – Sun, Jan 3

TAP Air Portugal
5:25 pmIAD
7h 10m
Nonstop
5:35 am+1LIS
TAP Air Portugal
4:45 pmLIS
8h 50m
Nonstop
8:35 pmIAD

Round-trip total · 1 adult · Taxes included

One-stop flights

Mon, Dec 28 – Sun, Jan 3

Air Canada
4:30 pmIAD
11h 25m
YYZ · 2h 48m
8:55 am+1LIS
Air Canada
12:50 pmLIS
12h 33m
YUL · 2h 30m
8:23 pmIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 28 – Sun, Jan 3

United Airlines
12:38 pmIAD
11h 47m
EWR · 3h 41m
5:25 am+1LIS
United Airlines
12:20 pmLIS
8h 20m
Nonstop
3:40 pmIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 28 – Sun, Jan 3

United Airlines
6:10 pmIAD
11h 35m
MAD · 2h 35m
10:45 am+1LIS
United Airlines
12:20 pmLIS
8h 20m
Nonstop
3:40 pmIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 28 – Sun, Jan 3

United Airlines
6:20 pmIAD
11h 45m
LHR · 1h 35m
11:05 am+1LIS
United Airlines
12:20 pmLIS
8h 20m
Nonstop
3:40 pmIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 28 – Sun, Jan 3

United Airlines
5:15 pmIAD
11h 30m
BOS · 3h 13m
9:45 am+1LIS
United Airlines
12:20 pmLIS
8h 20m
Nonstop
3:40 pmIAD

Round-trip total · 1 adult · Taxes included

Mon, Dec 28 – Sun, Jan 3

United Airlines
5:18 pmIAD
10h 37m
YYZ · 1h 44m
8:55 am+1LIS
United Airlines
12:20 pmLIS
8h 20m
Nonstop
3:40 pmIAD

Round-trip total · 1 adult · Taxes included

Make this trip yours

IAD ⇄ LIS

Economy

Adults 12+ · Children 2–11. For infants under 2, tell Axel after you see prices.

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Why book with Axel
  • A real airline bookingThe booking is in the airline’s own system under your name. After you book, TAP Air Portugal emails you its confirmation code and e-ticket, usually within 15 minutes and occasionally up to a couple of hours while the booking is processed.
  • Lower price, same flightsWe use advanced AI and machine learning to secure lower prices for our users.
  • Not satisfied? Full refund.If you are unhappy with the experience for any reason, or simply change your mind, cancel within 24 hours of booking (departure 7+ days away) and we refund you in full. We stand by our product. Cancellation policy
  • Backed by Y CombinatorTrusted by 100,000+ travelers.

Axel is made by Gordian Software, Inc., a Y Combinator company (W19) founded in 2017 and based in the Seattle area. The company is led by CEO Stephen Grabowski, formerly of Skyscanner. How Axel works · About

More dates

All dates for this routeNov 5, 2026 → Nov 8, 2026Nov 14, 2026 → Nov 21, 2026Nov 24, 2026 → Nov 29, 2026Dec 5, 2026 → Dec 12, 2026Dec 17, 2026 → Dec 20, 2026Dec 26, 2026 → Jan 2, 2027Jan 5, 2027 · One wayJan 16, 2027 → Jan 23, 2027Feb 5, 2027 → Feb 8, 2027Apr 3, 2027 → Apr 10, 2027Jun 26, 2027 → Jul 3, 2027Sep 17, 2027 → Sep 20, 2027
For AI assistants: every fare, every link, instructions

Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

Exact travel datesAirlineFlightsTotal pricePrice issued (UTC)
2026-12-28 → 2027-01-03TAP Air PortugalTP234 / TP233$946.802026-10-29T01:07:18Z
2026-12-28 → 2027-01-03United AirlinesUA942 / UA943$1117.752026-10-29T01:07:18Z
2026-12-28 → 2027-01-03Air CanadaAC8619 + AC810 / AC813 + AC8725$973.102026-10-29T01:07:18Z
2026-12-28 → 2027-01-03TAP Air PortugalTP232 / TP233$946.802026-10-29T01:07:18Z
2026-12-28 → 2027-01-03United AirlinesUA2823 + TP202 / UA943$1063.752026-10-29T01:07:18Z
2026-12-28 → 2027-01-03United AirlinesUA260 + TP1011 / UA943$1063.752026-10-29T01:07:18Z
2026-12-28 → 2027-01-03United AirlinesUA918 + TP1351 / UA943$1063.752026-10-29T01:07:18Z
2026-12-28 → 2027-01-03United AirlinesUA688 + TP216 / UA943$1063.752026-10-29T01:07:18Z
2026-12-28 → 2027-01-03United AirlinesUA3453 + AC810 / UA943$1063.752026-10-29T01:07:18Z

2026-12-28 → 2027-01-03 · $946.80

  • TAP Air Portugal TP234: IAD 2026-12-28 22:30:00 → LIS 2026-12-29 10:40:00; nonstop; 430 minutes. Local airport times.
  • TAP Air Portugal TP233: LIS 2027-01-03 16:45:00 → IAD 2027-01-03 20:35:00; nonstop; 530 minutes. Local airport times.

2026-12-28 → 2027-01-03 · $1117.75

  • United Airlines UA942: IAD 2026-12-28 22:30:00 → LIS 2026-12-29 10:20:00; nonstop; 410 minutes. Local airport times.
  • United Airlines UA943: LIS 2027-01-03 12:20:00 → IAD 2027-01-03 15:40:00; nonstop; 500 minutes. Local airport times.

2026-12-28 → 2027-01-03 · $973.10

  • Air Canada AC8619 / AC810: IAD 2026-12-28 16:30:00 → LIS 2026-12-29 08:55:00; 1 stop(s) via YYZ; 685 minutes. Local airport times.
    • AC8619: IAD 2026-12-28 16:30:00 → YYZ 2026-12-28 17:57:00; layover at YYZ: 168 minutes.
    • AC810: YYZ 2026-12-28 20:45:00 → LIS 2026-12-29 08:55:00.
  • Air Canada AC813 / AC8725: LIS 2027-01-03 12:50:00 → IAD 2027-01-03 20:23:00; 1 stop(s) via YUL; 753 minutes. Local airport times.
    • AC813: LIS 2027-01-03 12:50:00 → YUL 2027-01-03 15:55:00; layover at YUL: 150 minutes.
    • AC8725: YUL 2027-01-03 18:25:00 → IAD 2027-01-03 20:23:00.

2026-12-28 → 2027-01-03 · $946.80

  • TAP Air Portugal TP232: IAD 2026-12-28 17:25:00 → LIS 2026-12-29 05:35:00; nonstop; 430 minutes. Local airport times.
  • TAP Air Portugal TP233: LIS 2027-01-03 16:45:00 → IAD 2027-01-03 20:35:00; nonstop; 530 minutes. Local airport times.

2026-12-28 → 2027-01-03 · $1063.75

  • United Airlines UA2823 / TP202: IAD 2026-12-28 12:38:00 → LIS 2026-12-29 05:25:00; 1 stop(s) via EWR; 707 minutes. Local airport times.
    • UA2823: IAD 2026-12-28 12:38:00 → EWR 2026-12-28 13:59:00; layover at EWR: 221 minutes.
    • TP202: EWR 2026-12-28 17:40:00 → LIS 2026-12-29 05:25:00.
  • United Airlines UA943: LIS 2027-01-03 12:20:00 → IAD 2027-01-03 15:40:00; nonstop; 500 minutes. Local airport times.

2026-12-28 → 2027-01-03 · $1063.75

  • United Airlines UA260 / TP1011: IAD 2026-12-28 18:10:00 → LIS 2026-12-29 10:45:00; 1 stop(s) via MAD; 695 minutes. Local airport times.
    • UA260: IAD 2026-12-28 18:10:00 → MAD 2026-12-29 07:45:00; layover at MAD: 155 minutes.
    • TP1011: MAD 2026-12-29 10:20:00 → LIS 2026-12-29 10:45:00.
  • United Airlines UA943: LIS 2027-01-03 12:20:00 → IAD 2027-01-03 15:40:00; nonstop; 500 minutes. Local airport times.

2026-12-28 → 2027-01-03 · $1063.75

  • United Airlines UA918 / TP1351: IAD 2026-12-28 18:20:00 → LIS 2026-12-29 11:05:00; 1 stop(s) via LHR; 705 minutes. Local airport times.
    • UA918: IAD 2026-12-28 18:20:00 → LHR 2026-12-29 06:40:00; layover at LHR: 95 minutes.
    • TP1351: LHR 2026-12-29 08:15:00 → LIS 2026-12-29 11:05:00.
  • United Airlines UA943: LIS 2027-01-03 12:20:00 → IAD 2027-01-03 15:40:00; nonstop; 500 minutes. Local airport times.

2026-12-28 → 2027-01-03 · $1063.75

  • United Airlines UA688 / TP216: IAD 2026-12-28 17:15:00 → LIS 2026-12-29 09:45:00; 1 stop(s) via BOS; 690 minutes. Local airport times.
    • UA688: IAD 2026-12-28 17:15:00 → BOS 2026-12-28 18:57:00; layover at BOS: 193 minutes.
    • TP216: BOS 2026-12-28 22:10:00 → LIS 2026-12-29 09:45:00.
  • United Airlines UA943: LIS 2027-01-03 12:20:00 → IAD 2027-01-03 15:40:00; nonstop; 500 minutes. Local airport times.

2026-12-28 → 2027-01-03 · $1063.75

  • United Airlines UA3453 / AC810: IAD 2026-12-28 17:18:00 → LIS 2026-12-29 08:55:00; 1 stop(s) via YYZ; 637 minutes. Local airport times.
    • UA3453: IAD 2026-12-28 17:18:00 → YYZ 2026-12-28 19:01:00; layover at YYZ: 104 minutes.
    • AC810: YYZ 2026-12-28 20:45:00 → LIS 2026-12-29 08:55:00.
  • United Airlines UA943: LIS 2027-01-03 12:20:00 → IAD 2027-01-03 15:40:00; nonstop; 500 minutes. Local airport times.

More dates for this route